Bari-1，果蝇中一个新的类转座子家族，具有独特的异染色质组织。
Bari-1, a new transposon-like family in Drosophila melanogaster with a unique heterochromatic organization.
作者信息
Caizzi R, Caggese C, Pimpinelli S
机构信息
Istituto di Genetica, Università di Bari, Italy.
出版信息
Genetics. 1993 Feb;133(2):335-45. doi: 10.1093/genetics/133.2.335.
Abstract
We have identified a new middle repetitive DNA family in Drosophila melanogaster. This family is composed of a 1.7-kb element, called Bari-1, that shows common characteristics with many transposable elements. Bari-1 is present in a few euchromatic sites that vary in different stocks. However, it is peculiar in that most copies are homogeneously clustered with a unique location in a specific heterochromatic region close to the centromere of the second chromosome. The molecular analysis of different copies coming from the euchromatin and the heterochromatin has revealed that, independent of their location, all possess the same open reading frame. The putative protein encoded by Bari-1 shares similarity with the transposase of the Tc1 transposon of Caenorhabditis elegans. We compare the Bari-1 organization with other mobile DNA families and discuss the possibility of some functional role for the heterochromatic cluster.
摘要
我们在黑腹果蝇中鉴定出一个新的中度重复DNA家族。这个家族由一个1.7千碱基的元件组成，称为Bari-1，它与许多转座元件具有共同特征。Bari-1存在于少数常染色质位点，这些位点在不同品系中有所不同。然而，其独特之处在于，大多数拷贝在靠近第二条染色体着丝粒的特定异染色质区域中以唯一位置均匀聚集。对来自常染色质和异染色质的不同拷贝进行分子分析表明，无论其位置如何，所有拷贝都具有相同的开放阅读框。Bari-1编码的推定蛋白质与秀丽隐杆线虫Tc1转座子的转座酶具有相似性。我们将Bari-1的结构与其他可移动DNA家族进行比较，并讨论异染色质簇可能具有的一些功能作用。
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