2 SUBFAMILIES OF MURINE RETROTRANSPOSON ETN SEQUENCES

被引:29
作者
SHELL, BE [1 ]
COLLINS, JT [1 ]
ELENICH, LA [1 ]
SZUREK, PF [1 ]
DUNNICK, WA [1 ]
机构
[1] UNIV MICHIGAN,SCH MED,DEPT MICROBIOL & IMMUNOL,1301 E CATHERINE,ANN ARBOR,MI 48109
关键词
immunoglobulin switch regions; nucleotide sequences; Recombinant DNA; repetitive DNA;
D O I
10.1016/0378-1119(90)90289-4
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Early transposon (ETn) elements are 5.7-kb retrotransposons found in the murine genome. We have sequenced large portions of two ETn elements that have apparently transposed within the DNA of a murine myeloma cell line, P3.26Bu4. One of the transposed ETn elements has 5′ and 3′ long terminal repeats (LTRs) that are exact duplicates of each other and has a 6-bp target site duplication. These results suggest that this element, which inserted into an immunoglobulin γ1 switch region, moved by a retrotransposition process. Our nucleotide sequences confirm that individual ETn elements are very similar to one another and lack open reading frames. However, the ETn sequences reported here and those previously described differ significantly near their 5′ LTRs, including 200 bp of weak similarity and 240 bp of complete disparity. Southern hybridization analysis suggests that both subfamilies of ETn sequences are represented many times in the mouse genome. The possibility that the disparate sequences have a role in transposition by ETn elements is discussed. © 1990.
引用
收藏
页码:269 / 274
页数:6
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