A site specific increase in recombination in Drosophila ananassae.

Abstract

The e 65 pi; bri ru stock of Drosophila ananassae produced an extremely high rate of recombination in males when made heterozygous with any one of the wild type stocks. We analyzed and characterized the genetic factors which caused this phenomenon. We show that the second chromosome of the e 65 pi; bri ru stock carries an enhancer of male recombination. The enhancer, En(2)-ep, is located between Om(2C) and Arc. The enhancement of meiotic recombination both in males and females was also observed at the specific region between Om(2C) and Arc on 2L. The magnitude of increased recombination was 30~40 fold in males and 13~30 fold in females. The relation between the hotspot of recombination in both sexes and the enhancer of male recombination is discussed.

Genome size diversity in the family Drosophilidae

“…There is a large literature available for this species (Nishinokubi et al, 2003;Tobari et al 1993;Yamada et al, 2002) and an active research community, particularly in Japan. A characteristic of D. ananassae unique among Drosophila species is that males undergo a significant level of recombination (Matsuda et al 1993;Sato et al, 2000). The data available suggest that the genome of D. ananassae is similar in content and size to that of D. melanogaster and D. pseudoobscura (Powell 1997), making whole genome sequencing technically feasible.…”

Male recombination in Brazilian populations ofDrosophila ananassae

“…The frequency of male exchange varies greatly between strains, depending on the genetic background (Hinton 1970;Moriwaki et al 1979). It is usually considerably less that in females, although some strains are known in which the frequency of male and female exchanges, between a given pair of markers, can almost be the same (Sato et al 2000).…”