Ogura Keiji, Woodruff R C, Itoh Masanobu, Boussy Ian A
Department of Biology, Loyola University of Chicago, IL 60626, USA.
Genes Genet Syst. 2007 Dec;82(6):479-87. doi: 10.1266/ggs.82.479.
A latitudinal cline in characteristics associated with the P DNA transposable element is well known in eastern Australian populations of Drosophila melanogaster. In order to survey the long-term patterns of P-M system characteristics and genomic P element content, we established 292 isofemale lines from 54 localities in 1996-1997 and evaluated them for gonadal dysgenesis (GD) sterility and the ratio of KP to full-size P elements (KP/FP ratio). The results were compared to those from collections made in 1983-1986 and 1991-1994. Over 10-14 years, 1) the cross A GD scores of the northern-middle populations declined dramatically; 2) the clinal pattern of the cross A* GD scores did not change; 3) the latitudinal pattern of the KP/FP ratio did not change. The results suggest that only a few P elements determine P-M characteristics and that there has been selection for genomes with fewer active P elements, but not for a great change in proportions of size classes.
在澳大利亚东部的黑腹果蝇种群中，与P DNA转座因子相关的特征存在纬度梯度变化，这是广为人知的。为了调查P-M系统特征和基因组P因子含量的长期模式，我们在1996 - 1997年从54个地点建立了292个同雌系，并对它们的性腺发育不全（GD）不育以及KP与全长P因子的比例（KP/FP比例）进行了评估。将结果与1983 - 1986年和1991 - 1994年采集的数据进行了比较。在10 - 14年的时间里，1）中北部种群的杂交A的GD评分急剧下降；2）杂交A*的GD评分的梯度模式没有变化；3）KP/FP比例的纬度模式没有变化。结果表明，只有少数P因子决定P-M特征，并且存在对具有较少活性P因子的基因组的选择，但大小类别的比例没有发生很大变化。
