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1. Expanded phenotypic spectrum of neurodevelopmental and neurodegenerative disorder Bryant-Li-Bhoj syndrome with 38 additional individuals

Author

Layo-Carris, DE, Lubin, EE, Sangree, AK, Clark, KJ, Durham, EL, Gonzalez, EM, Smith, S, Angireddy, R, Wang, XM, Weiss, E, Mendoza-Londono, R, Dupuis, L, Damseh, N, Velasco, D, Valenzuela, I, Codina-Sola, M, Ziats, C, Have, J, Clarkson, K, Steel, D, Kurian, M, Barwick, K, Carrasco, D, Dagli, AI, Nowaczyk, MJM, Hancarova, M, Bendova, S, Prchalova, D, Sedlacek, Z, Baxova, A, Nowak, CB, Douglas, J, Chung, WK, Longo, N, Platzer, K, Kloeckner, C, Averdunk, L, Wieczorek, D, Krey, I, Zweier, C, Reis, A, Balci, T, Simon, M, Kroes, HY, Wiesener, A, Vasileiou, G, Marinakis, NM, Veltra, D, Sofocleous, C, Kosma, K, Synodinos, JT, Voudris, KA, Vuillaume, M-L, Gueguen, P, Derive, N, Colin, E, Battault, C, Au, B, Delatycki, M, Wallis, M, Gallacher, L, Majdoub, F, Smal, N, Weckhuysen, S, Schoonjans, A-S, Kooy, RF, Meuwissen, M, Cocanougher, BT, Taylor, K, Pizoli, CE, McDonald, MT, James, P, Roeder, ER, Littlejohn, R, Borja, NA, Thorson, W, King, K, Stoeva, R, Suerink, M, Nibbeling, E, Baskin, S, Guyader, GLE, Kaplan, J, Muss, C, Carere, DA, Bhoj, EJK, Bryant, LM, Layo-Carris, DE, Lubin, EE, Sangree, AK, Clark, KJ, Durham, EL, Gonzalez, EM, Smith, S, Angireddy, R, Wang, XM, Weiss, E, Mendoza-Londono, R, Dupuis, L, Damseh, N, Velasco, D, Valenzuela, I, Codina-Sola, M, Ziats, C, Have, J, Clarkson, K, Steel, D, Kurian, M, Barwick, K, Carrasco, D, Dagli, AI, Nowaczyk, MJM, Hancarova, M, Bendova, S, Prchalova, D, Sedlacek, Z, Baxova, A, Nowak, CB, Douglas, J, Chung, WK, Longo, N, Platzer, K, Kloeckner, C, Averdunk, L, Wieczorek, D, Krey, I, Zweier, C, Reis, A, Balci, T, Simon, M, Kroes, HY, Wiesener, A, Vasileiou, G, Marinakis, NM, Veltra, D, Sofocleous, C, Kosma, K, Synodinos, JT, Voudris, KA, Vuillaume, M-L, Gueguen, P, Derive, N, Colin, E, Battault, C, Au, B, Delatycki, M, Wallis, M, Gallacher, L, Majdoub, F, Smal, N, Weckhuysen, S, Schoonjans, A-S, Kooy, RF, Meuwissen, M, Cocanougher, BT, Taylor, K, Pizoli, CE, McDonald, MT, James, P, Roeder, ER, Littlejohn, R, Borja, NA, Thorson, W, King, K, Stoeva, R, Suerink, M, Nibbeling, E, Baskin, S, Guyader, GLE, Kaplan, J, Muss, C, Carere, DA, Bhoj, EJK, and Bryant, LM

Abstract

Bryant-Li-Bhoj syndrome (BLBS), which became OMIM-classified in 2022 (OMIM: 619720, 619721), is caused by germline variants in the two genes that encode histone H3.3 (H3-3A/H3F3A and H3-3B/H3F3B) [1-4]. This syndrome is characterized by developmental delay/intellectual disability, craniofacial anomalies, hyper/hypotonia, and abnormal neuroimaging [1, 5]. BLBS was initially categorized as a progressive neurodegenerative syndrome caused by de novo heterozygous variants in either H3-3A or H3-3B [1-4]. Here, we analyze the data of the 58 previously published individuals along 38 unpublished, unrelated individuals. In this larger cohort of 96 people, we identify causative missense, synonymous, and stop-loss variants. We also expand upon the phenotypic characterization by elaborating on the neurodevelopmental component of BLBS. Notably, phenotypic heterogeneity was present even amongst individuals harboring the same variant. To explore the complex phenotypic variation in this expanded cohort, the relationships between syndromic phenotypes with three variables of interest were interrogated: sex, gene containing the causative variant, and variant location in the H3.3 protein. While specific genotype-phenotype correlations have not been conclusively delineated, the results presented here suggest that the location of the variants within the H3.3 protein and the affected gene (H3-3A or H3-3B) contribute more to the severity of distinct phenotypes than sex. Since these variables do not account for all BLBS phenotypic variability, these findings suggest that additional factors may play a role in modifying the phenotypes of affected individuals. Histones are poised at the interface of genetics and epigenetics, highlighting the potential role for gene-environment interactions and the importance of future research.

Published
2024

2. Correction: Expanded phenotypic spectrum of neurodevelopmental and neurodegenerative disorder Bryant-Li-Bhoj syndrome with 38 additional individuals (vol 3, 2024, 59)

Author

Layo-Carris, DE, Lubin, EE, Sangree, AK, Clark, KJ, Durham, EL, Gonzalez, EM, Smith, S, Angireddy, R, Wang, XM, Weiss, E, Toutain, A, Mendoza-Londono, R, Dupuis, L, Damseh, N, Velasco, D, Valenzuela, I, Codina-Sola, M, Ziats, C, Have, J, Clarkson, K, Steel, D, Kurian, M, Barwick, K, Carrasco, D, Dagli, AI, Nowaczyk, MJM, Hancarova, M, Bendova, S, Prchalova, D, Sedlacek, Z, Baxova, A, Nowak, CB, Douglas, J, Chung, WK, Longo, N, Platzer, K, Klockner, C, Averdunk, L, Wieczorek, D, Krey, I, Zweier, C, Reis, A, Balci, T, Simon, M, Kroes, HY, Wiesener, A, Vasileiou, G, Marinakis, NM, Veltra, D, Sofocleous, C, Kosma, K, Synodinos, JT, Voudris, KA, Vuillaume, M-L, Gueguen, P, Derive, N, Colin, E, Battault, C, Au, B, Delatycki, M, Wallis, M, Gallacher, L, Majdoub, F, Smal, N, Weckhuysen, S, Schoonjans, A-S, Kooy, RF, Meuwissen, M, Cocanougher, BT, Taylor, K, Pizoli, CE, Mcdonald, MT, James, P, Roeder, ER, Littlejohn, R, Borja, NA, Thorson, W, King, K, Stoeva, R, Suerink, M, Nibbeling, E, Baskin, S, Guyader, GLE, Kaplan, J, Muss, C, Carere, DA, Bhoj, EJK, Bryant, LM, Layo-Carris, DE, Lubin, EE, Sangree, AK, Clark, KJ, Durham, EL, Gonzalez, EM, Smith, S, Angireddy, R, Wang, XM, Weiss, E, Toutain, A, Mendoza-Londono, R, Dupuis, L, Damseh, N, Velasco, D, Valenzuela, I, Codina-Sola, M, Ziats, C, Have, J, Clarkson, K, Steel, D, Kurian, M, Barwick, K, Carrasco, D, Dagli, AI, Nowaczyk, MJM, Hancarova, M, Bendova, S, Prchalova, D, Sedlacek, Z, Baxova, A, Nowak, CB, Douglas, J, Chung, WK, Longo, N, Platzer, K, Klockner, C, Averdunk, L, Wieczorek, D, Krey, I, Zweier, C, Reis, A, Balci, T, Simon, M, Kroes, HY, Wiesener, A, Vasileiou, G, Marinakis, NM, Veltra, D, Sofocleous, C, Kosma, K, Synodinos, JT, Voudris, KA, Vuillaume, M-L, Gueguen, P, Derive, N, Colin, E, Battault, C, Au, B, Delatycki, M, Wallis, M, Gallacher, L, Majdoub, F, Smal, N, Weckhuysen, S, Schoonjans, A-S, Kooy, RF, Meuwissen, M, Cocanougher, BT, Taylor, K, Pizoli, CE, Mcdonald, MT, James, P, Roeder, ER, Littlejohn, R, Borja, NA, Thorson, W, King, K, Stoeva, R, Suerink, M, Nibbeling, E, Baskin, S, Guyader, GLE, Kaplan, J, Muss, C, Carere, DA, Bhoj, EJK, and Bryant, LM

Published
2024

4. Large scale multifactorial likelihood quantitative analysis of BRCA1 and BRCA2 variants: An ENIGMA resource to support clinical variant classification.

