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Identification of a differentially expressed gene PPP1CB between porcine Longissimus dorsi of Meishan and Large WhitexMeishan hybrids.

Acta Biochim. Biophys. Sin. (Shanghai). 2006 Jul;38(7):450-6. doi:10.1111/j.1745-7270.2006.00187.x
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摘要


To study the molecular basis of heterosis, suppression subtractive hybridization was used to investigate the differences in gene expression between porcine Longissimus dorsi of F1 hybrids Large WhitexMeishan and their female parents Meishan. From two specific subtractive cDNA libraries, the clones selected by reverse Northern high-density blot screening were chosen to clone full-length cDNA by rapid amplification of cDNA ends. An expression-upregulated gene for Meishan skeletal muscle, designated protein phosphatase 1, catalytic subunit, beta isoform (PPP1CB), was identified. Porcine PPP1CB contains an open reading frame encoding 327 amino acid residues with 13 and 1763 nucleotides in the 5' and 3' untranslated regions, respectively. A DNA fragment of 721 nucleotides was amplified and a mutation that creates/disrupts a restriction site for endonuclease RsaI was found. The derived amino acid sequence of PPP1CB has high homology with the PPP1CB of three species, Mus musculus (99%), human (99%) and mouse (100%). The tissue expression analysis indicated that the swine PPP1CB gene is generally expressed in most tissues. The possible role of PPP1CB and its relation to porcine heterosis are discussed.

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