Abstract:
BACKGROUND:TOP2B encodes type II topoisomerase beta, which controls topological changes during DNA transcription. TOP2B is expressed in the developing nervous system and is involved in brain development and neural differentiation. Recently, a de novo missense TOP2B variant (c.187C>T) has been identified in an individual with neurodevelopmental disorder (NDD). However, the association between TOP2B variants and NDDs remains uncertain. METHODS:Trio-based whole-exome sequencing was performed on a 7-year-old girl, presenting muscle hypotonia, stereotypic hand movements, epilepsy, global developmental delay, and autism spectrum disorder. Brain magnetic resonance images were normal. She was unable to walk independently and spoke no meaningful words. RESULTS:We found a de novo variant in TOP2B (NM_001330700.1:c.187C>T, p.(His63Tyr)), which is identical to the previous case. The clinical features of the two individuals with the c.187C>T variant overlapped. CONCLUSION:Our study supports the finding that TOP2B variants may cause NDDs.
journal_name
Mol Genet Genomic Medjournal_title
Molecular genetics & genomic medicineauthors
Hiraide T,Watanabe S,Matsubayashi T,Yanagi K,Nakashima M,Ogata T,Saitsu Hdoi
10.1002/mgg3.1145subject
Has Abstractpub_date
2020-03-01 00:00:00pages
e1145issue
3issn
2324-9269journal_volume
8pub_type
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