Author

Feroce I., Schoenwiese U., Seggewiss J., Solanes A., Steinemann D., Stiller M., Stoppa-Lyonnet D., Sullivan K.J., Susman R., Sutter C., Tavtigian S.V., Teo S.H., Teule A., Thomassen M., Tibiletti M.G., Tischkowitz M., Tognazzo S., Toland A.E., Tornero E., Torngren T., Torres-Esquius S., Toss A., Trainer A.H., Tucker K.M., van Asperen C.J., van Mackelenbergh M.T., Varesco L., Vargas-Parra G., Varon R., Vega A., Velasco A., Vesper A.-S., Viel A., Vreeswijk M.P.G., Wagner S.A., Waha A., Walker L.C., Walters R.J., Wang-Gohrke S., Weber B.H.F., Weichert W., Wieland K., Wiesmuller L., Witzel I., Wockel A., Woodward E.R., Zachariae S., Zampiga V., Zeder-Goss C., Investigators K., Lazaro C., De Nicolo A., Radice P., Engel C., Schmutzler R.K., Goldgar D.E., Spurdle A.B., Harris M., Parsons M.T., Tudini E., Li H., Hahnen E., Wappenschmidt B., Feliubadalo L., Aalfs C.M., Agata S., Aittomaki K., Alducci E., Alonso-Cerezo M.C., Arnold N., Auber B., Austin R., Azzollini J., Balmana J., Barbieri E., Bartram C.R., Blanco A., Blumcke B., Bonache S., Bonanni B., Borg A., Bortesi B., Brunet J., Bruzzone C., Bucksch K., Cagnoli G., Caldes T., Caliebe A., Caligo M.A., Calvello M., Capone G.L., Caputo S.M., Carnevali I., Carrasco E., Caux-Moncoutier V., Cavalli P., Cini G., Clarke E.M., Concolino P., Cops E.J., Cortesi L., Couch F.J., Darder E., de la Hoya M., Dean M., Debatin I., Del Valle J., Delnatte C., Derive N., Diez O., Ditsch N., Domchek S.M., Dutrannoy V., Eccles D.M., Ehrencrona H., Enders U., Evans D.G., Farra C., Faust U., Felbor U., Fine M., Foulkes W.D., Galvao H.C.R., Gambino G., Gehrig A., Gensini F., Gerdes A.-M., Germani A., Giesecke J., Gismondi V., Gomez C., Gomez Garcia E.B., Gonzalez S., Grau E., Grill S., Gross E., Guerrieri-Gonzaga A., Guillaud-Bataille M., Gutierrez-Enriquez S., Haaf T., Hackmann K., Hansen T.V.O., Hauke J., Heinrich T., Hellebrand H., Herold K.N., Honisch E., Horvath J., Houdayer C., Hubbel V., Iglesias S., Izquierdo A., James P.A., Janssen L.A.M., Jeschke U., Kaulfuss S., Keupp K., Kiechle M., Kolbl A., Krieger S., Kruse T.A., Kvist A., Lalloo F., Larsen M., Lattimore V.L., Lautrup C., Ledig S., Leinert E., Lewis A.L., Lim J., Loeffler M., Lopez-Fernandez A., Lucci-Cordisco E., Maass N., Manoukian S., Marabelli M., Matricardi L., Meindl A., Michelli R.D., Moghadasi S., Moles-Fernandez A., Montagna M., Montalban G., Monteiro A.N., Montes E., Mori L., Moserle L., Muller C.R., Mundhenke C., Naldi N., Nathanson K.L., Navarro M., Nevanlinna H., Nichols C.B., Niederacher D., Nielsen H.R., Ong K.-R., Pachter N., Palmero E.I., Papi L., Pedersen I.S., Peissel B., Perez-Segura P., Pfeifer K., Pineda M., Pohl-Rescigno E., Poplawski N.K., Porfirio B., Quante A.S., Ramser J., Reis R.M., Revillion F., Rhiem K., Riboli B., Ritter J., Rivera D., Rofes P., Rump A., Salinas M., Sanchez de Abajo A.M., Schmidt G., Feroce I., Schoenwiese U., Seggewiss J., Solanes A., Steinemann D., Stiller M., Stoppa-Lyonnet D., Sullivan K.J., Susman R., Sutter C., Tavtigian S.V., Teo S.H., Teule A., Thomassen M., Tibiletti M.G., Tischkowitz M., Tognazzo S., Toland A.E., Tornero E., Torngren T., Torres-Esquius S., Toss A., Trainer A.H., Tucker K.M., van Asperen C.J., van Mackelenbergh M.T., Varesco L., Vargas-Parra G., Varon R., Vega A., Velasco A., Vesper A.-S., Viel A., Vreeswijk M.P.G., Wagner S.A., Waha A., Walker L.C., Walters R.J., Wang-Gohrke S., Weber B.H.F., Weichert W., Wieland K., Wiesmuller L., Witzel I., Wockel A., Woodward E.R., Zachariae S., Zampiga V., Zeder-Goss C., Investigators K., Lazaro C., De Nicolo A., Radice P., Engel C., Schmutzler R.K., Goldgar D.E., Spurdle A.B., Harris M., Parsons M.T., Tudini E., Li H., Hahnen E., Wappenschmidt B., Feliubadalo L., Aalfs C.M., Agata S., Aittomaki K., Alducci E., Alonso-Cerezo M.C., Arnold N., Auber B., Austin R., Azzollini J., Balmana J., Barbieri E., Bartram C.R., Blanco A., Blumcke B., Bonache S., Bonanni B., Borg A., Bortesi B., Brunet J., Bruzzone C., Bucksch K., Cagnoli G., Caldes T., Caliebe A., Caligo M.A., Calvello M., Capone G.L., Caputo S.M., Carnevali I., Carrasco E., Caux-Moncoutier V., Cavalli P., Cini G., Clarke E.M., Concolino P., Cops E.J., Cortesi L., Couch F.J., Darder E., de la Hoya M., Dean M., Debatin I., Del Valle J., Delnatte C., Derive N., Diez O., Ditsch N., Domchek S.M., Dutrannoy V., Eccles D.M., Ehrencrona H., Enders U., Evans D.G., Farra C., Faust U., Felbor U., Fine M., Foulkes W.D., Galvao H.C.R., Gambino G., Gehrig A., Gensini F., Gerdes A.-M., Germani A., Giesecke J., Gismondi V., Gomez C., Gomez Garcia E.B., Gonzalez S., Grau E., Grill S., Gross E., Guerrieri-Gonzaga A., Guillaud-Bataille M., Gutierrez-Enriquez S., Haaf T., Hackmann K., Hansen T.V.O., Hauke J., Heinrich T., Hellebrand H., Herold K.N., Honisch E., Horvath J., Houdayer C., Hubbel V., Iglesias S., Izquierdo A., James P.A., Janssen L.A.M., Jeschke U., Kaulfuss S., Keupp K., Kiechle M., Kolbl A., Krieger S., Kruse T.A., Kvist A., Lalloo F., Larsen M., Lattimore V.L., Lautrup C., Ledig S., Leinert E., Lewis A.L., Lim J., Loeffler M., Lopez-Fernandez A., Lucci-Cordisco E., Maass N., Manoukian S., Marabelli M., Matricardi L., Meindl A., Michelli R.D., Moghadasi S., Moles-Fernandez A., Montagna M., Montalban G., Monteiro A.N., Montes E., Mori L., Moserle L., Muller C.R., Mundhenke C., Naldi N., Nathanson K.L., Navarro M., Nevanlinna H., Nichols C.B., Niederacher D., Nielsen H.R., Ong K.-R., Pachter N., Palmero E.I., Papi L., Pedersen I.S., Peissel B., Perez-Segura P., Pfeifer K., Pineda M., Pohl-Rescigno E., Poplawski N.K., Porfirio B., Quante A.S., Ramser J., Reis R.M., Revillion F., Rhiem K., Riboli B., Ritter J., Rivera D., Rofes P., Rump A., Salinas M., Sanchez de Abajo A.M., and Schmidt G.

Abstract

The multifactorial likelihood analysis method has demonstrated utility for quantitative assessment of variant pathogenicity for multiple cancer syndrome genes. Independent data types currently incorporated in the model for assessing BRCA1 and BRCA2 variants include clinically calibrated prior probability of pathogenicity based on variant location and bioinformatic prediction of variant effect, co-segregation, family cancer history profile, co-occurrence with a pathogenic variant in the same gene, breast tumor pathology, and case-control information. Research and clinical data for multifactorial likelihood analysis were collated for 1,395 BRCA1/2 predominantly intronic and missense variants, enabling classification based on posterior probability of pathogenicity for 734 variants: 447 variants were classified as (likely) benign, and 94 as (likely) pathogenic; and 248 classifications were new or considerably altered relative to ClinVar submissions. Classifications were compared with information not yet included in the likelihood model, and evidence strengths aligned to those recommended for ACMG/AMP classification codes. Altered mRNA splicing or function relative to known nonpathogenic variant controls were moderately to strongly predictive of variant pathogenicity. Variant absence in population datasets provided supporting evidence for variant pathogenicity. These findings have direct relevance for BRCA1 and BRCA2 variant evaluation, and justify the need for gene-specific calibration of evidence types used for variant classification.Copyright © 2019 Wiley Periodicals, Inc.

