Phenotype associated with TAF2 biallelic mutations: A clinical description of four individuals and review of the literature

• Published in: European journal of medical genetics Vol. 64; no. 11; p. 104323
• Main Authors: Lesieur-Sebellin, Marion, Capri, Yline, Grisval, Margot, Courtin, Thomas, Burtz, Augustine, Thevenon, Julien, Buratti, Julien, Lejeune, Elodie, Faivre, Laurence, Keren, Boris
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Masson SAS 01.11.2021; Elsevier
• Subjects: Adolescent; Adult; Alleles; Autosomal recessive; Child; Child, Preschool; Corpus Callosum - pathology; Developmental Disabilities - genetics; Developmental Disabilities - pathology; Female; Foot Deformities, Congenital - genetics; Foot Deformities, Congenital - pathology; Genetics; Humans; Intellectual disability; Life Sciences; Male; Microcephaly - genetics; Microcephaly - pathology; Neurodevelopmental disorder; Phenotype; TAF2; TATA-Binding Protein Associated Factors - genetics; Transcription Factor TFIID - genetics; Autosomal recessive; Intellectual disability; Neurodevelopmental disorder; TAF2
• ISSN: 1769-7212; 1878-0849; 1878-0849
• DOI: 10.1016/j.ejmg.2021.104323

Transcription factor IID is a multimeric protein complex that is essential for the initiation of transcription by RNA polymerase II. One of its critical components, the TATA-binding protein-associated factor 2, is encoded by the gene TAF2. Pathogenic variants of this gene have been shown to be responsible for the Mental retardation, autosomal recessive 40 syndrome. This syndrome is characterized by severe intellectual disability, postnatal microcephaly, pyramidal signs and thin corpus callosum. Until now, only three families have been reported separately. Here we report four individuals, from two unrelated families, who present with severe intellectual disability and global developmental delay, postnatal microcephaly, feet deformities and thin corpus callosum and who carry homozygous TAF2 missense variants detected by Exome Sequencing. Taken together, our findings and those of previously reported subjects allow us to further delineate the clinical phenotype associated with TAF2 biallelic mutations.