ISSN:
1432-1432
Keywords:
Key words: Retrotransposon — LINE — Non-LTR retrotransposon —Bombyx mori, Insect — Histone genes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract. Repetitive sequences with oligo A tails were observed in Dra1 fragments of Bombyx mori genomic DNA. The full sequence of the element, an abundant non-LTR retrotransposon of B. mori, was determined by assembling inner restriction fragments. This element, designated L1Bm, contained two ORFs encoding a gag-like protein and reverse transcriptase (RT), respectively. An endonuclease domain was identified at the N-terminus of the RT sequence. The homology search of the amino acid sequences revealed that L1Bm belongs evolutionally to the same family as various other non-LTR retrotransposons of Drosophila and Mosquito. On the other hand, L1Bm resembles the L1 element of human genome in its high copy number and its frequent truncation at the 5′-side. Some units of the histone gene repeat in B. mori possess complete L1Bm elements in a 3′-flanking region of H2b.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00006228
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