Published
2019

5. Large scale multifactorial likelihood quantitative analysis of BRCA1 and BRCA2 variants: An ENIGMA resource to support clinical variant classification

Author

Parsons, MT, Tudini, E, Li, H, Hahnen, E, Wappenschmidt, B, Feliubadalo, L, Aalfs, CM, Agata, S, Aittomaki, K, Alducci, E, Concepcion Alonso-Cerezo, M, Arnold, N, Auber, B, Austin, R, Azzollini, J, Balmana, J, Barbieri, E, Bartram, CR, Blanco, A, Bluemcke, B, Bonache, S, Bonanni, B, Borg, A, Bortesi, B, Brunet, J, Bruzzone, C, Bucksch, K, Cagnoli, G, Caldes, T, Caliebe, A, Caligo, MA, Calvello, M, Capone, GL, Caputo, SM, Carnevali, I, Carrasco, E, Caux-Moncoutier, V, Cavalli, P, Cini, G, Clarke, EM, Concolino, P, Cops, EJ, Cortesi, L, Couch, FJ, Darder, E, de la Hoya, M, Dean, M, Debatin, I, Del Valle, J, Delnatte, C, Derive, N, Diez, O, Ditsch, N, Domchek, SM, Dutrannoy, V, Eccles, DM, Ehrencrona, H, Enders, U, Evans, DG, Farra, C, Faust, U, Felbor, U, Feroce, I, Fine, M, Foulkes, WD, Galvao, HC, Gambino, G, Gehrig, A, Gensini, F, Gerdes, A-M, Germani, A, Giesecke, J, Gismondi, V, Gomez, C, Garcia, EBG, Gonzalez, S, Grau, E, Grill, S, Gross, E, Guerrieri-Gonzaga, A, Guillaud-Bataille, M, Gutierrez-Enriquez, S, Haaf, T, Hackmann, K, Hansen, TV, Harris, M, Hauke, J, Heinrich, T, Hellebrand, H, Herold, KN, Honisch, E, Horvath, J, Houdayer, C, Huebbel, V, Iglesias, S, Izquierdo, A, James, PA, Janssen, LA, Jeschke, U, Kaulfuss, S, Keupp, K, Kiechle, M, Koelbl, A, Krieger, S, Kruse, TA, Kvist, A, Lalloo, F, Larsen, M, Lattimore, VL, Lautrup, C, Ledig, S, Leinert, E, Lewis, AL, Lim, J, Loeffler, M, Lopez-Fernandez, A, Lucci-Cordisco, E, Maass, N, Manoukian, S, Marabelli, M, Matricardi, L, Meindl, A, Michelli, RD, Moghadasi, S, Moles-Fernandez, A, Montagna, M, Montalban, G, Monteiro, AN, Montes, E, Mori, L, Moserle, L, Mueller, CR, Mundhenke, C, Naldi, N, Nathanson, KL, Navarro, M, Nevanlinna, H, Nichols, CB, Niederacher, D, Nielsen, HR, Ong, K-R, Pachter, N, Palmero, E, Papi, L, Pedersen, IS, Peissel, B, Perez-Segura, P, Pfeifer, K, Pineda, M, Pohl-Rescigno, E, Poplawski, NK, Porfirio, B, Quante, AS, Ramser, J, Reis, RM, Revillion, F, Rhiem, K, Riboli, B, Ritter, J, Rivera, D, Rofes, P, Rump, A, Salinas, M, Sanchez de Abajo, AM, Schmidt, G, Schoenwiese, U, Seggewiss, J, Solanes, A, Steinemann, D, Stiller, M, Stoppa-Lyonnet, D, Sullivan, KJ, Susman, R, Sutter, C, Tavtigian, S, Teo, SH, Teule, A, Thomassen, M, Tibiletti, MG, Tischkowitz, M, Tognazzo, S, Toland, AE, Tornero, E, Torngren, T, Torres-Esquius, S, Toss, A, Trainer, AH, Tucker, KM, van Asperen, CJ, van Mackelenbergh, MT, Varesco, L, Vargas-Parra, G, Varon, R, Vega, A, Velasco, A, Vesper, A-S, Viel, A, Vreeswijk, MPG, Wagner, SA, Waha, A, Walker, LC, Walters, RJ, Wang-Gohrke, S, Weber, BHF, Weichert, W, Wieland, K, Wiesmueller, L, Witzel, I, Woeckel, A, Woodward, ER, Zachariae, S, Zampiga, V, Zeder-Goss, C, Lazaro, C, De Nicolo, A, Radice, P, Engel, C, Schmutzler, RK, Goldgar, DE, Spurdle, AB, Parsons, MT, Tudini, E, Li, H, Hahnen, E, Wappenschmidt, B, Feliubadalo, L, Aalfs, CM, Agata, S, Aittomaki, K, Alducci, E, Concepcion Alonso-Cerezo, M, Arnold, N, Auber, B, Austin, R, Azzollini, J, Balmana, J, Barbieri, E, Bartram, CR, Blanco, A, Bluemcke, B, Bonache, S, Bonanni, B, Borg, A, Bortesi, B, Brunet, J, Bruzzone, C, Bucksch, K, Cagnoli, G, Caldes, T, Caliebe, A, Caligo, MA, Calvello, M, Capone, GL, Caputo, SM, Carnevali, I, Carrasco, E, Caux-Moncoutier, V, Cavalli, P, Cini, G, Clarke, EM, Concolino, P, Cops, EJ, Cortesi, L, Couch, FJ, Darder, E, de la Hoya, M, Dean, M, Debatin, I, Del Valle, J, Delnatte, C, Derive, N, Diez, O, Ditsch, N, Domchek, SM, Dutrannoy, V, Eccles, DM, Ehrencrona, H, Enders, U, Evans, DG, Farra, C, Faust, U, Felbor, U, Feroce, I, Fine, M, Foulkes, WD, Galvao, HC, Gambino, G, Gehrig, A, Gensini, F, Gerdes, A-M, Germani, A, Giesecke, J, Gismondi, V, Gomez, C, Garcia, EBG, Gonzalez, S, Grau, E, Grill, S, Gross, E, Guerrieri-Gonzaga, A, Guillaud-Bataille, M, Gutierrez-Enriquez, S, Haaf, T, Hackmann, K, Hansen, TV, Harris, M, Hauke, J, Heinrich, T, Hellebrand, H, Herold, KN, Honisch, E, Horvath, J, Houdayer, C, Huebbel, V, Iglesias, S, Izquierdo, A, James, PA, Janssen, LA, Jeschke, U, Kaulfuss, S, Keupp, K, Kiechle, M, Koelbl, A, Krieger, S, Kruse, TA, Kvist, A, Lalloo, F, Larsen, M, Lattimore, VL, Lautrup, C, Ledig, S, Leinert, E, Lewis, AL, Lim, J, Loeffler, M, Lopez-Fernandez, A, Lucci-Cordisco, E, Maass, N, Manoukian, S, Marabelli, M, Matricardi, L, Meindl, A, Michelli, RD, Moghadasi, S, Moles-Fernandez, A, Montagna, M, Montalban, G, Monteiro, AN, Montes, E, Mori, L, Moserle, L, Mueller, CR, Mundhenke, C, Naldi, N, Nathanson, KL, Navarro, M, Nevanlinna, H, Nichols, CB, Niederacher, D, Nielsen, HR, Ong, K-R, Pachter, N, Palmero, E, Papi, L, Pedersen, IS, Peissel, B, Perez-Segura, P, Pfeifer, K, Pineda, M, Pohl-Rescigno, E, Poplawski, NK, Porfirio, B, Quante, AS, Ramser, J, Reis, RM, Revillion, F, Rhiem, K, Riboli, B, Ritter, J, Rivera, D, Rofes, P, Rump, A, Salinas, M, Sanchez de Abajo, AM, Schmidt, G, Schoenwiese, U, Seggewiss, J, Solanes, A, Steinemann, D, Stiller, M, Stoppa-Lyonnet, D, Sullivan, KJ, Susman, R, Sutter, C, Tavtigian, S, Teo, SH, Teule, A, Thomassen, M, Tibiletti, MG, Tischkowitz, M, Tognazzo, S, Toland, AE, Tornero, E, Torngren, T, Torres-Esquius, S, Toss, A, Trainer, AH, Tucker, KM, van Asperen, CJ, van Mackelenbergh, MT, Varesco, L, Vargas-Parra, G, Varon, R, Vega, A, Velasco, A, Vesper, A-S, Viel, A, Vreeswijk, MPG, Wagner, SA, Waha, A, Walker, LC, Walters, RJ, Wang-Gohrke, S, Weber, BHF, Weichert, W, Wieland, K, Wiesmueller, L, Witzel, I, Woeckel, A, Woodward, ER, Zachariae, S, Zampiga, V, Zeder-Goss, C, Lazaro, C, De Nicolo, A, Radice, P, Engel, C, Schmutzler, RK, Goldgar, DE, and Spurdle, AB

Abstract

The multifactorial likelihood analysis method has demonstrated utility for quantitative assessment of variant pathogenicity for multiple cancer syndrome genes. Independent data types currently incorporated in the model for assessing BRCA1 and BRCA2 variants include clinically calibrated prior probability of pathogenicity based on variant location and bioinformatic prediction of variant effect, co-segregation, family cancer history profile, co-occurrence with a pathogenic variant in the same gene, breast tumor pathology, and case-control information. Research and clinical data for multifactorial likelihood analysis were collated for 1,395 BRCA1/2 predominantly intronic and missense variants, enabling classification based on posterior probability of pathogenicity for 734 variants: 447 variants were classified as (likely) benign, and 94 as (likely) pathogenic; and 248 classifications were new or considerably altered relative to ClinVar submissions. Classifications were compared with information not yet included in the likelihood model, and evidence strengths aligned to those recommended for ACMG/AMP classification codes. Altered mRNA splicing or function relative to known nonpathogenic variant controls were moderately to strongly predictive of variant pathogenicity. Variant absence in population datasets provided supporting evidence for variant pathogenicity. These findings have direct relevance for BRCA1 and BRCA2 variant evaluation, and justify the need for gene-specific calibration of evidence types used for variant classification.

