Local changes in GC/AT substitution biases and in crossover frequencies on Drosophila chromosomes

Molecular Biology and Evolution
T Takano-Shimizu

Abstract

I present here evidence of remarkable local changes in GC/AT substitution biases and in crossover frequencies on Drosophila chromosomes. The substitution pattern at 10 loci in the telomeric region of the X chromosome was studied for four species of the Drosophila melanogaster species subgroup. Drosophila orena and Drosophila erecta are clearly the most closely related species pair (the erecta complex) among the four species studied; however, the overall data at the 10 loci revealed a clear dichotomy in the silent substitution patterns between the AT-biased- substitution melanogaster and erecta lineages and the GC-biased-substitution yakuba and orena lineages, suggesting two or more independent changes in GC/AT substitution biases. More importantly, the results indicated a between- loci heterogeneity in GC/AT substitution bias in this small region independently in the yakuba and orena lineages. Indeed, silent substitutions in the orena lineage were significantly biased toward G and C at the consecutive yellow, lethal of scute, and asense loci, but they were significantly biased toward A and T at sta. The substitution bias toward G and C was centered in different areas in yakuba (significantly biased at EG:165H7.3, EG:171D11.2, a...Continue Reading

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Related Concepts

Metazoa
Genome Mapping
Chromosomes
Crossing Over, Genetic
Drosophila
Phylogeny
Purine Nucleotides
Pyrimidine Nucleotides
Sequence Determinations, DNA
Base Pairing

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