Abstract
While the two amylase genes ofDrosophila melanogaster are intronless, the three genes ofD. pseudoobscura harbor a short intron. This raises the question of the common structure of theAmy gene in Drosophila species. We have investigated the presence or absence of an intron in the amylase genes of 150 species of Drosophilids. Using polymerase chain reaction (PCR), we have amplified a region that surrounds the intron site reported inD. pseudoobscura and a few other species. The results revealed that most species contain an intron, with a variable size ranging from 50 to 750 bp, although the very majoritary size was around 60–80 bp. Several species belonging to different lineages were found to lack an intron. This loss of intervening sequence was likely due to evolutionarily independent and rather frequent events. Some other species had both types of genes: In theobscura group, and to a lesser extent in theananassae subgroup, intronless copies had much diverged from intron-containing genes. Base composition of short introns was found to be variable and correlated with that of the surrounding exons, whereas long introns were all A-T rich. We have extended our study to non-Drosophilid insects. In species from other orders of Holometaboles, Lepidoptera and Hymenoptera, an intron was found at an identical position in theAmy gene, suggesting that the intron was ancestral.
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Correspondence to: J-L. Da Lage
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Da Lage, JL., Wegnez, M. & Cariou, ML. Distribution and evolution of introns in drosophila amylase genes. J Mol Evol 43, 334–347 (1996). https://doi.org/10.1007/BF02339008
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DOI: https://doi.org/10.1007/BF02339008