Published
2019

6. Large scale multifactorial likelihood quantitative analysis of BRCA1 and BRCA2 variants: An ENIGMA resource to support clinical variant classification

Author

Parsons, M. T., Tudini, E., Li, H., Hahnen, E., Wappenschmidt, B., Feliubadalo, L., Aalfs, C. M., Agata, S., Aittomaki, K., Alducci, E., Alonso-Cerezo, M. C., Arnold, N., Auber, B., Austin, R., Azzollini, J., Balmana, J., Barbieri, E., Bartram, C. R., Blanco, A., Blumcke, B., Bonache, S., Bonanni, B., Borg, A., Bortesi, B., Brunet, J., Bruzzone, C., Bucksch, K., Cagnoli, G., Caldes, T., Caliebe, A., Caligo, M. A., Calvello, M., Capone, G. L., Caputo, S. M., Carnevali, I., Carrasco, E., Caux-Moncoutier, V., Cavalli, P., Cini, G., Clarke, E. M., Concolino, Paola, Cops, E. J., Cortesi, L., Couch, F. J., Darder, E., de la Hoya, M., Dean, M., Debatin, I., Del Valle, J., Delnatte, C., Derive, N., Diez, O., Ditsch, N., Domchek, S. M., Dutrannoy, V., Eccles, D. M., Ehrencrona, H., Enders, U., Evans, D. G., Farra, C., Faust, U., Felbor, U., Feroce, I., Fine, M., Foulkes, W. D., Galvao, H. C. R., Gambino, G., Gehrig, A., Gensini, F., Gerdes, A. -M., Germani, A., Giesecke, J., Gismondi, V., Gomez, C., Gomez Garcia, E. B., Gonzalez, S., Grau, E., Grill, S., Gross, E., Guerrieri-Gonzaga, A., Guillaud-Bataille, M., Gutierrez-Enriquez, S., Haaf, T., Hackmann, K., Hansen, T. V. O., Harris, M., Hauke, J., Heinrich, T., Hellebrand, H., Herold, K. N., Honisch, E., Horvath, J., Houdayer, C., Hubbel, V., Iglesias, S., Izquierdo, A., James, P. A., Janssen, L. A. M., Jeschke, U., Kaulfuss, S., Keupp, K., Kiechle, M., Kolbl, A., Krieger, S., Kruse, T. A., Kvist, A., Lalloo, F., Larsen, M., Lattimore, V. L., Lautrup, C., Ledig, S., Leinert, E., Lewis, A. L., Lim, J., Loeffler, M., Lopez-Fernandez, A., Lucci Cordisco, Emanuela, Maass, N., Manoukian, S., Marabelli, M., Matricardi, L., Meindl, A., Michelli, R. D., Moghadasi, S., Moles-Fernandez, A., Montagna, M., Montalban, G., Monteiro, A. N., Montes, E., Mori, L., Moserle, L., Muller, C. R., Mundhenke, C., Naldi, N., Nathanson, K. L., Navarro, M., Nevanlinna, H., Nichols, C. B., Niederacher, D., Nielsen, H. R., Ong, K. -R., Pachter, N., Palmero, E. I., Papi, L., Pedersen, I. S., Peissel, B., Perez-Segura, P., Pfeifer, K., Pineda, M., Pohl-Rescigno, E., Poplawski, N. K., Porfirio, B., Quante, A. S., Ramser, J., Reis, R. M., Revillion, F., Rhiem, K., Riboli, B., Ritter, J., Rivera, D., Rofes, P., Rump, A., Salinas, M., Sanchez de Abajo, A. M., Schmidt, G., Schoenwiese, U., Seggewiss, J., Solanes, A., Steinemann, D., Stiller, M., Stoppa-Lyonnet, D., Sullivan, K. J., Susman, R., Sutter, C., Tavtigian, S. V., Teo, S. H., Teule, A., Thomassen, M., Tibiletti, M. G., Tischkowitz, M., Tognazzo, S., Toland, A. E., Tornero, E., Torngren, T., Torres-Esquius, S., Toss, A., Trainer, A. H., Tucker, K. M., van Asperen, C. J., van Mackelenbergh, M. T., Varesco, L., Vargas-Parra, G., Varon, R., Vega, A., Velasco, A., Vesper, A. -S., Viel, A., Vreeswijk, M. P. G., Wagner, S. A., Waha, A., Walker, L. C., Walters, R. J., Wang-Gohrke, S., Weber, B. H. F., Weichert, W., Wieland, K., Wiesmuller, L., Witzel, I., Wockel, A., Woodward, E. R., Zachariae, S., Zampiga, V., Zeder-Goss, C., Investigators, K., Lazaro, C., De Nicolo, A., Radice, P., Engel, C., Schmutzler, R. K., Goldgar, D. E., Spurdle, A. B., Concolino P., Lucci Cordisco E. (ORCID:0000-0002-6279-7604), Parsons, M. T., Tudini, E., Li, H., Hahnen, E., Wappenschmidt, B., Feliubadalo, L., Aalfs, C. M., Agata, S., Aittomaki, K., Alducci, E., Alonso-Cerezo, M. C., Arnold, N., Auber, B., Austin, R., Azzollini, J., Balmana, J., Barbieri, E., Bartram, C. R., Blanco, A., Blumcke, B., Bonache, S., Bonanni, B., Borg, A., Bortesi, B., Brunet, J., Bruzzone, C., Bucksch, K., Cagnoli, G., Caldes, T., Caliebe, A., Caligo, M. A., Calvello, M., Capone, G. L., Caputo, S. M., Carnevali, I., Carrasco, E., Caux-Moncoutier, V., Cavalli, P., Cini, G., Clarke, E. M., Concolino, Paola, Cops, E. J., Cortesi, L., Couch, F. J., Darder, E., de la Hoya, M., Dean, M., Debatin, I., Del Valle, J., Delnatte, C., Derive, N., Diez, O., Ditsch, N., Domchek, S. M., Dutrannoy, V., Eccles, D. M., Ehrencrona, H., Enders, U., Evans, D. G., Farra, C., Faust, U., Felbor, U., Feroce, I., Fine, M., Foulkes, W. D., Galvao, H. C. R., Gambino, G., Gehrig, A., Gensini, F., Gerdes, A. -M., Germani, A., Giesecke, J., Gismondi, V., Gomez, C., Gomez Garcia, E. B., Gonzalez, S., Grau, E., Grill, S., Gross, E., Guerrieri-Gonzaga, A., Guillaud-Bataille, M., Gutierrez-Enriquez, S., Haaf, T., Hackmann, K., Hansen, T. V. O., Harris, M., Hauke, J., Heinrich, T., Hellebrand, H., Herold, K. N., Honisch, E., Horvath, J., Houdayer, C., Hubbel, V., Iglesias, S., Izquierdo, A., James, P. A., Janssen, L. A. M., Jeschke, U., Kaulfuss, S., Keupp, K., Kiechle, M., Kolbl, A., Krieger, S., Kruse, T. A., Kvist, A., Lalloo, F., Larsen, M., Lattimore, V. L., Lautrup, C., Ledig, S., Leinert, E., Lewis, A. L., Lim, J., Loeffler, M., Lopez-Fernandez, A., Lucci Cordisco, Emanuela, Maass, N., Manoukian, S., Marabelli, M., Matricardi, L., Meindl, A., Michelli, R. D., Moghadasi, S., Moles-Fernandez, A., Montagna, M., Montalban, G., Monteiro, A. N., Montes, E., Mori, L., Moserle, L., Muller, C. R., Mundhenke, C., Naldi, N., Nathanson, K. L., Navarro, M., Nevanlinna, H., Nichols, C. B., Niederacher, D., Nielsen, H. R., Ong, K. -R., Pachter, N., Palmero, E. I., Papi, L., Pedersen, I. S., Peissel, B., Perez-Segura, P., Pfeifer, K., Pineda, M., Pohl-Rescigno, E., Poplawski, N. K., Porfirio, B., Quante, A. S., Ramser, J., Reis, R. M., Revillion, F., Rhiem, K., Riboli, B., Ritter, J., Rivera, D., Rofes, P., Rump, A., Salinas, M., Sanchez de Abajo, A. M., Schmidt, G., Schoenwiese, U., Seggewiss, J., Solanes, A., Steinemann, D., Stiller, M., Stoppa-Lyonnet, D., Sullivan, K. J., Susman, R., Sutter, C., Tavtigian, S. V., Teo, S. H., Teule, A., Thomassen, M., Tibiletti, M. G., Tischkowitz, M., Tognazzo, S., Toland, A. E., Tornero, E., Torngren, T., Torres-Esquius, S., Toss, A., Trainer, A. H., Tucker, K. M., van Asperen, C. J., van Mackelenbergh, M. T., Varesco, L., Vargas-Parra, G., Varon, R., Vega, A., Velasco, A., Vesper, A. -S., Viel, A., Vreeswijk, M. P. G., Wagner, S. A., Waha, A., Walker, L. C., Walters, R. J., Wang-Gohrke, S., Weber, B. H. F., Weichert, W., Wieland, K., Wiesmuller, L., Witzel, I., Wockel, A., Woodward, E. R., Zachariae, S., Zampiga, V., Zeder-Goss, C., Investigators, K., Lazaro, C., De Nicolo, A., Radice, P., Engel, C., Schmutzler, R. K., Goldgar, D. E., Spurdle, A. B., Concolino P., and Lucci Cordisco E. (ORCID:0000-0002-6279-7604)

Abstract

The multifactorial likelihood analysis method has demonstrated utility for quantitative assessment of variant pathogenicity for multiple cancer syndrome genes. Independent data types currently incorporated in the model for assessing BRCA1 and BRCA2 variants include clinically calibrated prior probability of pathogenicity based on variant location and bioinformatic prediction of variant effect, co-segregation, family cancer history profile, co-occurrence with a pathogenic variant in the same gene, breast tumor pathology, and case-control information. Research and clinical data for multifactorial likelihood analysis were collated for 1,395 BRCA1/2 predominantly intronic and missense variants, enabling classification based on posterior probability of pathogenicity for 734 variants: 447 variants were classified as (likely) benign, and 94 as (likely) pathogenic; and 248 classifications were new or considerably altered relative to ClinVar submissions. Classifications were compared with information not yet included in the likelihood model, and evidence strengths aligned to those recommended for ACMG/AMP classification codes. Altered mRNA splicing or function relative to known nonpathogenic variant controls were moderately to strongly predictive of variant pathogenicity. Variant absence in population datasets provided supporting evidence for variant pathogenicity. These findings have direct relevance for BRCA1 and BRCA2 variant evaluation, and justify the need for gene-specific calibration of evidence types used for variant classification.

