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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Hum+Genet
2017 ; 100
(5
): 773-788
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gab.com Text
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CHARGE and Kabuki Syndromes: Gene-Specific DNA Methylation Signatures Identify
Epigenetic Mechanisms Linking These Clinically Overlapping Conditions
#MMPMID28475860
Butcher DT
; Cytrynbaum C
; Turinsky AL
; Siu MT
; Inbar-Feigenberg M
; Mendoza-Londono R
; Chitayat D
; Walker S
; Machado J
; Caluseriu O
; Dupuis L
; Grafodatskaya D
; Reardon W
; Gilbert-Dussardier B
; Verloes A
; Bilan F
; Milunsky JM
; Basran R
; Papsin B
; Stockley TL
; Scherer SW
; Choufani S
; Brudno M
; Weksberg R
Am J Hum Genet
2017[May]; 100
(5
): 773-788
PMID28475860
show ga
Epigenetic dysregulation has emerged as a recurring mechanism in the etiology of
neurodevelopmental disorders. Two such disorders, CHARGE and Kabuki syndromes,
result from loss of function mutations in chromodomain helicase DNA-binding
protein 7 (CHD7(LOF)) and lysine (K) methyltransferase 2D (KMT2D(LOF)),
respectively. Although these two syndromes are clinically distinct, there is
significant phenotypic overlap. We therefore expected that epigenetically driven
developmental pathways regulated by CHD7 and KMT2D would overlap and that DNA
methylation (DNAm) alterations downstream of the mutations in these genes would
identify common target genes, elucidating a mechanistic link between these two
conditions, as well as specific target genes for each disorder. Genome-wide DNAm
profiles in individuals with CHARGE and Kabuki syndromes with CHD7(LOF) or
KMT2D(LOF) identified distinct sets of DNAm differences in each of the disorders,
which were used to generate two unique, highly specific and sensitive DNAm
signatures. These DNAm signatures were able to differentiate pathogenic mutations
in these two genes from controls and from each other. Analysis of the DNAm
targets in each gene-specific signature identified both common gene targets,
including homeobox A5 (HOXA5), which could account for some of the clinical
overlap in CHARGE and Kabuki syndromes, as well as distinct gene targets. Our
findings demonstrate how characterization of the epigenome can contribute to our
understanding of disease pathophysiology for epigenetic disorders, paving the way
for explorations of novel therapeutics.