Genes encoding the various isoforms of actin. In Drosophila, for example, actin genes have been localized at six different chromosomal sites. Two genes encode cytoplasmic actins, while the other four encode muscle actins. The amino acid– encoding segments of the different actin genes have very similar compositions, but the segments specifying the trailers (q.v.) differ considerably in nucleotide sequences.
Subjects: Genetics and Genomics.