Published
2019

7. Heterozygous UBR5 variants result in a neurodevelopmental syndrome with developmental delay, autism, and intellectual disability.

Author

Sabeh P, Dumas SA, Maios C, Daghar H, Korzeniowski M, Rousseau J, Lines M, Guerin A, Millichap JJ, Landsverk M, Grebe T, Lindstrom K, Strober J, Ait Mouhoub T, Zweier C, Steinraths M, Hebebrand M, Callewaert B, Abou Jamra R, Kautza-Lucht M, Wegler M, Kruszka P, Kumps C, Banne E, Waberski MB, Dieux A, Raible S, Krantz I, Medne L, Pechter K, Villard L, Guerrini R, Bianchini C, Barba C, Mei D, Blanc X, Kallay C, Ranza E, Yang XR, O'Heir E, Donald KA, Murugasen S, Bruwer Z, Calikoglu M, Mathews JM, Lesieur-Sebellin M, Baujat G, Derive N, Pierson TM, Murrell JR, Shillington A, Ormieres C, Rondeau S, Reis A, Fernandez-Jaen A, Au PYB, Sweetser DA, Briere LC, Couque N, Perrin L, Schymick J, Gueguen P, Lefebvre M, Van Andel M, Juusola J, Antonarakis SE, Parker JA, Burnett BG, and Campeau PM

Subjects
Humans, Animals, Male, Female, Child, Child, Preschool, Ubiquitination, Adolescent, Phenotype, Infant, Adult, Ubiquitin-Protein Ligases genetics, Ubiquitin-Protein Ligases metabolism, Intellectual Disability genetics, Caenorhabditis elegans genetics, Developmental Disabilities genetics, Autistic Disorder genetics, Neurodevelopmental Disorders genetics, Heterozygote
Abstract

E3 ubiquitin ligases have been linked to developmental diseases including autism, Angelman syndrome (UBE3A), and Johanson-Blizzard syndrome (JBS) (UBR1). Here, we report variants in the E3 ligase UBR5 in 29 individuals presenting with a neurodevelopmental syndrome that includes developmental delay, autism, intellectual disability, epilepsy, movement disorders, and/or genital anomalies. Their phenotype is distinct from JBS due to the absence of exocrine pancreatic insufficiency and the presence of autism, epilepsy, and, in some probands, a movement disorder. E3 ubiquitin ligases are responsible for transferring ubiquitin to substrate proteins to regulate a variety of cellular functions, including protein degradation, protein-protein interactions, and protein localization. Knocking out ubr-5 in C. elegans resulted in a lower movement score compared to the wild type, supporting a role for UBR5 in neurodevelopment. Using an in vitro autoubiquitination assay and confocal microscopy for the human protein, we found decreased ubiquitination activity and altered cellular localization in several variants found in our cohort compared to the wild type. In conclusion, we found that variants in UBR5 cause a neurodevelopmental syndrome that can be associated with a movement disorder, reinforcing the role of the UBR protein family in a neurodevelopmental disease that differs from previously described ubiquitin-ligase-related syndromes. We also provide evidence for the pathogenic potential loss of UBR5 function with functional experiments in C. elegans and in vitro ubiquitination assays., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2024 American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.)

Published
2025
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8. Consolidating the Role of Mutated ATP2B2 in Neurodevelopmental and Cerebellar Pathologies.

Author

Stehr AM, Lenberg J, Friedman J, Dobbelaere D, Imbard A, Levy J, Donoghue S, Derive N, Stoeva R, Gueguen P, and Zech M

Subjects
Humans, Female, Male, Child, Child, Preschool, Cerebellum abnormalities, Cerebellum pathology, Cerebellum metabolism, Phenotype, Pedigree, Exome Sequencing, Adolescent, Animals, Intellectual Disability genetics, Intellectual Disability pathology, Mice, Genetic Predisposition to Disease, Plasma Membrane Calcium-Transporting ATPases genetics, Mutation, Neurodevelopmental Disorders genetics, Neurodevelopmental Disorders pathology
Abstract

Plasma membrane calcium ATPases (PMCAs) encoded by ATP2B genes have been implicated in Mendelian diseases with ataxia, dystonia, and intellectual disability. Work to date has shown that ATP2B2 (encoding PMCA2) is required for synaptic function and Purkinje-cell integrity in the cerebellum. A recent case series has linked ATP2B2 to a novel entity, characterized by neurodevelopmental and movement phenotypes, in only seven individuals. We called for collaboration to collect five unpublished families affected by the new rare ATP2B2-related condition. Exome-/genome sequencing-identified genotypes included four likely pathogenic/pathogenic heterozygous de novo missense variants and one dominantly inherited end-truncating frameshift allele. The six affected individuals shared features with the described patients including developmental delay, cognitive disturbances, epilepsy, autistic traits, and motor disorders. Striking cerebellar atrophy was observed in one affected individual. In association with hearing loss and movement abnormalities, we report a recurrent p.(Glu457Lys) substitution, previously documented in a neurologically impaired ATP2B2 mouse mutant. Our study further delineates the mutational spectrum and presentation of a human syndrome caused by ATP2B2 variants, confirming the importance of PMCA2 in neurotypical and cerebellar development., (© 2024 The Author(s). Clinical Genetics published by John Wiley & Sons Ltd.)

Published
2025
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9. Uniparental IsoDisomy: a case study on a new mechanism of Friedreich ataxia.

Author

Sperelakis-Beedham B, Gitiaux C, Rajaoba M, Magen M, Derive N, Chansard J, de Sainte Agathe JM, Maurin ML, Assouline Z, Barnerias C, Desguerre I, Steffann J, and Barcia G

Subjects
Humans, Female, Child, Friedreich Ataxia genetics, Friedreich Ataxia diagnosis, Uniparental Disomy genetics, Frataxin, Iron-Binding Proteins genetics
Abstract

Friedreich's Ataxia (FRDA) is the most common hereditary ataxia and is mainly caused by biallelic GAA repeat expansion in the FXN gene. Rare patients carrying FXN point mutations or intragenic deletions are reported. We describe the first FRDA patient with a chromosome 9 segmental Uniparental isoDisomy (UPiD) unmasking a homozygous FXN expansion initially undetected by TP-PCR. The child presented with a progressive proprioceptive ataxia associated with peripheral sensory neuronopathy and severe scoliosis. Whole genome sequencing (WGS) identified a maternal segmental Uniparental Isodisomy (UPiD) encompassing FXN. Short tandem repeats analysis on WGS showed a biallelic FXN expansion. The identification of a deletion in the primer-annealing region of the TP-PCR explained the initial TP-PCR failure. This is the first documented case of FRDA caused by segmental UPiD. This case highlights the complexity of the molecular diagnosis of FRDA, and emphasises the importance of integrating results from various technical diagnostic approaches., Competing Interests: Competing interests: The authors declare no competing interests. Ethics approval: We confirm that we have read the Journal’s position on issues involved in ethical publication and affirm that this report is consistent with those guidelines., (© 2024. The Author(s), under exclusive licence to European Society of Human Genetics.)

Published
2025
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10. An Update of Phenotypic-Genotypic IMNEPD Cases and a Bioinformatics Analysis of the New PTRH2 Gene Variants.

Author

Sharkia R, Vuillaume ML, Jain S, Mahajnah M, Stoeva R, Guichet A, Colin E, Champ J, Derive N, Chefdor A, and Zalan A

Subjects
Humans, Male, Female, Phenotype, Pancreatic Diseases genetics, Pancreatic Diseases pathology, Membrane Proteins genetics, Mutation, Infant, Genotype, Computational Biology methods
Abstract

Background/objectives: Biallelic mutations in the PTRH2 gene are associated with a rare genetic disease known as infantile-onset multisystem neurologic, endocrine, and pancreatic disease (IMNEPD). In this study, we describe a new case carrying a previously identified mutation, provide an updated analysis of the relative frequencies of the clinical features across all published cases (including the three latest studies), and perform a bioinformatics analysis of the newly identified PTRH2 protein variants from a structural perspective., Methods: Clinical examination of the patients was carried out, and genetic testing was performed using a genome sequencing strategy. A bioinformatics analysis was carried out for the newly reported mutations using PYMOL that was utilized to view the structure and analyze the mutations. Additionally, the ThermoMPNN webserver was employed to check the effect of point mutations on the overall stability of the protein., Results: Our findings indicate that motor delay, neuropathy, intellectual disability, distal weakness, hearing impairment, and ataxia are the most common symptoms, while the other clinical features fall into two frequency categories: moderately common ones and the least common ones. The bioinformatics analysis revealed that the Q85 residue is highly conserved, suggesting that mutations at this position could disrupt key signaling pathways or cellular functions. Indeed, the Q85R mutation was shown to significantly impair the stability and functionality of the protein., Conclusions: The clinical presentation of IMNEPD remains highly variable in terms of both severity and progression. Mutations at the Q85 residue have been identified in nearly 50% of reported cases, highlighting this position as a potential mutational hotspot in the PTRH2 protein.

