A novel homozygous splice-site variant of NCAPD2 gene identified in two siblings with primary microcephaly: The second case report.

Clin Genet

Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China.

Published: July 2019

Here we describe the second case of primary microcephaly caused by a novel homozygous splice-site variant at the NCAPD2 gene. The proband was born with microcephaly, and developed intellectual disability. Whole exome sequencing identified a canonical splice-site variant, c.3477+2T>C, at the NCAPD2 gene. Sanger sequencing showed that the proband and her sibling, a symptomatic fetus, carried a homozygous c.3477+2T>C variant, while the unaffected parents were heterozygous and her younger brother had wild-type alleles. To date, only one case of primary microcephaly with a homozygous splice-site pathogenic variant at the NCAPD2 gene has been reported. Our study of two siblings provides additional evidence that NCAPD2 is a causative gene of primary microcephaly. This finding adds new knowledge in the etiology of microcephaly and contributes to more accurate counseling of affected families.

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http://dx.doi.org/10.1111/cge.13559DOI Listing

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