Abstract:
:In mice, dystrophic cardiovascular calcification (DCC) is controlled by a major locus on proximal mouse chromosome 7 named Dyscalc1. Here we present a strategy that combines in silico analysis, expression analysis, and extensive sequencing for ultrafine mapping of the Dyscalc1 locus. We subjected 15 laboratory mouse strains to freeze-thaw injury of the heart, and association with respective genotypes allowed condensation of the Dyscalc1 locus to 1 Mb. Within this region, 51 known and predicted genes were studied in DCC-susceptible C3H/He and DCC-resistant C57BL/6 mice with respect to mRNA expression in response to injury. Five genes displayed differential expression. Genotyping of seven novel single nucleotide polymorphisms (SNPs) within these genes revealed an 80-Kb region in NZB mice that were found positive for calcification though carrying otherwise alleles from DCC-resistant mice. This microheterogeneity in NZB mice was evolutionary conserved in all DCC-susceptible mouse strains and contains the genes EMP-3, BC013491, and Abcc6 (partially). The flanking SNPs are rs3703247 and NT_039420.5_2757991. mRNA levels of EMP-3 were found to be upregulated in response to injury in both C57BL/6 and C3H/He mice. Sequencing of EMP-3 revealed an SNP leading to an amino acid substitution (p.T153I) that was found in all mouse strains susceptible for DCC but not in resistant strains such as C57BL/6 mice. Thus, the p.T153I changes might affect the biological function of EMP-3 gene product after injury. Using this combined approach, we ultrafine-mapped the Dyscalc1 locus to an 80-Kb region and identified EMP-3 as a new candidate gene for DCC.
journal_name
Physiol Genomicsjournal_title
Physiological genomicsauthors
Aherrahrou Z,Doehring LC,Kaczmarek PM,Liptau H,Ehlers EM,Pomarino A,Wrobel S,Götz A,Mayer B,Erdmann J,Schunkert Hdoi
10.1152/physiolgenomics.00133.2006subject
Has Abstractpub_date
2007-01-17 00:00:00pages
203-12issue
2eissn
1094-8341issn
1531-2267pii
00133.2006journal_volume
28pub_type
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