Truncating SRCAP variants outside the Floating-Harbor syndrome locus cause a distinct neurodevelopmental disorder with a specific DNA methylation signature.
Abnormalities, Multiple
/ genetics
Adenosine Triphosphatases
/ genetics
Case-Control Studies
Cohort Studies
Craniofacial Abnormalities
/ genetics
DNA Methylation
Epigenesis, Genetic
Female
Genetic Predisposition to Disease
Growth Disorders
/ genetics
Heart Septal Defects, Ventricular
/ genetics
Humans
Infant, Newborn
Male
Mutation
Neurodevelopmental Disorders
/ genetics
Phenotype
DNA methylation signature
Floating-Harbor syndrome
SRCAP
epigenomics
genotype-phenotype correlation
intellectual disability
neurodevelopmental disorders
non-FLHS SRCAP-related NDD
nonsense-mediated decay
speech delay
Journal
American journal of human genetics
ISSN: 1537-6605
Titre abrégé: Am J Hum Genet
Pays: United States
ID NLM: 0370475
Informations de publication
Date de publication:
03 06 2021
03 06 2021
Historique:
received:
20
01
2021
accepted:
31
03
2021
pubmed:
29
4
2021
medline:
29
6
2021
entrez:
28
4
2021
Statut:
ppublish
Résumé
Truncating variants in exons 33 and 34 of the SNF2-related CREBBP activator protein (SRCAP) gene cause the neurodevelopmental disorder (NDD) Floating-Harbor syndrome (FLHS), characterized by short stature, speech delay, and facial dysmorphism. Here, we present a cohort of 33 individuals with clinical features distinct from FLHS and truncating (mostly de novo) SRCAP variants either proximal (n = 28) or distal (n = 5) to the FLHS locus. Detailed clinical characterization of the proximal SRCAP individuals identified shared characteristics: developmental delay with or without intellectual disability, behavioral and psychiatric problems, non-specific facial features, musculoskeletal issues, and hypotonia. Because FLHS is known to be associated with a unique set of DNA methylation (DNAm) changes in blood, a DNAm signature, we investigated whether there was a distinct signature associated with our affected individuals. A machine-learning model, based on the FLHS DNAm signature, negatively classified all our tested subjects. Comparing proximal variants with typically developing controls, we identified a DNAm signature distinct from the FLHS signature. Based on the DNAm and clinical data, we refer to the condition as "non-FLHS SRCAP-related NDD." All five distal variants classified negatively using the FLHS DNAm model while two classified positively using the proximal model. This suggests divergent pathogenicity of these variants, though clinically the distal group presented with NDD, similar to the proximal SRCAP group. In summary, for SRCAP, there is a clear relationship between variant location, DNAm profile, and clinical phenotype. These results highlight the power of combined epigenetic, molecular, and clinical studies to identify and characterize genotype-epigenotype-phenotype correlations.
Identifiants
pubmed: 33909990
pii: S0002-9297(21)00139-7
doi: 10.1016/j.ajhg.2021.04.008
pmc: PMC8206150
pii:
doi:
Substances chimiques
Adenosine Triphosphatases
EC 3.6.1.-
SRCAP protein, human
EC 3.6.4.-
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1053-1068Subventions
Organisme : CIHR
ID : IGH-155182
Pays : Canada
Organisme : CIHR
ID : MOP-126054
Pays : Canada
Informations de copyright
Copyright © 2021 The Author(s). Published by Elsevier Inc. All rights reserved.
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