Genomic Distribution and Transcription of Solitary HERV-K LTRs
In: Genomics, Jg. 18 (1993-11-01), S. 261-269
Online
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Zugriff:
The human genome contains a family of endogenous retroviruses, HERV-K, with sequence homology to the B-type mouse mammary tumor virus. The authors have now identified a single HERV-K LTR within the C-type-related human retroviral element S71. The HERV-K LTR is located in the antisense direction between the S71 gag and the pol gene, replacing the 5[prime] half of S71 pol. A number of HERV-K LTR-related cDNA clones were detected by screening various human cDNA libraries with an S71 HERV-K LTR probe, indicating abundant transcription of HERV-K-related LTRs in human tissues. Sequence analysis of four cDNA clones revealed LTR sequences with a nucleotide identity of 70 to 90% with HERV-K10 LTR. Some HERV-K-related LTR sequences contain potential short open reading frames. The analyzed cDNA clones do not harbor any retroviral sequences other than those related to HERV-K LTRs. However, most of the solitary LTRs were found to be coexpressed with cellular sequences. Transcription of these LTRs is probably directed by external cellular promoters. The authors show that HERV-K LTR-like sequences entered the primate genome about 33-40 million years ago. They estimate the human genome to contain about 25,000 copies of HERV-K-related LTRs, which are distributed over most human chromosomes in anmore » irregular manner. 44 refs., 5 figs., 1 tab.« less
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Genomic Distribution and Transcription of Solitary HERV-K LTRs
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Autor/in / Beteiligte Person: | Francke, Uta ; Geigl, Eva-Maria ; Haltmeier, Manuela ; Brack-Werner, Ruth ; Werner, Thomas ; Leib-Mösch, Christine ; Hehlmann, R. ; Erfle, Volker |
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Zeitschrift: | Genomics, Jg. 18 (1993-11-01), S. 261-269 |
Veröffentlichung: | Elsevier BV, 1993 |
Medientyp: | unknown |
ISSN: | 0888-7543 (print) |
DOI: | 10.1006/geno.1993.1464 |
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