BmSE, a SINE family with 3′ ends of (ATTT) repeats in domesticated silkworm (Bombyx mori)

作     者：Jinshan Xu Tie Liu Dong Li Ze Zhang Qinyou Xia Zeyang Zhou 

作者机构：Laboratory of Animal Biology Chongqing Normal University Chongqing 400047 China Engineering Research Center of Bioactive Substances Chongqing Normal University Chongqing 400047 China Institute of Sericulture and System Biology Southwest University Chongqing 400716 China 

出 版 物：《Journal of Genetics and Genomics》 (遗传学报（英文版）)

年 卷 期：2010年第37卷第2期

页      面：125-135页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0905[农学-畜牧学] 09[农学] 071007[理学-遗传学] 090501[农学-动物遗传育种与繁殖] 

基　　金：supported by the Natural Science Foun-dation Project of CQ CSTC (No. 2009BB1241) Ministry of Science and Technology of China (No. 2006AA10A117 and 2005CB121003) 

主　　题：domesticated silkworm SINE distribution structural variant 

摘      要：Short interspersed elements （SINEs）, which are mainly composed of Bm1, are abundant in the domesticated silkworm. A 294 bp novel SINE family, designated as BmSE, was identified by mining the database of the complete Bombyx mori genome. A representational BmSE element is flanked by an 11 bp target site duplication sequence posterior poly （A） at the 3′ end and has the sequence motifs of an internal promoter of RNA polymerase III, which are similar to that of Bm1. The repetitive elements of BmSE are widely distributed in all 28 chromosomes of the genome and share the common （ATTT） repeats at the ends. GC-content distribution shows that BmSE tends to accumulate preferably in the region of higher AT content than that of Bm1. A high proportion of the BmSEs are mapped to the coding sequence introns, whereas several elements are also present in the UTR of some transcripts, indicating that BmSEs are indeed exonized with UTRs. Of the 615 identified structural variants （SVs） of BmSE among the 40 domesticated and wild silkworms, only 230 SVs were found in the domesticated silkworms, indicating that many recent SV events of BmSE occurred after domestication, which was probably due to its mobilization. Our analysis might assist in developing BmSE as a potential marker and in understanding the evolutionary roles of SINEs in the domesticated silkworm.