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肌肉生长抑制素基因的研究进展 |
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姜运良 连正兴 李宁 吴常信
摘 要:肌肉生长抑制素又称GDF-8,属TGF-β超家族,是骨骼肌生长的负调控因子。最早在小鼠中发现该基因的突变可导致骨骼肌肥大。随后的研究表明,肉牛的双肌现象也是该因子外显子3 11bp的碱基缺失或保守的单个碱基的突变所造成的。对人肌肉生长抑制素基因的研究表明,它包括3个外显子和2个内含子,在人的骨骼肌中特异性地表达,产物为成熟糖蛋白。目前,该基因已分别在人、牛和猪的染色体上定位。猪的肌肉生长抑制素基因的表达在仔猪出生时显著下降,而且其表达在生后仔猪的乳腺中也可检测到。 关键词: 肌肉生长抑制素; TGF-β超家族;双肌 中图分类号: Q956 文献标识码: A 文章编号: 0253-9772(2000)02-0119-03
Myostatin:A Negative Regulator of Skeletal Muscle Mass
JIANG Yun-liang (College of Animal Science & Technology,Shandong Agricultural University,Taian 271018) LIAN Zheng-xing LI Ning (National Laboratory for Agro-Biotechnology,China Agricultural University,Beijing 100094) WU Chang-xin (College of Animal Science & Technology,China Agricultural University,Beijing 100094)
Abstract: Myostatin, a member of the transforming growth factor-βsuperfamily,is a genetic determinant of skeletal muscle growth.Mice and cattle with loss of function mutation of this gene have marked muscle hypertrophy.Myostatin is mapped to 2q33.2 in human,2q11or 2q14~15 in cattle and 15q2.3 in pig.The genomic structure of human myostatin gene contains 3 exons and 2 introns,with the whole length of about 7.7kb.Myostatin is expressed uniquely in the human skeletal muscle as a 26 kDa mature glycoprotein and secreted into the plasma. In Texel “double-muscle” sheep,no missense mutations were detected,but by linkage analysis a QTL flanking myostatin was associated with this trait.In porcine tissues,1.5 and 0.8kb transcripts were detected by Northern blot,myostatin peaks prenatally and it s higher expression is associated with low birth weight. Key words: myostatin; transforming growth factor-β; double muscle
肌肉生长抑制素又称GDF-8(growth differentiation factor 8),属TGF-β(transforming growth factor beta,转化生长因子)超家族。这是一类分泌型的多肽,在细胞间的通讯中起介导作用。它可以改变成纤维细胞的表型,抑制细胞的过度增殖,诱导软骨形成的分化以及具有免疫抑制作用等。该超家族中除了TGF-β家族的成员以外,还包括Inhibin家族、 [1] [2] [3] 下一页 上一个医学论文: CAAT结合蛋白CBF在转录中的作用 下一个医学论文: 昆虫中的mariner类转座子
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