Kao WY, Bergtrom G. Sequences of globin 6 gene alleles and linkage of globin 6 and 7B genes in the insect Chironomus thummi thummi.
Gene 1995;
153:209-13. [PMID:
7875590 DOI:
10.1016/0378-1119(94)00773-l]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The purpose of this study was to isolate the stage-specifically expressed Chironomus thummi thummi globin-encoding gene (Gb) 6 (ctt-6). The final product of this gene is hemoglobin (Hb) CTT-VI, a protein that is phylogenetically most closely related to Hb CTT-VIIB. In the absence of chromosomal rearrangement, genes of immediate common ancestry should be closely linked. This was shown for a genomic clone containing the Gb ctt-3 and ctt-4 genes (encoding Hb CTT-III and CTT-IV, respectively), and another clone containing the Gb ctt-2 beta and ctt-9a genes (encoding Hb CTT-II beta and CTT-IXa, respectively). We report the isolation and sequence of two alleles of Gb ctt-6 found on independent genomic clones screened with a ctt-6 cDNA, and the predicted linkage of Gb ctt-6 and a ctt-7B gene. The latter, designated Gb ctt-7B9/5, is unusual in being a chimera of two previously reported Gb ctt-7B genes. The result of a partial gene conversion or an unequal crossover between oppositely oriented genes, the chimeric ctt-7B9/5 represents either an additional ctt-7B locus or a 7B haplotype.
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