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Bi-allelic TARS Mutations Are Associated with Brittle Hair Phenotype
- Source :
- American journal of human genetics, 105(2), 434-440. Cell Press, The American Journal of Human Genetics, American Journal of Human Genetics, 105(2), 434-440. Cell Press, Theil, A F, Botta, E, Raams, A, Smith, D E C, Mendes, M I, Caligiuri, G, Giachetti, S, Bione, S, Carriero, R, Liberi, G, Zardoni, L, Swagemakers, S M A, Salomons, G S, Sarasin, A, Lehmann, A, van der Spek, P J, Ogi, T, Hoeijmakers, J H J, Vermeulen, W & Orioli, D 2019, ' Bi-allelic TARS Mutations Are Associated with Brittle Hair Phenotype ', American journal of human genetics, vol. 105, no. 2, pp. 434-440 . https://doi.org/10.1016/j.ajhg.2019.06.017
- Publication Year :
- 2019
-
Abstract
- Brittle and “tiger-tail” hair is the diagnostic hallmark of trichothiodystrophy (TTD), a rare recessive disease associated with a wide spectrum of clinical features including ichthyosis, intellectual disability, decreased fertility, and short stature. As a result of premature abrogation of terminal differentiation, the hair is brittle and fragile and contains reduced cysteine content. Hypersensitivity to UV light is found in about half of individuals with TTD; all of these individuals harbor bi-allelic mutations in components of the basal transcription factor TFIIH, and these mutations lead to impaired nucleotide excision repair and basal transcription. Different genes have been found to be associated with non-photosensitive TTD (NPS-TTD); these include MPLKIP (also called TTDN1), GTF2E2 (also called TFIIEβ), and RNF113A. However, a relatively large group of these individuals with NPS-TTD have remained genetically uncharacterized. Here we present the identification of an NPS-TTD-associated gene, threonyl-tRNA synthetase (TARS), found by next-generation sequencing of a group of uncharacterized individuals with NPS-TTD. One individual has compound heterozygous TARS variants, c.826A>G (p.Lys276Glu) and c.1912C>T (p.Arg638∗), whereas a second individual is homozygous for the TARS variant: c.680T>C (p.Leu227Pro). We showed that these variants have a profound effect on TARS protein stability and enzymatic function. Our results expand the spectrum of genes involved in TTD to include genes implicated in amino acid charging of tRNA, which is required for the last step in gene expression, namely protein translation. We previously proposed that some of the TTD-specific features derive from subtle transcription defects as a consequence of unstable transcription factors. We now extend the definition of TTD from a transcription syndrome to a “gene-expression” syndrome.
- Subjects :
- Trichothiodystrophy
Sequence Homology
Biology
Compound heterozygosity
03 medical and health sciences
Transcription (biology)
Report
Genetics
medicine
Threonine-tRNA Ligase
Humans
Trichothiodystrophy Syndromes
Amino Acid Sequence
Allele
Transcription factor
Gene
Genetics (clinical)
Alleles
030304 developmental biology
0303 health sciences
General transcription factor
030305 genetics & heredity
medicine.disease
Phenotype
Case-Control Studies
Mutation
Transcription factor II H
Hair Diseases
Transcription Factor TFIIH
Subjects
Details
- Language :
- English
- ISSN :
- 00029297
- Database :
- OpenAIRE
- Journal :
- American journal of human genetics, 105(2), 434-440. Cell Press, The American Journal of Human Genetics, American Journal of Human Genetics, 105(2), 434-440. Cell Press, Theil, A F, Botta, E, Raams, A, Smith, D E C, Mendes, M I, Caligiuri, G, Giachetti, S, Bione, S, Carriero, R, Liberi, G, Zardoni, L, Swagemakers, S M A, Salomons, G S, Sarasin, A, Lehmann, A, van der Spek, P J, Ogi, T, Hoeijmakers, J H J, Vermeulen, W & Orioli, D 2019, ' Bi-allelic TARS Mutations Are Associated with Brittle Hair Phenotype ', American journal of human genetics, vol. 105, no. 2, pp. 434-440 . https://doi.org/10.1016/j.ajhg.2019.06.017
- Accession number :
- edsair.doi.dedup.....abe0636d65852d8e8df136ce912eec33