GENETIC AND MOLECULAR ANALYSES OF VGAL - A SPONTANEOUS AND UNSTABLE MUTATION AT THE VESTIGIAL LOCUS IN DROSOPHILA-MELANOGASTER

被引:5
作者
BAZIN, C
LEMEUNIER, F
PERIQUET, G
SILBER, J
机构
[1] LAB BIOL & GENET EVOLUT,CNRS,UPR 2411,GIF SUR YVETTE,FRANCE
[2] UNIV TOURS,INST BIOCENOT EXPTL AGROSYST,CNRS,URA 1298,F-372000 TOURS,FRANCE
关键词
D O I
10.1017/S0016672300029384
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
We describe herein, a new unstable mutant of the vestigial locus, isolated from a French natural population. From this mutant vestigial(almost) (vg(al)) wild-type flies (vg(al+)) and extreme vg phenotypes (vg(e)) arose spontaneously without genomic shock. The occurrence of vg(al+) or vg(e) alleles depends mostly on the breeding temperature; vg(al+) revertants arose principally at low temperature (21-degrees-C) and vg(e) at 28-degrees-C. These events occur mainly in the male germ line and the phenomenon appears to be premeiotic. Our results with in situ hybridization experiments and Southern blots show that the vg(al) mutation is due to a 2 kb DNA insertion, which is a deleted hobo element. Genetic and molecular analyses show that two distinct events may underly the wild-type revertants. One is the excision of the resident hobo element, the other a further deletion (about 300 bp in the example characterized herein). The vg(e) mutation is probably due to a deletion of vestigial sequences flanking the hobo insertion.
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页码:235 / 243
页数:9
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