Duplication of a four-gene set during the evolution of the goat beta-globin locus produced genes now expressed differentially in development.
Genomic clones which link the goat preadult (beta C) and adult (beta A) beta-globin genes have been isolated. These overlapping clones contain a previously unidentified embryonic like globin gene (epsilon III) and establish the following linkage map of eight genes in the goat beta-globin locus: epsilon I-epsilon II-psi beta X-beta C-epsilon III-epsilon IV-psi beta Z-beta A. This linkage map and the nucleotide sequence of the eight genes document a relatively recent duplication of a four-gene set: epsilon-epsilon-psi beta-beta. This duplication produced two genes (beta C and beta A) which are now expressed differentially during development. An embryonic like globin gene located downstream from beta A has also been isolated. The embryonic nature of this gene as well as the adult beta-like sequence of the goat fetal globin gene (gamma) suggest that a duplication of the four-gene set also produced the globin gene now expressed during fetal development.
D000375:Aging; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D005796:Genes; D008040:Genetic Linkage; D005914:Globins / Q000235:genetics*; D006041:Goats / Q000235:genetics*
D005914:Globins