Common modular structure of lentivirus LTRs.

Abstract:

:Retroviruses are expressed under the control of viral control regions designated long terminal repeats (LTRs), which contain all signals for transcriptional initiation as well as transcriptional termination. However, retroviral LTRs from different species within a common genus, such as Lentivirus, do not show significant overall sequence homology. We compiled a model of the functional organization of 20 Lentivirus LTRs which we show to recognize all known Lentivirus LTRs. To this end we combined our previously published methods for identification of transcription elements with secondary structure element analysis in a novel modular approach. We deduced descriptions for three new Lentivirus-specific sequence elements present in most of the Lentivirus LTRs but absent in LTRs of other retrovirus families (B, C, D-type, BLV-HTLV, Spuma). Four of the 10 elements defined in our study were primate-specific. We were able to deduce a phylogeny based on our model which agrees in general with the phylogeny derived from the polymerase genes of these viruses. Our model indicated that more than 100 LTRs from the databases are of Lentivirus origin and can be clearly separated from all other LTR types (B, C, D, BLV-HTLV, Spuma). This selectivity appears to be a unique feature of our modular approach.

journal_name

Virology

journal_title

Virology

authors

Frech K,Brack-Werner R,Werner T

doi

10.1006/viro.1996.0527

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

256-67

issue

1

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(96)90527-9

journal_volume

224

pub_type

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