Whole-exome-sequencing identifies mutations in histone acetyltransferase gene KAT6B in individuals with the Say-Barber-Biesecker variant of Ohdo syndrome.

Abstract

Say-Barber-Biesecker-Young-Simpson syndrome (SBBYSS or Ohdo syndrome) is a multiple anomaly syndrome characterized by severe intellectual disability, blepharophimosis, and a mask-like facial appearance. A number of individuals with SBBYSS also have thyroid abnormalities and cleft palate. The condition usually occurs sporadically and is therefore presumed to be due in most cases to new dominant mutations. In individuals with SBBYSS, a whole-exome sequencing approach was used to demonstrate de novo protein-truncating mutations in the highly conserved histone acetyltransferase gene KAT6B (MYST4/MORF)) in three out of four individuals sequenced. Sanger sequencing was used to confirm truncating mutations of KAT6B, clustering in the final exon of the gene in all four individuals and in a further nine persons with typical SBBYSS. Where parental samples were available, the mutations were shown to have occurred de novo. During mammalian development KAT6B is upregulated specifically in the developing central nervous system, facial structures, and limb buds. The phenotypic features seen in the Qkf mouse, a hypomorphic Kat6b mutant, include small eyes, ventrally placed ears and long first digits that mirror the human phenotype. This is a further example of how perturbation of a protein involved in chromatin modification might give rise to a multisystem developmental disorder.

• Authors: Jill Clayton-Smith, James O'Sullivan, Sarah Daly, Sanjeev Bhaskar, Ruth Day, Beverley Anderson, Anne K Voss, Tim Thomas, Leslie G Biesecker, Philip Smith, Alan Fryer, Kate E Chandler, Bronwyn Kerr, May Tassabehji, Sally-Ann Lynch, Malgorzata Krajewska-Walasek, Shane McKee, Janine Smith, Elizabeth Sweeney, Sahar Mansour, Shehla Mohammed, Dian Donnai, Graeme Black
• Journal: American journal of human genetics (Am J Hum Genet) Vol. 89 Issue 5 Pg. 675-81 (Nov 11 2011) ISSN: 1537-6605 [Electronic] United States
• PMID: 22077973 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

Chemical References

• Chromatin
• Codon, Nonsense
• Histone Acetyltransferases
• KAT6B protein, human

Topics

• Abnormalities, Multiple (genetics)
• Adult
• Animals
• Blepharophimosis (genetics)
• Child
• Chromatin (metabolism)
• Chromosomes, Human, Pair 10 (genetics)
• Codon, Nonsense (genetics)
• Congenital Hypothyroidism (genetics)
• Exome (genetics)
• Facies
• Female
• Gene Expression Regulation, Developmental
• Heart Defects, Congenital
• Histone Acetyltransferases (deficiency, genetics)
• Humans
• INDEL Mutation (genetics)
• Intellectual Disability (genetics)
• Joint Instability
• Male
• Metabolism, Inborn Errors (genetics)
• Mice
• Mice, Transgenic
• Microarray Analysis
• Polymorphism, Single Nucleotide (genetics)