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• W1999848553 abstract "Whereas the negative muscle regulator myostatin (MSTN) in mammals is almost exclusively expressed in the muscle by a single encoding gene, teleost fish possess at least two MSTN genes which are differentially expressed in both muscular and non-muscular tissues. Duplicated MSTN-1 genes have previously been identified in the tetraploid salmonid genome. From Atlantic salmon we succeeded in isolating the paralogous genes of MSTN-2, which shared about 70% identity with MSTN-1a and -1b. The salmon MSTN-2a cDNA encoded a predicted protein of 363 residues and included the conserved C-terminal bioactive domain. MSTN-2a seemed to be primarily expressed in the brain, and a functional role of teleost MSTN-2 in the neurogenesis similar to the inhibitory action of the closely related GDF-11 in the mammalian brain was proposed. In contrast, a frame-shift mutation in exon 1 of salmon MSTN-2b would lead to the synthesis of a putatively non-functional truncated protein. The absence of processed MSTN-2b mRNA in the examined tissues indicated that this gene has become a non-functional pseudogene. The differential, but partially overlapping, expression patterns of salmon MSTN-2a, -1a and -1b in muscular and non-muscular tissues are probably due to the different arrangement of the potential cis-acting regulatory elements identified in their putative promoter regions. Single and paired E-boxes in the MSTN-1b promoter were shown to bind both homo-and hetero-dimers of the myogenic regulatory factor MyoD and E47 in vitro of importance for initiating the myogenic program. Analyses of nucleotide substitution patterns indicated that the teleost MSTNs essentially have evolved under purifying selection, but a subset of amino acid sites under positive selective pressure were identified within the MSTN1 branch. The results may reflect the evolutionary forces related to adoption of the different functional roles proposed for the teleost MSTN isoforms. The phylogenetic analysis of multiple vertebrate MSTNs suggested at least two separate gene duplication events in the fish lineage. Linkage analysis of polymorphic microsatellites within intron 2 of salmon MSTN-1a and -1b mapped the two genes to different linkage groups in agreement with the tetraploid origin of the duplicated salmonid MSTN-1 and MSTN-2 genes." @default.
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• W1999848553 date "2007-11-01" @default.
• W1999848553 modified "2023-10-17" @default.
• W1999848553 title "Myostatin (MSTN) gene duplications in Atlantic salmon (Salmo salar): Evidence for different selective pressure on teleost MSTN-1 and -2" @default.
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• W1999848553 doi "https://doi.org/10.1016/j.gene.2007.08.008" @default.
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