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.
Keywords: NCAPD2 gene; congenital primary microcephaly; sanger sequencing; whole exome sequencing.
© 2019 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.