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. 1992 Nov;132(3):789–797. doi: 10.1093/genetics/132.3.789

The Evolution of Duplicate Glyceraldehyde-3-Phosphate Dehydrogenase Genes in Drosophila

K M Wojtas 1, L V Kalm 1, J R Weaver 1, D T Sullivan 1
PMCID: PMC1205215  PMID: 1468631

Abstract

In Drosophila melanogaster there are two genes which encode the enzyme glyceraldehyde-3-phosphate dehydrogenase (GAPDH), Gapdh-43E and Gapdh-13F. We have shown that Gapdh-43E codes for the GAPDH subunit with an apparently larger molecular weight while Gapdh-13F encodes the GAPDH subunit having an apparently smaller molecular weight. Immunoblots of sodium dodecyl sulfate gels were used to survey species from throughout the genus and results indicated that two classes of GAPDH subunits are present only in Drosophila species of the melanogaster and takahashi subgroups of the melanogaster group. Only the smaller subunit is found in species of the obscura group while all other species have only a large subunit. Drosophila hydei was analyzed at the DNA level as a representative species of the subgenus Drosophila. The genome of this species has a single Gapdh gene which is localized at a cytogenetic position likely to be homologous to Gapdh-43E of D. melanogaster. Comparison of its sequence with the sequence of the D. melanogaster Gapdh genes indicates that the two genes of D. melanogaster are more similar to one another than either is to the gene from D. hydei. The Gapdh gene from D. hydei contains an intron following codon 29. Neither Gapdh gene of D. melanogaster has an intron within the coding region. Southern blots of genomic DNA were used to determine which species have duplicate Gapdh genomic sequences. Gene amplification was used to determine which species have a Gapdh gene that is interrupted by an intron. Species of the subgenus Drosophila have a single Gapdh gene with an intron. Species of the willistoni and saltans groups have a single Gapdh gene that does not contain an intron. Species of the obscura and melanogaster groups have two Gapdh genes neither of which have an intron. In Drosophila pseudoobscura these are located at cytogenetic positions homologous to those of D. melanogaster. Therefore, the simplest model for the evolution of the Gapdh genes proposes that the intron in the Gapdh gene was lost early in the Sophophoran lineage. Later in the Sophophoran lineage, at a point leading to the obscura and melanogaster groups, a duplication of the Gapdh gene occurred.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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