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HIC2 is a Novel Dosage-Dependent Regulator of Cardiac Development Located Within the Distal 22q11 Deletion Syndrome Region

Circ Res. 2014 Apr 18. [Epub ahead of print]

Authors/Editors: Dykes IM, Lammerts van Bueren K, Ashmore RJ, Floss T, Wurst W, Szumska D, Bhattacharya S, Scambler PJ.
Publication Date: 2014

2014_04_dykes

Abstract

RATIONALE:
22q11 deletion syndrome arises from recombination between low copy repeats on chromosome 22. Typical deletions result in hemizygosity for TBX1 associated with congenital cardiovascular disease. Deletions distal to the typically deleted region result in a similar cardiac phenotype but lack extra-cardiac features of the syndrome suggesting that a second haploinsufficient gene maps to this interval.

OBJECTIVE:
The transcription factor HIC2 is lost in most distal deletions as well as a minority of typical deletions. We used mouse models to test the hypothesis that HIC2 hemizygosity causes congenital heart disease.

METHODS AND RESULTS:
We created a genetrap mouse allele of Hic2. The genetrap reporter was expressed in the heart throughout the key stages of cardiac morphogenesis. Homozygosity for the genetrap allele was embryonic lethal before embryonic day E10.5 while the heterozygous condition exhibited a partially penetrant late lethality. One third of heterozygous embryos had a cardiac phenotype. Magnetic resonance imaging demonstrated a ventricular septal defect with overriding aorta. Conditional targeting indicated a requirement for Hic2 within the Nkx2.5+ and Mesp1+ cardiovascular progenitor lineages. Microarray analysis revealed increased expression of Bmp10.

CONCLUSIONS:
Our results demonstrate a novel role for Hic2 in cardiac development. Hic2 is the first gene within the distal 22q11 interval to have a demonstrated haploinsufficient cardiac phenotype in mice. Together our data suggests HIC2 haploinsufficiency likely contributes to the cardiac defects seen in distal 22q11 deletion syndrome.

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