Beukeboom Leo W, Kamping Albert
Evolutionary Genetics, Center for Ecological and Evolutionary Studies, University of Groningen, NL-9750 AA Haren, The Netherlands.
Genetics. 2006 Feb;172(2):981-9. doi: 10.1534/genetics.105.044743. Epub 2005 Oct 11.
The parasitoid wasp Nasonia vitripennis is an emerging model organism for developmental and behavioral genetics. It reproduces by haplodiploidy; males typically develop parthenogenetically from haploid eggs and females from fertilized diploid eggs. A polyploid mutant strain is available in which females are triploid and lay haploid and diploid eggs that normally develop into males when unfertilized. In contrast to previous reports, approximately 2% of triploid females were found to occasionally produce daughters as well as gynandromorphs from diploid unfertilized eggs. Daughter production increased with age and differed among familial lineages. This is the first report of parthenogenetic female development in Nasonia. The results show that a paternally provided genome is not required for femaleness and call for modifications of existing models of sex determination in Nasonia.
寄生蜂丽蝇蛹集金小蜂是发育遗传学和行为遗传学领域新兴的模式生物。它通过单双倍体生殖;雄性通常由单倍体卵孤雌发育而来,雌性则由受精的二倍体卵发育而来。现有一个多倍体突变株系,其中雌性为三倍体,能产下单倍体和二倍体卵,这些卵在未受精时通常发育成雄性。与之前的报道不同,发现约2%的三倍体雌性偶尔也能从未受精的二倍体卵中产生雌性后代以及雌雄嵌合体。雌性后代的产生随年龄增加,且在不同家族谱系中存在差异。这是关于丽蝇蛹集金小蜂孤雌生殖雌性发育的首次报道。结果表明,雌性发育并不需要父本提供的基因组,这就需要对丽蝇蛹集金小蜂现有的性别决定模型进行修正。