Rigaud T, Juchault P
Université de Poitiers, Laboratoire de Biologie Animale, URA CNRS 1452, France.
Genetics. 1993 Feb;133(2):247-52. doi: 10.1093/genetics/133.2.247.
Female sex determination in the pill bug Armadillidium vulgare is frequently under the control of feminizing parasitic sex factors (PSF). One of these PSF is an intracytoplasmic Wolbachia-like bacterium (F), while the other (f) is suspected of being an F-bacterial DNA sequence unstably integrated into the host genome. In most wild populations harboring PSF, all individuals are genetic males (ZZ), and female phenotypes occur only due to the presence of PSF which overrides the male determinant carried by the Z chromosome (females are thus ZZ +F or ZZ +f neo-females). Here we report the effects of the conflict between these PSF and a dominant autosomal masculinizing gene (M) on phenotypes. The M gene is able to override the feminizing effect of the f sex factor and, consequently, male sex may be restored. However, M is unable to restore male sex when competing with the F bacteria. It seems that the main effect of M is to delay the expression of F bacteria slightly, inducing intersex phenotypes. Most of these intersexes are functional females, able to transmit the masculinizing gene. The frequency of M and its effects on the sex ratio in wild populations are discussed.
鼠妇（Armadillidium vulgare）的雌性性别决定常常受雌性化寄生性性别因子（PSF）的控制。其中一种PSF是一种胞质内类似沃尔巴克氏体的细菌（F），而另一种（f）则被怀疑是不稳定整合到宿主基因组中的F细菌DNA序列。在大多数含有PSF的野生种群中，所有个体都是遗传雄性（ZZ），只有在PSF存在时才会出现雌性表型，PSF会覆盖Z染色体携带的雄性决定因子（因此雌性为ZZ +F或ZZ +f新雌性）。在此我们报告了这些PSF与一个显性常染色体雄性化基因（M）之间的冲突对表型的影响。M基因能够克服f性别因子的雌性化作用，因此雄性性别得以恢复。然而，当与F细菌竞争时，M无法恢复雄性性别。似乎M的主要作用是略微延迟F细菌的表达，从而诱导间性表型。这些间性个体大多是功能性雌性，能够传递雄性化基因。文中还讨论了M在野生种群中的频率及其对性别比例的影响。
