Abstracts

Genetic Bases of Biodiversity

The results of two genetic-selection experiments in isogenic drosophila strains after heavy heat shock (HHS) during (+)- and (-)-selection of quantitative trait radius incompletus are represented. In control strain without HHS (a) selection was inefficient. In 1st selection experiment in the group of the descendents of the males treated by HHS, but not responded by induction of transpositions (b), selection also was inefficient. In the group of the descendents of the males treated by HHS and responded by induction of transpositions (c) selection became high efficient. It means that HHS, being non-mutagenic factor, induced the genetic variability of polygenic system of this quantitative trait through the TE transpositions and excisions. In 2nd selection experiment (+)- and (-)-selection was done in three replicates which expressed the consolidated dynamics of the both fragments. It means that the trait dynamics is mainly related with almost deterministic processes of accumulation of the active polygene alleles, but not with genetic drift. The process of the (+)- and (-)-selection of the quantitative trait “summary length of two fragments of wing broken radial vein” in drosophila isogenic strain was accompanied by change of the pattern of TE 412 genomic localization. During the 50 generations of strong truncation selection in population with effective size Ne = 160, among the 35 polymorphic (induced by HHS) segments of TE localization, 26 expressed themselves as independent TE copies, and 9 – as selective copies and markers. The last group contained all the “hot” segments of HHS-induced transpositions: 43B, 97DE, etc. Thus, the final TE patterns-consensuses of induced TE transpositions in generation F50 of (+)- and (-)-selection contained both the random and adaptive components. Probably, among the last there were TE-modifiers, produced the new genetic regulatory variability of polygenes of the selected quantitative trait in the isogenic strain after HHS.

This work was supported by the grants of RFBR (№№ 97-04-49232, 00-04-49499) and of the program “Russian Universities – Basic Researches” (№ 1760) of the Russian Federation Ministry of Education.

Note. Abstracts are published in author's edition

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