A de novo Mutation in KMT2A (MLL) in monozygotic twins with Wiedemann–Steiner Syndrome

Dunkerton, Sophie, Field, Matthew, Cho, Vicki, Bertram, Edward, Whittle, Belinda, Groves, Alexandra, and Goel, Himanshu (2015) A de novo Mutation in KMT2A (MLL) in monozygotic twins with Wiedemann–Steiner Syndrome. American Journal of Medical Genetics: Part A, 167 (9). pp. 2182-2187.

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Abstract

Growth deficiency, psychomotor delay, and facial dysmorphism was originally described in a male patient in 1989 by Wiedemann et al. and later in 2000 by Steiner et al. Wiedemann–Steiner syndrome (WSS) has since been described only a few times in the literature, with the phenotypic spectrum both expanding and becoming more delineated with each patient reported. We report on the clinical and molecular features of monozygotic twins with a de novo mutation in KMT2A. Single nucleotide polymorphism (SNP) microarray was done on both twins and whole-exome sequencing was done using both parents and one of the affected twins. SNP microarray confirmed that they were monozygotic twins. A de novo heterozygous variant (p. Arg1083*) in the KMT2A gene was identified through whole-exome sequencing, confirming the diagnosis of WSS. In this study, we have identified a de novo mutation in KMT2A associated with psychomotor developmental delay, facial dysmorphism, short stature, hypertrichosis cubiti, and small kidneys. This finding in monozygotic twins gives specificity to the WSS. The description of more cases of WSS is needed for further delineation of this condition. Small kidneys with normal function have not been described in this condition in the medical literature before.

Item ID: 43590
Item Type: Article (Refereed Research - C1)
Keywords: Wiedemann–Steiner syndrome; KMT2A; MLL; de novo; SNP; monozygotic twins; hypertrichosis cubiti
ISSN: 1552-4833
Date Deposited: 29 Apr 2016 05:42
FoR Codes: 06 BIOLOGICAL SCIENCES > 0601 Biochemistry and Cell Biology > 060102 Bioinformatics @ 25%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060408 Genomics @ 25%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110311 Medical Genetics (excl Cancer Genetics) @ 50%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920110 Inherited Diseases (incl. Gene Therapy) @ 100%
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