Abstract：
:Eight new examples of retrotransposons of the Gypsy/Ty3 class have been identified in marine species. A 525-nt pol gene-coding region was amplified using degenerate primers from highly conserved regions and has extended the range of recognition of Gypsy/Ty3 far beyond those previously known. The following matrix shows the percentage AA divergence of the translations of this segment of the pol gene coding region. [table: see text] The underlines separate three groups of retrotransposons that can be recognized on the basis of this amino acid sequence. The new upper group shows surprising amino acid sequence similarity among members from the DNA of herring, sea urchin, starfish, and a tunicate. For example, the herring element differs by only 41% from the Ciona element and 46% from the sea urchin element. The group between the lines includes members close to previously known elements (marked by asterisks) and has so far been found only in sea urchins. The two upper groups differ from each other by 55-60% and yet members of both groups (e.g., Spr1 and Spr2) are integrated into the DNA of one species--S. purpuratus. Below the lower underline is listed the only known representative of a very distant group, which occurs in starfish DNA. In spite of large divergence, amino acid sequence comparisons indicate that all of the elements shown in the array are members of the LTR-containing class of retrotransposons that includes Gypsy of Drosophila and Ty3 of yeast. Of all known mobile elements this class shows the closest sequence similarity to retroviruses and has the same arrangement of genes as simpler retroviruses.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Britten RJ,McCormack TJ,Mears TL,Davidson EHdoi
10.1007/BF00166592subject
Has Abstractpub_date
1995-01-01 00:00:00pages
13-24issue
1eissn
0022-2844issn
1432-1432journal_volume
40pub_type
杂志文章abstract：:The trnT-trnF region is located in the large single-copy region of the chloroplast genome. It consists of the trnL intron, a group I intron, and the trnT-trnL and trnL-trnF intergenic spacers. We analyzed the evolution of the region in the three genera of the gymnosperm lineage Gnetales (Gnetum, Welwitschia, and Ephed...
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更新日期：2000-06-01 00:00:00
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更新日期：1995-03-01 00:00:00
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journal_title：Journal of molecular evolution
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更新日期：2002-02-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：2005-11-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 信件
doi：10.1007/s00239-015-9694-8
更新日期：2015-10-01 00:00:00
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更新日期：2010-12-01 00:00:00
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更新日期：1975-08-05 00:00:00
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更新日期：2014-12-01 00:00:00
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pub_type： 杂志文章
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更新日期：2003-10-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：2005-03-01 00:00:00
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更新日期：1992-10-01 00:00:00
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更新日期：1994-05-01 00:00:00
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更新日期：1984-01-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：1989-11-01 00:00:00
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journal_title：Journal of molecular evolution
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更新日期：1999-07-01 00:00:00
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更新日期：1987-01-01 00:00:00
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journal_title：Journal of molecular evolution
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更新日期：1996-07-01 00:00:00
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pub_type： 杂志文章
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更新日期：1986-01-01 00:00:00
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