Recombination between small X chromosome duplications and the X chromosome in Caenorhabditis elegans.

Recombination between small X chromosome duplications and the X chromosome in Caenorhabditis elegans.
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小 X 染色体重复与秀丽隐杆线虫 X 染色体之间的重组。

DOI:
10.1093/genetics/121.4.723
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发表时间:
1989
期刊:
影响因子:
3.3
通讯作者:
Kari,CK
Kari,CK
中科院分区:
生物学2区
文献类型:
--
作者:
Herman,RK;Kari,CK

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鉴定并表征了 12 个新的 X 染色体重复。八个易位到四个不同端粒附近的常染色体位点,四个是游离的。十个包括 unc-1(+),在野生型中靠近 X 染色体的左端,其中两个 mnDp72(X;IV) 和 mnDp73(X;f) 向右延伸经过 dpy-3。 mnDp72 和 mnDp73 在 unc-1-dpy-3 区间内与雄性中的一条 X 染色体重组,其频率比在相同区间内雌雄同体中观察到的 X-X 重组频率高 15 至 30 倍。重组重复和重组X染色体均被恢复。另外五个 unc-1(+) 重复也检测到与 unc-1-dpy-3 间隔中的 X 染色体重组,即使它们的正确断点位于该间隔内。在雌雄同体中,mnDp72 和 mnDp73 促进减数分裂 X 不分离,并与 unc-1-dpy-3 间隔中的 X 染色体重组,其频率与 X-X 重组相当。 mnDp72(X;IV) 还促进 IV 号染色体三体性。鉴定出的 Him-8 IV 突变严重减少了雌雄同体两条 X 染色体之间以及雄性 mnDp73 和 X 染色体之间的重组。 X 染色体与 X 右端或靠近但不包括左端的区域的重复之间的重组很少见。我们认为 X 染色体在其左端附近具有一个或多个促进减数分裂染色体配对的元件。
Twelve new X chromosome duplications were identified and characterized. Eight are translocated to autosomal sites near four different telomeres, and four are free. Ten include unc-1(+), which in wild type is near the left end of the X chromosome, and two of these, mnDp72(X;IV) and mnDp73(X;f), extend rightward past dpy-3. Both mnDp72 and mnDp73 recombined with the one X chromosome in males in the unc-1-dpy-3 interval at a frequency 15- to 30-fold higher than was observed for X-X recombination in hermaphrodites in the same interval. Recombinant duplications and recombinant X chromosomes were both recovered. Recombination with the X chromosome in the unc-1-dpy-3 interval was also detected for five other unc-1(+) duplications, even though their right breakpoints lie within the interval. In hermaphrodites, mnDp72 and mnDp73 promoted meiotic X nondisjunction and recombined with an X chromosome in the unc-1-dpy-3 interval at frequencies comparable to that found for X-X recombination; mnDp72(X;IV) also promoted trisomy for chromosome IV. A mutation in him-8 IV was identified that severely reduced recombination between the two X chromosomes in hermaphrodites and between mnDp73 and the X chromosome in males. Recombination between the X chromosome and duplications of either the right end of the X or a region near but not including the left end was rare. We suggest that the X chromosome has one or more elements near its left end that promote meiotic chromosome pairing.
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