Document Detail

LINE-1 preTa elements in the human genome.
MedLine Citation:
PMID:  12589758     Owner:  NLM     Status:  MEDLINE    
The preTa subfamily of long interspersed elements (LINEs) is characterized by a three base-pair "ACG" sequence in the 3' untranslated region, contains approximately 400 members in the human genome, and has low level of nucleotide divergence with an estimated average age of 2.34 million years old suggesting that expansion of the L1 preTa subfamily occurred just after the divergence of humans and African apes. We have identified 362 preTa L1 elements from the draft human genomic sequence, investigated the genomic characteristics of preTa L1 insertions, and screened individual elements across diverse human populations and various non-human primate species using polymerase chain reaction (PCR) assays to determine the phylogenetic origin and levels of human genomic diversity associated with the L1 elements. All of the preTa L1 elements analyzed by PCR were absent from the orthologous positions in non-human primate genomes with 33 (14%) of the L1 elements being polymorphic with respect to insertion presence or absence in the human genome. The newly identified L1 insertion polymorphisms will prove useful as identical by descent genetic markers for the study of human population genetics. We provide evidence that preTa L1 elements show an integration site preference for genomic regions with low GC content. Computational analysis of the preTa L1 elements revealed that 29% of the elements amenable to complete sequence analysis have apparently escaped 5' truncation and are essentially full-length (approximately 6kb). In all, 29 have two intact open reading frames and may be capable of retrotransposition.
Abdel Halim Salem; Jeremy S Myers; Anthony C Otieno; W Scott Watkins; Lynn B Jorde; Mark A Batzer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of molecular biology     Volume:  326     ISSN:  0022-2836     ISO Abbreviation:  J. Mol. Biol.     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-02-18     Completed Date:  2003-04-11     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2985088R     Medline TA:  J Mol Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1127-46     Citation Subset:  IM    
Department of Biological Sciences, Biological Computation and Visualization Center, Louisiana State University, 202 Life Sciences Building, Baton Rouge, LA 70803, USA.
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MeSH Terms
Base Sequence
Cell Line
Evolution, Molecular*
Genome, Human*
Long Interspersed Nucleotide Elements / genetics*
Polymerase Chain Reaction
Polymorphism, Genetic
Primates / genetics
Sequence Alignment
Sequence Analysis, DNA*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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