Spontaneous unstable unc-22 IV mutations in C. elegans var. Bergerac.

Spontaneous unstable unc-22 IV mutations in C. elegans var. Bergerac.
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线虫变种中自发不稳定的 unc-22 IV 突变。

DOI:
10.1093/genetics/108.4.859
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发表时间:
1984
期刊:
影响因子:
3.3
通讯作者:
Waterston,RH
Waterston,RH
中科院分区:
生物学2区
文献类型:
--
作者:
Moerman,DG;Waterston,RH

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本文描述了一种线虫线虫突变系统。Genunc-22的Bergerac。九点C。ELEANS和TWOC。Briggsaestrains只测试Bergerac BO菌株产生高频突变动物,而unc-22 IV基因是首选的突变目标。Bergerac BO的unc-22位点正向自发突变频率约为1×10-4,大多数自发突变在2×10-3~2×10-4之间回复。正向突变频率和回复频率对遗传背景都很敏感。Spontaneousunc-22突变产生于Bergerac背景,并主要置于布里斯托尔背景中,以10-6的频率回复。当重新引入Bergerac/Bristol杂交背景时,突变再次变得不稳定。突变活性不能定位于Bergerac基因组中的离散位置。突变子的活性也不需要Bergeracunc-22基因作为靶标,因为置于Bergerac背景中的Bristolunc-22同源基因也显示出高突变频率。两个自发的unc-22等位基因st136和st137的基因内图谱显示,这两个突变都位于已知unc-22图谱的中心区域。然而,这些突变可能会相互重组,这表明这些不稳定的突变可能发生在unc-22中的多个位置。对这些突变对肌肉结构的表型影响的检测表明,它们的影响没有已知的琥珀等位基因那么严重。我们认为这个突变系统是多基因的,分布在线虫基因组上,可以代表转座元件Tc1的活性。
This paper describes a mutator system in the nematodeCaenorhabditis elegansvar. Bergerac for the geneunc-22. Of nineC. elegansand twoC. briggsaestrains tested only the Bergerac BO strain yielded mutant animals at a high frequency and theunc-22 IVgene is a preferred mutational target. The forward spontaneous mutation frequency at theunc-22locus in Bergerac BO is about 1 × 10-4, and most of these spontaneousunc-22mutations revert at frequencies between 2 × 10-3and 2 × 10-4. Both the forward mutation frequency and the reversion frequency are sensitive to genetic background. Spontaneousunc-22mutations derived in a Bergerac background and placed in a primarily Bristol background revert at frequencies of <10-6. When reintroduced into a Bergerac/Bristol hybrid background the mutations once again become unstable.The mutator activity could not be localized to a discrete site in the Bergerac genome. Nor did mutator activity require the Bergeracunc-22gene as a target since the Bristolunc-22homolog placed in a Bergerac background also showed high mutation frequency. Intragenic mapping of two spontaneousunc-22alleles,st136andst137, place both mutations in the central region of the knownunc-22map. However, these mutations probably recombine with one another, suggesting that the unstable mutations can occur in more than one site inunc-22. Examination of the phenotypic effect of these mutations on muscle structure indicates that they are less severe in their effect than a known amber allele. We suggest that this mutator system is polygenic and dispersed over the nematode genome and could represent activity of the transposable elementTc1.
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