Leiomodins: larger members of the tropomodulin (Tmod) gene family

Genomics
C A ConleyVelia M Fowler

Abstract

The 64-kDa autoantigen D1 or 1D, first identified as a potential autoantigen in Graves' disease, is similar to the tropomodulin (Tmod) family of actin filament pointed end-capping proteins. A novel gene with significant similarity to the 64-kDa human autoantigen D1 has been cloned from both humans and mice, and the genomic sequences of both genes have been identified. These genes form a subfamily closely related to the Tmods and are here named the Leiomodins (Lmods). Both Lmod genes display a conserved intron-exon structure, as do three Tmod genes, but the intron-exon structure of the Lmods and the Tmods is divergent. mRNA expression analysis indicates that the gene formerly known as the 64-kDa autoantigen D1 is most highly expressed in a variety of human tissues that contain smooth muscle, earning it the name smooth muscle Leiomodin (SM-Lmod; HGMW-approved symbol LMOD1). Transcripts encoding the novel Lmod gene are present exclusively in fetal and adult heart and adult skeletal muscle, and it is here named cardiac Leiomodin (C-Lmod; HGMW-approved symbol LMOD2). Human C-Lmod is located near the hypertrophic cardiomyopathy locus CMH6 on human chromosome 7q3, potentially implicating it in this disease. Our data demonstrate that t...Continue Reading

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