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PLoS Genet. 2018 Jan 22;14(1):e1007138. doi: 10.1371/journal.pgen.1007138. eCollection 2018 Jan.

Compound heterozygous loss-of-function mutations in KIF20A are associated with a novel lethal congenital cardiomyopathy in two siblings.

Author information

1
Department of Congenital and Pediatric Cardiology, University Hospitals Leuven, Leuven, Belgium.
2
Center for Human Genetics, University Hospitals and KU Leuven, Leuven, Belgium.
3
Department of Biochemistry, University of Oxford, Oxford, United Kingdom.
4
Laboratory of Endothelial Molecular Biology, VIB Center for Cancer Biology, Department of Oncology, KU Leuven, Leuven, Belgium.
5
Department of Biology, University of Padua, Padua, Italy.

Abstract

Congenital or neonatal cardiomyopathies are commonly associated with a poor prognosis and have multiple etiologies. In two siblings, a male and female, we identified an undescribed type of lethal congenital restrictive cardiomyopathy affecting the right ventricle. We hypothesized a novel autosomal recessive condition. To identify the cause, we performed genetic, in vitro and in vivo studies. Genome-wide SNP typing and parametric linkage analysis was done in a recessive model to identify candidate regions. Exome sequencing analysis was done in unaffected and affected siblings. In the linkage regions, we selected candidate genes that harbor two rare variants with predicted functional effects in the patients and for which the unaffected sibling is either heterozygous or homozygous reference. We identified two compound heterozygous variants in KIF20A; a maternal missense variant (c.544C>T: p.R182W) and a paternal frameshift mutation (c.1905delT: p.S635Tfs*15). Functional studies confirmed that the R182W mutation creates an ATPase defective form of KIF20A which is not able to support efficient transport of Aurora B as part of the chromosomal passenger complex. Due to this, Aurora B remains trapped on chromatin in dividing cells and fails to translocate to the spindle midzone during cytokinesis. Translational blocking of KIF20A in a zebrafish model resulted in a cardiomyopathy phenotype. We identified a novel autosomal recessive congenital restrictive cardiomyopathy, caused by a near complete loss-of-function of KIF20A. This finding further illustrates the relationship of cytokinesis and congenital cardiomyopathy.

PMID:
29357359
PMCID:
PMC5794171
DOI:
10.1371/journal.pgen.1007138
[Indexed for MEDLINE]
Free PMC Article

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