Published
2024
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11. Expanded phenotypic spectrum of neurodevelopmental and neurodegenerative disorder Bryant-Li-Bhoj syndrome with 38 additional individuals.

Author

Layo-Carris DE, Lubin EE, Sangree AK, Clark KJ, Durham EL, Gonzalez EM, Smith S, Angireddy R, Wang XM, Weiss E, Toutain A, Mendoza-Londono R, Dupuis L, Damseh N, Velasco D, Valenzuela I, Codina-Solà M, Ziats C, Have J, Clarkson K, Steel D, Kurian M, Barwick K, Carrasco D, Dagli AI, Nowaczyk MJM, Hančárová M, Bendová Š, Prchalova D, Sedláček Z, Baxová A, Nowak CB, Douglas J, Chung WK, Longo N, Platzer K, Klöckner C, Averdunk L, Wieczorek D, Krey I, Zweier C, Reis A, Balci T, Simon M, Kroes HY, Wiesener A, Vasileiou G, Marinakis NM, Veltra D, Sofocleous C, Kosma K, Traeger Synodinos J, Voudris KA, Vuillaume ML, Gueguen P, Derive N, Colin E, Battault C, Au B, Delatycki M, Wallis M, Gallacher L, Majdoub F, Smal N, Weckhuysen S, Schoonjans AS, Kooy RF, Meuwissen M, Cocanougher BT, Taylor K, Pizoli CE, McDonald MT, James P, Roeder ER, Littlejohn R, Borja NA, Thorson W, King K, Stoeva R, Suerink M, Nibbeling E, Baskin S, L E Guyader G, Kaplan J, Muss C, Carere DA, Bhoj EJK, and Bryant LM

Subjects
Humans, Male, Female, Child, Neurodegenerative Diseases genetics, Neurodegenerative Diseases pathology, Neurodevelopmental Disorders genetics, Neurodevelopmental Disorders pathology, Child, Preschool, Adolescent, Adult, Intellectual Disability genetics, Intellectual Disability pathology, Phenotype, Histones genetics
Abstract

Bryant-Li-Bhoj syndrome (BLBS), which became OMIM-classified in 2022 (OMIM: 619720, 619721), is caused by germline variants in the two genes that encode histone H3.3 (H3-3A/H3F3A and H3-3B/H3F3B) [1-4]. This syndrome is characterized by developmental delay/intellectual disability, craniofacial anomalies, hyper/hypotonia, and abnormal neuroimaging [1, 5]. BLBS was initially categorized as a progressive neurodegenerative syndrome caused by de novo heterozygous variants in either H3-3A or H3-3B [1-4]. Here, we analyze the data of the 58 previously published individuals along 38 unpublished, unrelated individuals. In this larger cohort of 96 people, we identify causative missense, synonymous, and stop-loss variants. We also expand upon the phenotypic characterization by elaborating on the neurodevelopmental component of BLBS. Notably, phenotypic heterogeneity was present even amongst individuals harboring the same variant. To explore the complex phenotypic variation in this expanded cohort, the relationships between syndromic phenotypes with three variables of interest were interrogated: sex, gene containing the causative variant, and variant location in the H3.3 protein. While specific genotype-phenotype correlations have not been conclusively delineated, the results presented here suggest that the location of the variants within the H3.3 protein and the affected gene (H3-3A or H3-3B) contribute more to the severity of distinct phenotypes than sex. Since these variables do not account for all BLBS phenotypic variability, these findings suggest that additional factors may play a role in modifying the phenotypes of affected individuals. Histones are poised at the interface of genetics and epigenetics, highlighting the potential role for gene-environment interactions and the importance of future research., (© 2024. The Author(s).)

Published
2024
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12. Correction: Expanded phenotypic spectrum of neurodevelopmental and neurodegenerative disorder Bryant-Li-Bhoj syndrome with 38 additional individuals.

Author

Layo-Carris DE, Lubin EE, Sangree AK, Clark KJ, Durham EL, Gonzalez EM, Smith S, Angireddy R, Wang XM, Weiss E, Toutain A, Mendoza-Londono R, Dupuis L, Damseh N, Velasco D, Valenzuela I, Codina-Solà M, Ziats C, Have J, Clarkson K, Steel D, Kurian M, Barwick K, Carrasco D, Dagli AI, Nowaczyk MJM, Hančárová M, Bendová Š, Prchalova D, Sedláček Z, Baxová A, Nowak CB, Douglas J, Chung WK, Longo N, Platzer K, Klöckner C, Averdunk L, Wieczorek D, Krey I, Zweier C, Reis A, Balci T, Simon M, Kroes HY, Wiesener A, Vasileiou G, Marinakis NM, Veltra D, Sofocleous C, Kosma K, Synodinos JT, Voudris KA, Vuillaume ML, Gueguen P, Derive N, Colin E, Battault C, Au B, Delatycki M, Wallis M, Gallacher L, Majdoub F, Smal N, Weckhuysen S, Schoonjans AS, Kooy RF, Meuwissen M, Cocanougher BT, Taylor K, Pizoli CE, McDonald MT, James P, Roeder ER, Littlejohn R, Borja NA, Thorson W, King K, Stoeva R, Suerink M, Nibbeling E, Baskin S, Guyader GLE, Kaplan J, Muss C, Carere DA, Bhoj EJK, and Bryant LM

Published
2024
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13. Genome-wide analysis identifies MYH11 compound heterozygous variants leading to visceral myopathy corresponding to late-onset form of megacystis-microcolon-intestinal hypoperistalsis syndrome.

Author

Billon C, Piccoli GB, de Sainte Agathe JM, Stoeva R, Derive N, Heidet L, Berrebi D, Bruneval P, Jeunemaitre X, and Hureaux M

Subjects
Adult, Humans, Male, Myosin Heavy Chains genetics, Retrospective Studies, Female, Abnormalities, Multiple, Colon abnormalities, Duodenum abnormalities, Fetal Diseases, Intestinal Obstruction, Intestinal Pseudo-Obstruction genetics, Urinary Bladder abnormalities
Abstract

Megacystis-microcolon-hypoperistalsis-syndrome (MMIHS) is a rare and early-onset congenital disease characterized by massive abdominal distension due to a large non-obstructive bladder, a microcolon and decreased or absent intestinal peristalsis. While in most cases inheritance is autosomal dominant and associated with heterozygous variant in ACTG2 gene, an autosomal recessive transmission has also been described including pathogenic bialellic loss-of-function variants in MYH11. We report here a novel family with visceral myopathy related to MYH11 gene, confirmed by whole genome sequencing (WGS). WGS was performed in two siblings with unusual presentation of MMIHS and their two healthy parents. The 38 years-old brother had severe bladder dysfunction and intestinal obstruction, whereas the 30 years-old sister suffered from end-stage kidney disease with neurogenic bladder and recurrent sigmoid volvulus. WGS was completed by retrospective digestive pathological analyses. Compound heterozygous variants of MYH11 gene were identified, associating a deletion of 1.2 Mb encompassing MYH11 inherited from the father and an in-frame variant c.2578_2580del, p.Glu860del inherited from the mother. Pathology analyses of the colon and the rectum revealed structural changes which significance of which is discussed. Cardiac and vascular assessment of the mother was normal. This is the second report of a visceral myopathy corresponding to late-onset form of MMIHS related to compound heterozygosity in MYH11; with complete gene deletion and a hypomorphic allele in trans. The hypomorphic allele harbored by the mother raised the question of the risk of aortic disease in adults. This case shows the interest of WGS in deciphering complex phenotypes, allowing adapted diagnosis and genetic counselling., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Published
2024
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14. First reports of fetal SMARCC1 related hydrocephalus.

Author

Rive Le Gouard N, Nicolle R, Lefebvre M, Gelot A, Heide S, Gerasimenko A, Grigorescu R, Derive N, Jouannic JM, Garel C, Valence S, Quenum-Miraillet G, Chantot-Bastaraud S, Keren B, Heron D, and Attie-Bitach T

Subjects
Humans, Fetus, Genetic Counseling, Transcription Factors genetics, Hydrocephalus diagnostic imaging, Hydrocephalus genetics
Abstract

The SMARCC1 gene has been involved in congenital ventriculomegaly with aqueduct stenosis but only a few patients have been reported so far, with no antenatal cases, and it is currently not annotated as a morbid gene in OMIM nor in the Human Phenotype Ontology. Most of the reported variants are loss of function (LoF) and are often inherited from unaffected parents. SMARCC1 encodes a subunit of the mSWI/SNF complex and affects the chromatin structure and expression of several genes. Here, we report the two first antenatal cases of SMARCC1 LoF variants detected by Whole Genome Sequencing (WGS). Ventriculomegaly is the common feature in those fetuses. Both identified variants are inherited from a healthy parent, which supports the reported incomplete penetrance of this gene. This makes the identification of this condition in WGS as well as the genetic counseling challenging., Competing Interests: Declaration of competing interest The authors declare no potential conflict of interest., (Copyright © 2023 Elsevier Masson SAS. All rights reserved.)

Published
2023
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16. Heterozygous variants in ZBTB7A cause a neurodevelopmental disorder associated with symptomatic overgrowth of pharyngeal lymphoid tissue, macrocephaly, and elevated fetal hemoglobin.

