PMID: 2511015Nov 6, 1989Paper

Alpha-actinin expression during avian myogenesis in vivo. Evidence for the existence of an embryo-specific isoform of alpha-actinin

European Journal of Biochemistry
R KobayashiY Tashima

Abstract

The isoforms of skeletal muscle alpha-actinin present during chick embryogenesis were analyzed by two-dimensional electrophoresis in combination with the immunoblot technique. Chicken embryonic muscles at 8-15 days contain an embryo-specific isoform of alpha-actinin. The embryonic alpha-actinin isoform has a molecular mass of 112 kDa and an isoelectric point of 5.8, whereas the values for the adult isoform of alpha-actinin were 100 kDa and 5.85, respectively. To characterize the two classes of alpha-actinin polypeptides we have compared the two proteins by 125I-labeled two-dimensional peptide mapping. The embryonic isoform is highly similar to, but exhibited extensive peptide differences to, the adult isoform of alpha-actinin. The developmental sequence of the expression of the alpha-actinins was also studied. In extracts of skeletal muscle from 8-10-day-old embryos, only the embryonic isoform was detected. In extracts from 15-day-old embryos, both the embryonic and the adult isoforms coexisted. However by 21 days, the embryonic isoform had disappeared and only the adult isoform was detected. These data suggested that the embryonic and the adult isoform of alpha-actinins are distinct proteins and that during skeletal myogenesis...Continue Reading

References

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Citations

Jun 29, 2004·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Daniel G MacArthur, Kathryn N North
Sep 1, 1990·Current Eye Research·P G FitzGerald, J Casselman

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