Nucleotide sequence of the human γ cytoskeletal actin mRNA: anomalous evolution of vertebrate non-muscle actin genes (original) (raw)
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The MEDIGEN Project, Department of Medicine, Stanford University School of Medicine and Veterans Administration Medical Center
Palo Alto, CA 94305, USA
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The MEDIGEN Project, Department of Medicine, Stanford University School of Medicine and Veterans Administration Medical Center
Palo Alto, CA 94305, USA
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The MEDIGEN Project, Department of Medicine, Stanford University School of Medicine and Veterans Administration Medical Center
Palo Alto, CA 94305, USA
*To whom correspondence should be addressed
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Harry P. Erba, Peter Gunning, Larry Kedes, Nucleotide sequence of the human γ cytoskeletal actin mRNA: anomalous evolution of vertebrate non-muscle actin genes, Nucleic Acids Research, Volume 14, Issue 13, 11 July 1986, Pages 5275–5294, https://doi.org/10.1093/nar/14.13.5275
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Abstract
Two distinct, but iso-coding. γ non-muscle actin cDNAs were isolated from an SV40-transformed human fibroblast library. The complete nucleotide sequence of the human γ non-muscle actin eDNAs indicates that they may have arisen from polymorphic alleles. By using genomic DNA and cellular RNA transfer blots, we demonstrate that the 3′ untranslated region (UTR) of the γ actin mRNA consists of an evolutionanly conserved 5′ and more divergent 3′ segments. In fact, the conserved segment of the 3′ UTR detects a single- copy sequence in the chicken genome and a 20S RNA transcript in chicken non-muscle tissues. The coding regions of these cDNAs were compared with those of other vertebrate non-muscle actin genes. Surprisingly, the percentage of silent base substitutions between the human β and γ actin coding regions is anomalously low and indicates greater sequence conservation than would be expected for a gene pair which arose during pre-avian evolution. We discuss gene conversion and recent selective pressure as possible explanations of the apparently anomalous evolution of the γ non-muscle actin gene.
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