Author

von der Lippe C, Tveten K, Prescott TE, Holla ØL, Busk ØL, Burke KB, Sansbury FH, Baptista J, Fry AE, Lim D, Jolles S, Evans J, Osio D, Macmillan C, Bruno I, Faletra F, Climent S, Urreitzi R, Hoenicka J, Palau F, Cohen ASA, Engleman K, Zhou D, Amudhavalli SM, Jeanne M, Bonnet-Brilhault F, Lévy J, Drunat S, Derive N, Haug MG, and Thorstensen WM

Subjects
Cell Line, Tumor, DNA-Binding Proteins genetics, Fetal Hemoglobin, Humans, Lymphoid Tissue, Transcription Factors genetics, Intellectual Disability genetics, Megalencephaly genetics, Neurodevelopmental Disorders genetics
Abstract

By clinical whole exome sequencing, we identified 12 individuals with ages 3 to 37 years, including three individuals from the same family, with a consistent phenotype of intellectual disability (ID), macrocephaly, and overgrowth of adenoid tissue. All 12 individuals harbored a rare heterozygous variant in ZBTB7A which encodes the transcription factor Zinc finger and BTB-domain containing protein 7A, known to play a role in lympho- and hematopoiesis. ID was generally mild. Fetal hemoglobin (HbF) fraction was elevated 2.2%-11.2% (reference value <2% in individuals > 6 months) in four of the five individuals for whom results were available. Ten of twelve individuals had undergone surgery at least once for lymphoid hypertrophy limited to the pharynx. In the most severely affected individual (individual 1), airway obstruction resulted in 17 surgical procedures before the age of 13 years. Sleep apnea was present in 8 of 10 individuals. In the nine unrelated individuals, ZBTB7A variants were novel and de novo. The six frameshift/nonsense and four missense variants were spread throughout the gene. This is the first report of a cohort of individuals with this novel syndromic neurodevelopmental disorder., (© 2021 Wiley Periodicals LLC.)

Published
2022
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17. Biallelic AOPEP Loss-of-Function Variants Cause Progressive Dystonia with Prominent Limb Involvement.

Author

Zech M, Kumar KR, Reining S, Reunert J, Tchan M, Riley LG, Drew AP, Adam RJ, Berutti R, Biskup S, Derive N, Bakhtiari S, Jin SC, Kruer MC, Bardakjian T, Gonzalez-Alegre P, Keller Sarmiento IJ, Mencacci NE, Lubbe SJ, Kurian MA, Clot F, Méneret A, de Sainte Agathe JM, Fung VSC, Vidailhet M, Baumann M, Marquardt T, Winkelmann J, and Boesch S

Subjects
Exome, Humans, Mutation, Pedigree, Phenotype, Aminopeptidases genetics, Dystonia genetics, Dystonic Disorders genetics, Loss of Function Mutation
Abstract

Background: Monogenic causes of isolated dystonia are heterogeneous. Assembling cohorts of affected individuals sufficiently large to establish new gene-disease relationships can be challenging., Objective: We sought to expand the catalogue of monogenic etiologies for isolated dystonia., Methods: After the discovery of a candidate variant in a multicenter exome-sequenced cohort of affected individuals with dystonia, we queried online platforms and genomic data repositories worldwide to identify subjects with matching genotypic profiles., Results: Seven different biallelic loss-of-function variants in AOPEP were detected in five probands from four unrelated families with strongly overlapping phenotypes. In one proband, we observed a homozygous nonsense variant (c.1477C>T [p.Arg493*]). A second proband harbored compound heterozygous nonsense variants (c.763C>T [p.Arg255*]; c.777G>A [p.Trp259*]), whereas a third proband possessed a frameshift variant (c.696&#95;697delAG [p.Ala234Serfs*5]) in trans with a splice-disrupting alteration (c.2041-1G>A). Two probands (siblings) from a fourth family shared compound heterozygous frameshift alleles (c.1215delT [p.Val406Cysfs*14]; c.1744delA [p.Met582Cysfs*6]). All variants were rare and expected to result in truncated proteins devoid of functionally important amino acid sequence. AOPEP, widely expressed in developing and adult human brain, encodes a zinc-dependent aminopeptidase, a member of a class of proteolytic enzymes implicated in synaptogenesis and neural maintenance. The probands presented with disabling progressive dystonia predominantly affecting upper and lower extremities, with variable involvement of craniocervical muscles. Dystonia was unaccompanied by any additional symptoms in three families, whereas the fourth family presented co-occurring late-onset parkinsonism., Conclusions: Our findings suggest a likely causative role of predicted inactivating biallelic AOPEP variants in cases of autosomal recessive dystonia. Additional studies are warranted to understand the pathophysiology associated with loss-of-function variation in AOPEP. © 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society., (© 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.)

Published
2022
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18. Classification of 101 BRCA1 and BRCA2 variants of uncertain significance by cosegregation study: A powerful approach.

Author

Caputo SM, Golmard L, Léone M, Damiola F, Guillaud-Bataille M, Revillion F, Rouleau E, Derive N, Buisson A, Basset N, Schwartz M, Vilquin P, Garrec C, Privat M, Gay-Bellile M, Abadie C, Abidallah K, Airaud F, Allary AS, Barouk-Simonet E, Belotti M, Benigni C, Benusiglio PR, Berthemin C, Berthet P, Bertrand O, Bézieau S, Bidart M, Bignon YJ, Birot AM, Blanluet M, Bloucard A, Bombled J, Bonadona V, Bonnet F, Bonnet-Dupeyron MN, Boulaire M, Boulouard F, Bouras A, Bourdon V, Brahimi A, Brayotel F, Bressac de Paillerets B, Bronnec N, Bubien V, Buecher B, Cabaret O, Carriere J, Chiesa J, Chieze-Valéro S, Cohen C, Cohen-Haguenauer O, Colas C, Collonge-Rame MA, Conoy AL, Coulet F, Coupier I, Crivelli L, Cusin V, De Pauw A, Dehainault C, Delhomelle H, Delnatte C, Demontety S, Denizeau P, Devulder P, Dreyfus H, d'Enghein CD, Dupré A, Durlach A, Dussart S, Fajac A, Fekairi S, Fert-Ferrer S, Fiévet A, Fouillet R, Mouret-Fourme E, Gauthier-Villars M, Gesta P, Giraud S, Gladieff L, Goldbarg V, Goussot V, Guibert V, Guillerm E, Guy C, Hardouin A, Heude C, Houdayer C, Ingster O, Jacquot-Sawka C, Jones N, Krieger S, Lacoste S, Lallaoui H, Larbre H, Laugé A, Le Guyadec G, Le Mentec M, Lecerf C, Le Gall J, Legendre B, Legrand C, Legros A, Lejeune S, Lidereau R, Lignon N, Limacher JM, Doriane Livon, Lizard S, Longy M, Lortholary A, Macquere P, Mailliez A, Malsa S, Margot H, Mari V, Maugard C, Meira C, Menjard J, Molière D, Moncoutier V, Moretta-Serra J, Muller E, Nevière Z, Nguyen Minh Tuan TV, Noguchi T, Noguès C, Oca F, Popovici C, Prieur F, Raad S, Rey JM, Ricou A, Salle L, Saule C, Sevenet N, Simaga F, Sobol H, Suybeng V, Tennevet I, Tenreiro H, Tinat J, Toulas C, Turbiez I, Uhrhammer N, Vande Perre P, Vaur D, Venat L, Viellard N, Villy MC, Warcoin M, Yvard A, Zattara H, Caron O, Lasset C, Remenieras A, Boutry-Kryza N, Castéra L, and Stoppa-Lyonnet D

Subjects
Breast Neoplasms classification, Breast Neoplasms genetics, Female, Genetic Testing, Genotype, Humans, Ovarian Neoplasms classification, Ovarian Neoplasms genetics, BRCA1 Protein genetics, BRCA2 Protein genetics, Breast Neoplasms pathology, Genetic Predisposition to Disease, Genetic Variation, Ovarian Neoplasms pathology
Abstract

Up to 80% of BRCA1 and BRCA2 genetic variants remain of uncertain clinical significance (VUSs). Only variants classified as pathogenic or likely pathogenic can guide breast and ovarian cancer prevention measures and treatment by PARP inhibitors. We report the first results of the ongoing French national COVAR (cosegregation variant) study, the aim of which is to classify BRCA1/2 VUSs. The classification method was a multifactorial model combining different associations between VUSs and cancer, including cosegregation data. At this time, among the 653 variants selected, 101 (15%) distinct variants shared by 1,624 families were classified as pathogenic/likely pathogenic or benign/likely benign by the COVAR study. Sixty-six of the 101 (65%) variants classified by COVAR would have remained VUSs without cosegregation data. Of note, among the 34 variants classified as pathogenic by COVAR, 16 remained VUSs or likely pathogenic when following the ACMG/AMP variant classification guidelines. Although the initiation and organization of cosegregation analyses require a considerable effort, the growing number of available genetic tests results in an increasing number of families sharing a particular variant, and thereby increases the power of such analyses. Here we demonstrate that variant cosegregation analyses are a powerful tool for the classification of variants in the BRCA1/2 breast-ovarian cancer predisposition genes., Competing Interests: Declaration of interests D.S.-L. and the Institut Curie have received honoraria for her participation in education meetings organized by AstraZeneca or Tesaro. The remaining authors declare no conflict of interest., (Copyright © 2021 American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.)

Published
2021
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19. Large scale multifactorial likelihood quantitative analysis of BRCA1 and BRCA2 variants: An ENIGMA resource to support clinical variant classification.

