A novel de novo frameshift deletion in EHMT1 in a patient with Kleefstra Syndrome results in decreased H3K9 dimethylation.

Abstract:

BACKGROUND:Kleefstra Syndrome (KS) (MIM# 610253) is an autosomal dominant disorder caused by haploinsufficiency of euchromatic histone methyltransferase-1 (EHMT1, GLP). EHMT1 (MIM# 607001) encodes a histone methyltransferase that heterodimerizes with EHMT2 (also known as G9a, MIM# 604599), which together are responsible for mono- and dimethylation of H3 lysine 9 (H3K9me1 and -me2), resulting in transcriptional repression of target genes. METHODS:This report describes an 18-year-old woman with intellectual disability, severely limited speech, hypotonia, microcephaly, and facial dysmorphisms, who was found to have a novel de novo single-base frameshift deletion in EHMT1. RESULTS:Functional studies using patient fibroblasts showed decreased H3K9me2 compared to wild-type control cells, thus providing a rapid confirmatory test that complements molecular studies. CONCLUSION:Whole exome sequencing revealed a novel frameshift deletion in EHMT1 after a lengthy diagnostic odyssey in this patient. Functional testing using this patient's fibroblasts provides proof-of-concept for the analysis of variants of uncertain significance that are predicted to impact EHMT1 enzymatic activity.

journal_name

Mol Genet Genomic Med

authors

Blackburn PR,Williams M,Cousin MA,Boczek NJ,Beek GJ,Lomberk GA,Urrutia RA,Babovic-Vuksanovic D,Klee EW

doi

10.1002/mgg3.268

subject

Has Abstract

pub_date

2017-01-26 00:00:00

pages

141-146

issue

2

issn

2324-9269

pii

MGG3268

journal_volume

5

pub_type

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