Molecular Biology and Evolution 17:825-829 (2000)
© 2000 Society for Molecular Biology and Evolution
Letter to the Editor |
Patterns of Diversity Among SINE Elements Isolated from Three Y-Chromosome Genes in Carnivores
Laboratory of Genomic Diversity, Frederick Cancer and Research Development Center, National Cancer Institute, Frederick, Maryland
Short interspersed elements (SINEs) are forms of "selfish" DNA scattered throughout eukaryotic genomes (Jelinek and Schmid 1982
; Daniels and Deininger 1985
). SINEs exist in high copy numbers and, combined with long interspersed nuclear element (LINEs) and retroelements resembling retroviruses, may constitute 36% of the total genome (Smit et al. 1996
). A consensus of research of the human Alu SINE family and novel SINEs from other vertebrate and invertebrate taxa (see Okada 1991
a, 1991b; Ohshima and Okada 1994
; Shimamura et al. 1997
) defines evolutionary lineages, or subfamilies, which originated from small RNA molecules such as 7SL RNA (Alu) or tRNAs. Proposed mechanisms governing the proliferation of SINE subfamilies generally invoke transcription in high copy number of a source, or master copy, SINE, followed by reverse transcription into DNA and reinsertion at a new site (Deininger et al. 1992
; Brookfield 1994
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