Evolution of the integral membrane desaturase gene family in moths and flies
| Autor: | Kyung Man You, Rasmus Nielsen, Claire-Lise Rosenfield, Seong Eun Jeong, Douglas C. Knipple |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Nonsynonymous substitution
Fatty Acid Desaturases Male Models Molecular DNA Complementary Amino Acid Motifs Molecular Sequence Data Genes Insect Biology Conserved sequence Evolution Molecular Species Specificity Phylogenetics Genetics Gene family Animals Drosophila Proteins Amino Acid Sequence Sex Attractants Conserved Sequence Phylogeny Sequence Homology Amino Acid fungi biology.organism_classification Protein Structure Tertiary Lepidoptera Drosophila melanogaster Sex pheromone Multigene Family Pheromone Insect Proteins Female Synonymous substitution Research Article |
| Zdroj: | Genetics. 162(4) |
| ISSN: | 0016-6731 |
| Popis: | Lepidopteran insects use sex pheromones derived from fatty acids in their species-specific mate recognition system. Desaturases play a particularly prominent role in the generation of structural diversity in lepidopteran pheromone biosynthesis as a result of the diverse enzymatic properties they have evolved. These enzymes are homologous to the integral membrane desaturases, which play a primary role in cold adaptation in eukaryotic cells. In this investigation, we screened for desaturase-encoding sequences in pheromone glands of adult females of eight lepidopteran species. We found, on average, six unique desaturase-encoding sequences in moth pheromone glands, the same number as is found in the genome database of the fly, Drosophila melanogaster, vs. only one to three in other characterized eukaryotic genomes. The latter observation suggests the expansion of this gene family in insects before the divergence of lepidopteran and dipteran lineages. We present the inferred homology relationships among these sequences, analyze nonsynonymous and synonymous substitution rates for evidence of positive selection, identify sequence and structural correlates of three lineages containing characterized enzymatically distinct desaturases, and discuss the evolution of this sequence family in insects. |
| Databáze: | OpenAIRE |
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