Open AccessDecreased Triadin and Increased Calstabin2 Expression in Great Danes with Dilated Cardiomyopathy
Author(s) -
Oyama M.A.,
Chittur S.V.,
Reynolds C.A.
Publication year - 2009
Publication title -
journal of veterinary internal medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.356
H-Index - 103
eISSN - 1939-1676
pISSN - 0891-6640
DOI - 10.1111/j.1939-1676.2009.0360.x
Subject(s) - ryanodine receptor , ryanodine receptor 2 , medicine , downregulation and upregulation , dilated cardiomyopathy , microarray , gene expression profiling , gene expression , gene , biology , pathology , endocrinology , genetics , heart failure , receptor
Background: Dilated cardiomyopathy (DCM) is a common cardiac disease of Great Dane dogs, yet very little is known about the underlying molecular abnormalities that contribute to disease. Objective: Discover a set of genes that are differentially expressed in Great Dane dogs with DCM as a way to identify candidate genes for further study as well as to better understand the molecular abnormalities that underlie the disease. Animals: Three Great Dane dogs with end‐stage DCM and 3 large breed control dogs. Methods: Prospective study. Transcriptional activity of 42,869 canine DNA sequences was determined with a canine‐specific oligonucleotide microarray. Genome expression patterns of left ventricular tissue samples from affected Great Dane dogs were evaluated by measuring the relative amount of complementary RNA hybridization to the microarray probes and comparing it with expression from large breed dogs with noncardiac disease. Results: Three hundred and twenty‐three transcripts were differentially expressed (≥2‐fold change). The transcript with the greatest degree of upregulation (+61.3‐fold) was calstabin2 (FKBP12.6), whereas the transcript with the greatest degree of downregulation (−9.07‐fold) was triadin. Calstabin2 and triadin are both regulatory components of the cardiac ryanodine receptor (RyR2) and are critical to normal intracellular Ca 2+ release and excitation‐contraction coupling. Conclusion and clinical importance: Great Dane dogs with DCM demonstrate abnormal calstabin2 and triadin expression. These changes likely affect Ca 2+ flux within cardiac cells and may contribute to the pathophysiology of disease. Microarray‐based analysis identifies calstabin2, triadin, and RyR2 function as targets of future study.