Philos Trans R Soc Lond B Biol Sci. 2003 Jan 29;358(1429):39-57; discussion 57-8.

How big is the iceberg of which organellar genes in nuclear genomes are but the tip?

Doolittle WF, Boucher Y, Nesbø CL, Douady CJ, Andersson JO, Roger AJ.

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Genome Atlantic, Dalhousie University, 5850 College Street, Halifax, Nova Scotia B3H 1X5, Canada. ford@is.dal.ca

Abstract

As more and more complete bacterial and archaeal genome sequences become available, the role of lateral gene transfer (LGT) in shaping them becomes more and more clear. Over the long term, it may be the dominant force, affecting most genes in most prokaryotes. We review the history of LGT, suggesting reasons why its prevalence and impact were so long dismissed. We discuss various methods purporting to measure the extent of LGT, and evidence for and against the notion that there is a core of never-exchanged genes shared by all genomes, from which we can deduce the "true" organismal tree. We also consider evidence for, and implications of, LGT between prokaryotes and phagocytic eukaryotes.

PMID:: 12594917; [PubMed - indexed for MEDLINE]
PMCID: PMC1693099

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