Chaboissier M C, Lemeunier F, Bucheton A
Centre de Génétique Moléculaire, CNRS, Gif-sur-Yvette, France.
Genet Res. 1995 Jun;65(3):167-74. doi: 10.1017/s0016672300033255.
The I factor is a LINE-like transposable element responsible for the I-R system of hybrid dysgenesis in Drosophila melanogaster. Inducer strains of this species contain several I factors whereas reactive strains do not. I factors are stable in inducer strains, but transpose at high frequency in the germ-line of females, known as SF females, produced by crossing reactive females and inducer males. Various abnormalities occur in SF females, most of which result from this high rate of transposition. We report here that recombination is increased in the germ-line of these females. This is a new characteristic of the I-R system of hybrid dysgenesis that might also be associated with transposition of the I factor.
I因子是一种类似LINE的转座元件，负责果蝇杂交不育的I-R系统。该物种的诱导品系含有多个I因子，而反应品系则没有。I因子在诱导品系中是稳定的，但在由反应性雌蝇与诱导性雄蝇杂交产生的雌性生殖系（称为SF雌蝇）中高频转座。SF雌蝇会出现各种异常，其中大多数是由这种高转座率导致的。我们在此报告，这些雌蝇的生殖系中重组增加。这是杂交不育I-R系统的一个新特征，可能也与I因子的转座有关。
