Journal
JOURNAL OF MEDICAL GENETICS
Volume 58, Issue 10, Pages 712-716Publisher
BMJ PUBLISHING GROUP
DOI: 10.1136/jmedgenet-2020-107137
Keywords
genetics; medical; gain of function mutation; mutation; missense
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Funding
- Baylor-Hopkins Center for Mendelian Genomics [NHGRI UM1 HG006542]
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Rare de novo variants in LMBRD2 were identified in 10 individuals with developmental delay, intellectual disability, thin corpus callosum, microcephaly and seizures. These findings suggest that these variants may cause a previously unrecognized early-onset neurodevelopmental disorder.
Objective To determine the potential disease association between variants in LMBRD2 and complex multisystem neurological and developmental delay phenotypes. Methods Here we describe a series of de novo missense variants in LMBRD2 in 10 unrelated individuals with overlapping features. Exome sequencing or genome sequencing was performed on all individuals, and the cohort was assembled through GeneMatcher. Results LMBRD2 encodes an evolutionary ancient and widely expressed transmembrane protein with no known disease association, although two paralogues are involved in developmental and metabolic disorders. Exome or genome sequencing revealed rare de novo LMBRD2 missense variants in 10 individuals with developmental delay, intellectual disability, thin corpus callosum, microcephaly and seizures. We identified five unique variants and two recurrent variants, c.1448G>A (p.Arg483His) in three cases and c.367T>C (p.Trp123Arg) in two cases. All variants are absent from population allele frequency databases, and most are predicted to be deleterious by multiple in silico damage-prediction algorithms. Conclusion These findings indicate that rare de novo variants in LMBRD2 can lead to a previously unrecognised early-onset neurodevelopmental disorder. Further investigation of individuals harbouring LMBRD2 variants may lead to a better understanding of the function of this ubiquitously expressed gene.
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