NDLI: Comparing sequenced segments of the tomato and Arabidopsis genomes: Large-scale duplication followed by selective gene loss creates a network of synteny

Content Provider	PubMed Central
Author	Ku, Hsin-mei Todd, Vision Liu, Jiping Tanksley, Steven D.
Copyright Year	2000
Abstract	A 105-kilobase bacterial artificial chromosome (BAC) clone from the ovate-containing region of tomato chromosome 2 was sequenced and annotated. The tomato BAC sequence was then compared, gene by gene, with the sequenced portions of the Arabidopsis thaliana genome. Rather than matching a single portion of the Arabidopsis genome, the tomato clone shows conservation of gene content and order with four different segments of Arabidopsis chromosomes 2–5. The gene order and content of these individual Arabidopsis segments indicate that they derived from a common ancestral segment through two or more rounds of large-scale genome duplication events—possibly polyploidy. One of these duplication events is ancient and may predate the divergence of the Arabidopsis and tomato lineages. The other is more recent and is estimated to have occurred after the divergence of tomato and Arabidopsis ≈112 million years ago. Together, these data suggest that, on the scale of BAC-sized segments of DNA, chromosomal rearrangements (e.g., inversions and translocations) have been only a minor factor in the divergence of genome organization among plants. Rather, the dominating factors have been repeated rounds of large-scale genome duplication followed by selective gene loss. We hypothesize that these processes have led to the network of synteny revealed between tomato and Arabidopsis and predict that such networks of synteny will be common when making comparisons among higher plant taxa (e.g., families).
Starting Page	9121
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	16
Volume Number	97
Language	English
Publisher	The National Academy of Sciences
Publisher Date	2000-08-01
Access Restriction	Open
Rights Holder	The National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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