Author

Parsons MT, Tudini E, Li H, Hahnen E, Wappenschmidt B, Feliubadaló L, Aalfs CM, Agata S, Aittomäki K, Alducci E, Alonso-Cerezo MC, Arnold N, Auber B, Austin R, Azzollini J, Balmaña J, Barbieri E, Bartram CR, Blanco A, Blümcke B, Bonache S, Bonanni B, Borg Å, Bortesi B, Brunet J, Bruzzone C, Bucksch K, Cagnoli G, Caldés T, Caliebe A, Caligo MA, Calvello M, Capone GL, Caputo SM, Carnevali I, Carrasco E, Caux-Moncoutier V, Cavalli P, Cini G, Clarke EM, Concolino P, Cops EJ, Cortesi L, Couch FJ, Darder E, de la Hoya M, Dean M, Debatin I, Del Valle J, Delnatte C, Derive N, Diez O, Ditsch N, Domchek SM, Dutrannoy V, Eccles DM, Ehrencrona H, Enders U, Evans DG, Farra C, Faust U, Felbor U, Feroce I, Fine M, Foulkes WD, Galvao HCR, Gambino G, Gehrig A, Gensini F, Gerdes AM, Germani A, Giesecke J, Gismondi V, Gómez C, Gómez Garcia EB, González S, Grau E, Grill S, Gross E, Guerrieri-Gonzaga A, Guillaud-Bataille M, Gutiérrez-Enríquez S, Haaf T, Hackmann K, Hansen TVO, Harris M, Hauke J, Heinrich T, Hellebrand H, Herold KN, Honisch E, Horvath J, Houdayer C, Hübbel V, Iglesias S, Izquierdo A, James PA, Janssen LAM, Jeschke U, Kaulfuß S, Keupp K, Kiechle M, Kölbl A, Krieger S, Kruse TA, Kvist A, Lalloo F, Larsen M, Lattimore VL, Lautrup C, Ledig S, Leinert E, Lewis AL, Lim J, Loeffler M, López-Fernández A, Lucci-Cordisco E, Maass N, Manoukian S, Marabelli M, Matricardi L, Meindl A, Michelli RD, Moghadasi S, Moles-Fernández A, Montagna M, Montalban G, Monteiro AN, Montes E, Mori L, Moserle L, Müller CR, Mundhenke C, Naldi N, Nathanson KL, Navarro M, Nevanlinna H, Nichols CB, Niederacher D, Nielsen HR, Ong KR, Pachter N, Palmero EI, Papi L, Pedersen IS, Peissel B, Perez-Segura P, Pfeifer K, Pineda M, Pohl-Rescigno E, Poplawski NK, Porfirio B, Quante AS, Ramser J, Reis RM, Revillion F, Rhiem K, Riboli B, Ritter J, Rivera D, Rofes P, Rump A, Salinas M, Sánchez de Abajo AM, Schmidt G, Schoenwiese U, Seggewiß J, Solanes A, Steinemann D, Stiller M, Stoppa-Lyonnet D, Sullivan KJ, Susman R, Sutter C, Tavtigian SV, Teo SH, Teulé A, Thomassen M, Tibiletti MG, Tischkowitz M, Tognazzo S, Toland AE, Tornero E, Törngren T, Torres-Esquius S, Toss A, Trainer AH, Tucker KM, van Asperen CJ, van Mackelenbergh MT, Varesco L, Vargas-Parra G, Varon R, Vega A, Velasco Á, Vesper AS, Viel A, Vreeswijk MPG, Wagner SA, Waha A, Walker LC, Walters RJ, Wang-Gohrke S, Weber BHF, Weichert W, Wieland K, Wiesmüller L, Witzel I, Wöckel A, Woodward ER, Zachariae S, Zampiga V, Zeder-Göß C, Lázaro C, De Nicolo A, Radice P, Engel C, Schmutzler RK, Goldgar DE, and Spurdle AB

Subjects
Alternative Splicing, Early Detection of Cancer, Female, Genetic Predisposition to Disease, Humans, Likelihood Functions, Male, Multifactorial Inheritance, Neoplasms genetics, BRCA1 Protein genetics, BRCA2 Protein genetics, Computational Biology methods, Mutation, Missense, Neoplasms diagnosis
Abstract

The multifactorial likelihood analysis method has demonstrated utility for quantitative assessment of variant pathogenicity for multiple cancer syndrome genes. Independent data types currently incorporated in the model for assessing BRCA1 and BRCA2 variants include clinically calibrated prior probability of pathogenicity based on variant location and bioinformatic prediction of variant effect, co-segregation, family cancer history profile, co-occurrence with a pathogenic variant in the same gene, breast tumor pathology, and case-control information. Research and clinical data for multifactorial likelihood analysis were collated for 1,395 BRCA1/2 predominantly intronic and missense variants, enabling classification based on posterior probability of pathogenicity for 734 variants: 447 variants were classified as (likely) benign, and 94 as (likely) pathogenic; and 248 classifications were new or considerably altered relative to ClinVar submissions. Classifications were compared with information not yet included in the likelihood model, and evidence strengths aligned to those recommended for ACMG/AMP classification codes. Altered mRNA splicing or function relative to known nonpathogenic variant controls were moderately to strongly predictive of variant pathogenicity. Variant absence in population datasets provided supporting evidence for variant pathogenicity. These findings have direct relevance for BRCA1 and BRCA2 variant evaluation, and justify the need for gene-specific calibration of evidence types used for variant classification., (© 2019 Wiley Periodicals, Inc.)

Published
2019
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20. BRCA Share: A Collection of Clinical BRCA Gene Variants.

Author

Béroud C, Letovsky SI, Braastad CD, Caputo SM, Beaudoux O, Bignon YJ, Bressac-De Paillerets B, Bronner M, Buell CM, Collod-Béroud G, Coulet F, Derive N, Divincenzo C, Elzinga CD, Garrec C, Houdayer C, Karbassi I, Lizard S, Love A, Muller D, Nagan N, Nery CR, Rai G, Revillion F, Salgado D, Sévenet N, Sinilnikova O, Sobol H, Stoppa-Lyonnet D, Toulas C, Trautman E, Vaur D, Vilquin P, Weymouth KS, Willis A, Eisenberg M, and Strom CM

Subjects
Data Curation, Female, Genetic Predisposition to Disease, Humans, Mutation, BRCA1 Protein genetics, BRCA2 Protein genetics, Breast Neoplasms genetics, Databases, Factual economics, Ovarian Neoplasms genetics
Abstract

As next-generation sequencing increases access to human genetic variation, the challenge of determining clinical significance of variants becomes ever more acute. Germline variants in the BRCA1 and BRCA2 genes can confer substantial lifetime risk of breast and ovarian cancer. Assessment of variant pathogenicity is a vital part of clinical genetic testing for these genes. A database of clinical observations of BRCA variants is a critical resource in that process. This article describes BRCA Share™, a database created by a unique international alliance of academic centers and commercial testing laboratories. By integrating the content of the Universal Mutation Database generated by the French Unicancer Genetic Group with the testing results of two large commercial laboratories, Quest Diagnostics and Laboratory Corporation of America (LabCorp), BRCA Share™ has assembled one of the largest publicly accessible collections of BRCA variants currently available. Although access is available to academic researchers without charge, commercial participants in the project are required to pay a support fee and contribute their data. The fees fund the ongoing curation effort, as well as planned experiments to functionally characterize variants of uncertain significance. BRCA Share™ databases can therefore be considered as models of successful data sharing between private companies and the academic world., (© 2016 WILEY PERIODICALS, INC.)

Published
2016
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21. Bub3-BubR1-dependent sequestration of Cdc20Fizzy at DNA breaks facilitates the correct segregation of broken chromosomes.

Author

Derive N, Landmann C, Montembault E, Claverie MC, Pierre-Elies P, Goutte-Gattat D, Founounou N, McCusker D, and Royou A

Subjects
Anaphase genetics, Anaphase-Promoting Complex-Cyclosome genetics, Anaphase-Promoting Complex-Cyclosome metabolism, Animals, Cell Cycle Proteins genetics, Chromosomes metabolism, DNA Breaks, Double-Stranded, Diptera genetics, Drosophila genetics, Drosophila metabolism, Drosophila Proteins genetics, Protein Serine-Threonine Kinases genetics, Protein Serine-Threonine Kinases metabolism, Spindle Apparatus genetics, Spindle Apparatus metabolism, Ubiquitin-Protein Ligases genetics, Ubiquitin-Protein Ligases metabolism, Cdc20 Proteins metabolism, Cell Cycle Proteins metabolism, Chromosomes genetics, Diptera metabolism, Drosophila Proteins metabolism
Abstract

The presence of DNA double-strand breaks during mitosis is particularly challenging for the cell, as it produces broken chromosomes lacking a centromere. This situation can cause genomic instability resulting from improper segregation of the broken fragments into daughter cells. We recently uncovered a process by which broken chromosomes are faithfully transmitted via the BubR1-dependent tethering of the two broken chromosome ends. However, the mechanisms underlying BubR1 recruitment and function on broken chromosomes were largely unknown. We show that BubR1 requires interaction with Bub3 to localize on the broken chromosome fragments and to mediate their proper segregation. We also find that Cdc20, a cofactor of the E3 ubiquitin ligase anaphase-promoting complex/cyclosome (APC/C), accumulates on DNA breaks in a BubR1 KEN box-dependent manner. A biosensor for APC/C activity demonstrates a BubR1-dependent local inhibition of APC/C around the segregating broken chromosome. We therefore propose that the Bub3-BubR1 complex on broken DNA inhibits the APC/C locally via the sequestration of Cdc20, thus promoting proper transmission of broken chromosomes., (© 2015 Derive et al.)

Published
2015
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