PMID: 11606186Oct 19, 2001Paper

The two myostatin genes of Atlantic salmon (Salmo salar) are expressed in a variety of tissues

European Journal of Biochemistry
T K Østbye Andersen Ø

Abstract

Two myostatin isoforms were identified in Atlantic salmon (Salmo salar) by RT-PCR, and genomic sequences encoding this negative muscle growth factor were for the first time isolated from a nonmammalian species. Salmon myostatin isoform I is transcribed in white skeletal muscle as a 2346-nucleotide mRNA species that encodes a precursor protein of 373 amino acids. Salmon myostatin I shows 93% sequence identity with isoform II which was isolated from white muscle as a partial cDNA sequence of 1409 nucleotides. In contrast to the restricted gene expression of myostatin in mammals, salmon myostatin I and II mRNAs were identified by RT-PCR in multiple tissues, including white muscle, intestine, brain, gills, tongue and eye. In addition, isoform I mRNA was found in red skeletal muscle, heart, spleen, and ovarian tissue. Using polyclonal antibodies against both isoforms, a 55-kDa precursor protein was detected by Western blot analysis in the red and white skeletal muscle, heart, intestine, and brain. Immunoreactive peptides of 35-40 kDa were identified in the gills, tongue, spleen, and head kidney, while the 25-kDa mature myostatin was found in the eye and serum, and in vitro expressed in rabbit reticulocyte lysate. Salmon myostatin wa...Continue Reading

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