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Human Cytoplasmic Actin Proteins Are Encoded by a Multigene Family

机译:人类细胞质肌动蛋白由一个多基因家族编码。

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We characterized nine human actin genes that we isolated (Engel et al., Proc. Natl. Acad. Sci. U.S.A. >78:4674-4678, 1981) from a library of cloned human DNA. Measurements of the thermal stability of hybrids formed between each cloned actin gene and α-, β-, and γ-actin mRNA demonstrated that only one of the clones is most homologous to sarcomeric actin mRNA, whereas the remaining eight clones are most homologous to cytoplasmic actin mRNA. By the following criteria we show that these nine clones represent nine different actin gene loci rather than different alleles or different parts of a single gene: (i) the restriction enzyme maps of the coding regions are dissimilar; (ii) each clone contains sufficient coding region to encode all or most of an entire actin gene; and (iii) each clone contains sequences homologous to both the 5′ and 3′ ends of the coding region of a cloned chicken β-actin cDNA. We conclude, therefore, that the human cytoplasmic actin proteins are encoded by a multigene family.
机译:我们对从克隆的人类DNA库中分离出的九种人类肌动蛋白基因进行了表征(Engel等人,美国国家科学院院刊,> 78 :4674-4678,1981)。测量每个克隆的肌动蛋白基因与α-,β-和γ-肌动蛋白mRNA之间形成的杂种的热稳定性,表明只有一个克隆与肌节肌动蛋白mRNA最同源,而其余八个克隆与细胞质最同源肌动蛋白mRNA。通过以下标准,我们表明这9个克隆代表9个不同的肌动蛋白基因位点,而不是单个基因的不同等位基因或不同部分:(i)编码区的限制性酶图谱不相似; (ii)每个克隆均包含足够的编码区,以编码整个或大部分肌动蛋白基因; (iii)每个克隆含有与克隆的鸡β-肌动蛋白cDNA的编码区的5'和3'端同源的序列。因此,我们得出结论,人胞质肌动蛋白是由多基因家族编码的。

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