PMID: 8610105Apr 2, 1996Paper

The genomic and physical organization of Ty1-copia-like sequences as a component of large genomes in Pinus elliottii var. elliottii and other gymnosperms

Proceedings of the National Academy of Sciences of the United States of America
A KammT Schmidt

Abstract

A DNA sequence, TPE1, representing the internal domain of a Ty1-copia retroelement, was isolated from genomic DNA of Pinus elliottii Engelm. var. elliottii (slash pine). Genomic Southern analysis showed that this sequence, carrying partial reverse transcriptase and integrase gene sequences, is highly amplified within the genome of slash pine and part of a dispersed element >4.8 kbp. Fluorescent in situ hybridization to metaphase chromosomes shows that the element is relatively uniformly dispersed over all 12 chromosome pairs and is highly abundant in the genome. It is largely excluded from centromeric regions and intercalary chromosomal sites representing the 18S-5.8S-25S rRNA genes. Southern hybridization with specific DNA probes for the reverse transcriptase gene shows that TPE1 represents a large subgroup of heterogeneous Ty1-copia retrotransposons in Pinus species. Because no TPE1 transcription could be detected, it is most likely an inactive element--at least in needle tissue. Further evidence for inactivity was found in recombinant reverse transcriptase and integrase sequences. The distribution of TPE1 within different gymnosperms that contain Ty1-copia group retrotransposons, as shown by a PCR assay, was investigated by ...Continue Reading

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