HeT-A and TART, two Drosophila retrotransposons with a bona fide role in chromosome structure for more than 60 million years

被引：35

作者：

Casacuberta, E ^{[1
]}

Pardue, ML ^{[1
]}

机构：

[1] MIT, Dept Biol, Cambridge, MA 02139 USA

来源：

CYTOGENETIC AND GENOME RESEARCH | 2005年 / 110卷 / 1-4期

关键词：

D O I：

10.1159/000084947

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

Drosophila telomeres have been maintained by retrotransposition for at least 60 MY, which predates the separation of extant species of this genus. Studies of D. melanogaster, D. yakuba, and D. virilis show that, in Drosophila, telomeres are composed of two non-LTR retrotransposons, HeT-A and TART. Far from being static, HeT-A and TART evolve faster than Drosophila euchromatic genes. In spite of their high rate of sequence change, HeT-A and TART maintain their basic structures and unusual individual features. The maintenance of their separate identities suggests that HeT-A and TART cooperate either in the process of retrotransposition onto the chromosome end, or in the formation of telomere chromatin by transposed DNA copies. The telomeric retrotransposons and the Drosophila genome constitute an example of a robust symbiotic relationship between mobile elements and the genome. Copyright (c) 2005 S . Karger AG, Basel.

引用

页码：152 / 159

页数：8

共 33 条

[31] INTERNALLY LOCATED AND OPPOSITELY ORIENTED POLYMERASE-II PROMOTERS DIRECT CONVERGENT TRANSCRIPTION OF A LINE-LIKE RETROELEMENT, THE DICTYOSTELIUM REPETITIVE ELEMENT, FROM DICTYOSTELIUM-DISCOIDEUM [J].