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Exp Mol Pathol. 2015 Apr;98(2):164-72. doi: 10.1016/j.yexmp.2015.01.015. Epub 2015 Feb 7.

Dsp rul: a spontaneous mouse mutation in desmoplakin as a model of Carvajal-Huerta syndrome.

Author information

1
The Jackson Laboratory, Bar Harbor, ME, USA. Electronic address: herbert.pratt@jax.org.
2
The Jackson Laboratory for Genomic Medicine, Farmington, CT, USA.
3
The Jackson Laboratory, Bar Harbor, ME, USA.
4
Dept. of Dermatology, University of Connecticut Health Center, Farmington, CT, USA.
5
Pat and Jim Calhoun Cardiology Center, University of Connecticut Health Center, Farmington, CT, USA.
6
Dept. of Physiology, Development, and Neuroscience, University of Cambridge, Cambridge, UK.

Abstract

Studies of spontaneous mutations in mice have provided valuable disease models and important insights into the mechanisms of human disease. Ruffled (rul) is a new autosomal recessive mutation causing abnormal hair coat in mice. The rul allele arose spontaneously in the RB156Bnr/EiJ inbred mouse strain. In addition to an abnormal coat texture, we found diffuse epidermal blistering, abnormal electrocardiograms (ECGs), and ventricular fibrosis in mutant animals. Using high-throughput sequencing (HTS) we found a frameshift mutation at 38,288,978bp of chromosome 13 in the desmoplakin gene (Dsp). The predicted mutant protein is truncated at the c-terminus and missing the majority of the plakin repeat domain. The phenotypes found in Dsp(rul) mice closely model a rare human disorder, Carvajal-Huerta syndrome. Carvajal-Huerta syndrome (CHS) is a rare cardiocutaneous disorder that presents in humans with wooly hair, palmoplantar keratoderma and ventricular cardiomyopathy. CHS results from an autosomal recessive mutation on the 3' end of desmoplakin (DSP) truncating the full length protein. The Dsp(rul) mouse provides a new model to investigate the pathogenesis of CHS, as well as the underlying basic biology of the adhesion molecules coded by the desmosomal genes.

KEYWORDS:

Carvajal-Huerta syndrome; Dsp; Gene networks; Hair shaft; Mouse model

PMID:
25659760
PMCID:
PMC4388778
DOI:
10.1016/j.yexmp.2015.01.015
[Indexed for MEDLINE]
Free PMC Article

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