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• W4256165626 abstract "Two distinct site-specific retrotransposon families, named RT1 and RT2, from the sibling mosquito species Anopheles gambiae and A. arabiensis, respectively, were previously identified. Both were shown to occupy identical nucleotide positions in the 28S rRNA gene and to be flanked by identical 17-bp target site duplications. Full-length representatives of each have been isolated from a single species, A. gambiae, and the nucleotide sequences have been analyzed. Beyond insertion specificity, RT1 and RT2 share several structural and sequence features which show them to be members of the LINE-like, or non-long-terminal-repeat retrotransposon, class of reverse transcriptase-encoding mobile elements. These features include two long overlapping open reading frames (ORFs), poly(A) tails, the absence of long terminal repeats, and heterogeneous 5' truncation of most copies. The first ORF of both elements, particularly ORF1 of RT1, is glutamine rich and contains long tracts of polyglutamine reminiscent of the opa repeat. Near the carboxy ends, three cysteine-histidine motifs occur in ORF1 and one occurs in ORF2. In addition, each ORF2 contains a region of sequence similarity to reverse transcriptases and integrases. Alignments of the protein sequences from RT1 and RT2 reveal 36% identity over the length of ORF1 and 60% identity over the length of ORF2, but the elements cannot be aligned in the 5' and 3' noncoding regions. Unlike that of RT2, the 5' noncoding region of RT1 contains 3.5 copies of a 500-bp subrepeat, followed by a poly(T) tract and two imperfect 55-bp subrepeats, the second spanning the beginning of ORF1. The pattern of distribution of these elements among five siblings species in the A. gambiae complex is nonuniform. RT1 is present in laboratory and wild A. gambiae, A. arabiensis, and A. melas but has not been detected in A. quadriannulatus or A. merus. RT2 has been detected in all available members of the A. gambiae complex except A. merus. Copy number fluctuates, even among the offspring of individual wild female A. gambiae mosquitoes. These findings reflect a complex evolutionary history balancing gain and loss of copies against the coexistence of two elements competing for a conserved target site in the same species for perhaps millions of years." @default.
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• W4256165626 date "1992-11-01" @default.
• W4256165626 modified "2023-09-28" @default.
• W4256165626 title "Distinct families of site-specific retrotransposons occupy identical positions in the rRNA genes of Anopheles gambiae" @default.
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• W4256165626 doi "https://doi.org/10.1128/mcb.12.11.5102-5110.1992" @default.
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