FREQUENT TRANSPOSITIONS OF DROSOPHILA-MELANOGASTER HET-A TRANSPOSABLE ELEMENTS TO RECEDING CHROMOSOME ENDS

被引：122

作者：

BIESSMANN, H ^{[1
]}

CHAMPION, LE ^{[1
]}

OHAIR, M ^{[1
]}

IKENAGA, K ^{[1
]}

KASRAVI, B ^{[1
]}

MASON, JM ^{[1
]}

机构：

[1] NIEHS,CELLULAR & GENET TOXICOL BRANCH,RES TRIANGLE PK,NC 27709

来源：

EMBO JOURNAL | 1992年 / 11卷 / 12期

关键词：

CHROMOSOME HEALING; DROSOPHILA; RECEDING CHROMOSOME ENDS; TELOMERE; TRANSPOSON;

D O I：

10.1002/j.1460-2075.1992.tb05547.x

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

HeT-A elements are a new family of transposable elements in Drosophila that are found exclusively in telomeric regions and in the pericentric heterochromatin. Transposition of these elements onto broken chromosome ends has been implicated in chromosome healing. To monitor the fate of HeT-A elements that had attached to broken ends of the X chromosome, we examined individual X chromosomes from a defined population over a period of 17 generations. The ends of the X chromosomes with new HeT-A additions receded at the same rate as the broken ends before the HeT-A elements attached. In addition, some chromosomes, approximately 1% per generation, had acquired new HeT-A sequences of an average of 6 kb at their ends with oligo(A) tails at the junctions. Thus, the rate of addition of new material per generation matches the observed rate of terminal loss (70-75 bp) caused by incomplete replication at the end of the DNA molecule. One such recently transposed HeT-A element which is at least 12 kb in length has been examined in detail. It contains a single open reading frame of 2.8 kb which codes for a gag-like protein.

引用

页码：4459 / 4469

页数：11

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