Comparative BAC end sequence analysis of tomato and potato reveals overrepresentation of specific gene families in potato.

BMC Plant Biology
Erwin DatemaRoeland C G J van Ham

Abstract

Tomato (Solanum lycopersicon) and potato (S. tuberosum) are two economically important crop species, the genomes of which are currently being sequenced. This study presents a first genome-wide analysis of these two species, based on two large collections of BAC end sequences representing approximately 19% of the tomato genome and 10% of the potato genome. The tomato genome has a higher repeat content than the potato genome, primarily due to a higher number of retrotransposon insertions in the tomato genome. On the other hand, simple sequence repeats are more abundant in potato than in tomato. The two genomes also differ in the frequency distribution of SSR motifs. Based on EST and protein alignments, potato appears to contain up to 6,400 more putative coding regions than tomato. Major gene families such as cytochrome P450 mono-oxygenases and serine-threonine protein kinases are significantly overrepresented in potato, compared to tomato. Moreover, the P450 superfamily appears to have expanded spectacularly in both species compared to Arabidopsis thaliana, suggesting an expanded network of secondary metabolic pathways in the Solanaceae. Both tomato and potato appear to have a low level of microsynteny with A. thaliana. A higher ...Continue Reading

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Software Mentioned

cross
BLASTN
blastall
InterProScan
RepeatMasker
TAIR
SOL
Sputnik
match
R

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