1. BCL11A intellectual developmental disorder: defining the clinical spectrum and genotype-phenotype correlations
- Author
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Øyvind L. Busk, Kimberley Bradbury, Arjan Bouman, Philippe M. Campeau, Lynne M. Bird, Cornelia Kraus, Colleen Carlston, Rong Mao, Juliette Piard, Laurence Faivre, Amanda Openshaw, Catherine Ward Melver, Mohnish Suri, Christiane Zweier, François Guillemot, Rolph Pfundt, Janice C. Palumbos, Parthiv Haldipur, Jane A. Hurst, Kimberly McDonald, Margaux Serey-Gaut, Luitgard Graul-Neumann, Karen J. Low, Jenny Carmichael, Patrick Ferrerira, Birgit Elisabeth Kristiansen, Ange-Line Bruel, Constance Motter, Andrea Accogli, Darrah N. Haffner, Suhair Hanna, Ruta Marcinkute, Angela Peron, Marcella Zollino, Sofia Maia, James Lespinasse, Claire E. Turner, Sally Ann Lynch, Richard E. Person, Valeria Capra, Kimberly A. Aldinger, Constance Smith-Hicks, Gyri Aasland Gradek, Ingrid M. Wentzensen, Megha Desai, Manuela Morleo, Aditi Shah Parikh, Marcello Scala, Cristina Dias, Gunnar Houge, Telethon Undiagnosed Disease Program, Anne Slavotinek, Roberta Battini, Mary J. Green, Anna Chassevent, Tara Montgomery, David Viskochil, Tatiana Tvrdik, Dawn L. Earl, Karin Weiss, Felice D'Arco, William B. Dobyns, Ping Yee Billie Au, Daniah Beleford, Erica F. Andersen, Bert B.A. de Vries, Jill Clayton-Smith, Christophe Philippe, and Michael J. Bamshad
- Subjects
business.industry ,Postnatal microcephaly ,Microdeletion syndrome ,medicine.disease ,Bioinformatics ,Hypotonia ,Developmental disorder ,Autism spectrum disorder ,Intellectual disability ,Fetal hemoglobin ,medicine ,Missense mutation ,medicine.symptom ,business - Abstract
PurposeHeterozygous variants in BCL11A underlie an intellectual developmental disorder with persistence of fetal hemoglobin (BCL11A-IDD, a.k.a. Dias-Logan syndrome). We sought to delineate the genotypic and phenotypic spectrum of BCL11A-IDD.MethodsWe performed an in-depth analysis of 42 patients with BCL11A-IDD ascertained through a collaborative network of clinical and research colleagues. We also reviewed 33 additional affected individuals previously reported in the literature or available through public repositories with clinical information.ResultsMolecular and clinical data analysis of 75 patients with BCL11A-IDD identified 60 unique variants (30 frameshift, 7 missense, 6 splice-site, 17 stop-gain) and 8 unique CNVs (microdeletions involving BCL11A only). We redefined the most frequent manifestations of the condition: intellectual disability, hypotonia, behavioral abnormalities, postnatal microcephaly and autism spectrum disorder. Two thirds of patients have brain MRI abnormalities, and we identified a recurrent posterior fossa phenotype of vermian hypoplasia and/or small brainstem. Truncating BCL11A variants, particularly those affecting the long (BCL11A-L) and extra-long (-XL) isoforms, sparing the short (-S) isoform, were associated with increased severity.ConclusionsWe expand the clinical delineation of BCL11A-IDD and identify a potential isoform-specific genotype-phenotype correlation. We show that BCL11A-IDD is associated with posterior fossa anomalies and highlight the differences between BCL11A-IDD and 2p16.1p15 microdeletion syndrome.
- Published
- 2021
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