Home LiteratureArticle Details
PMID: 16607031 Published · ppublish English Comparative Study Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

A comparative genomics strategy for targeted discovery of single-nucleotide polymorphisms and conserved-noncoding sequences in orphan crops.

Plant physiology ·Vol. 140 ·No. 4 ·2006-04-00 ·Pages 1183-91

Feltus FA, Singh HP, Lohithaswa HC, Schulze SR, Silva TD, Paterson AH

Abstract

Completed genome sequences provide templates for the design of genome analysis tools in orphan species lacking sequence information. To demonstrate this principle, we designed 384 PCR primer pairs to conserved exonic regions flanking introns, using Sorghum/Pennisetum expressed sequence tag alignments to the Oryza genome. Conserved-intron scanning primers (CISPs) amplified single-copy loci at 37% to 80% success rates in taxa that sample much of the approximately 50-million years of Poaceae divergence. While the conserved nature of exons fostered cross-taxon amplification, the lesser evolutionary constraints on introns enhanced single-nucleotide polymorphism detection. For example, in eight rice (Oryza sativa) genotypes, polymorphism averaged 12.1 per kb in introns but only 3.6 per kb in exons. Curiously, among 124 CISPs evaluated across Oryza, Sorghum, Pennisetum, Cynodon, Eragrostis, Zea, Triticum, and Hordeum, 23 (18.5%) seemed to be subject to rigid intron size constraints that were independent of per-nucleotide DNA sequence variation. Furthermore, we identified 487 conserved-noncoding sequence motifs in 129 CISP loci. A large CISP set (6,062 primer pairs, amplifying introns from 1,676 genes) designed using an automated pipeline showed generally higher abundance in recombinogenic than in nonrecombinogenic regions of the rice genome, thus providing relatively even distribution along genetic maps. CISPs are an effective means to explore poorly characterized genomes for both DNA polymorphism and noncoding sequence conservation on a genome-wide or candidate gene basis, and also provide anchor points for comparative genomics across a diverse range of species.

MeSH Terms
Base Sequence Chromosomes, Plant/genetics Conserved Sequence Crops, Agricultural/genetics Expressed Sequence Tags Genomics/methods Genotype Introns Molecular Sequence Data Poaceae/genetics Polymorphism, Single Nucleotide Sequence Alignment Untranslated Regions
Chemicals
Untranslated Regions
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Feltus F A
Plant Genome Mapping Laboratory, University of Georgia, Athens, Georgia 30602, USA.
Singh H P
Lohithaswa H C
Schulze S R
Silva T D
Paterson A H
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
Published
2006-04-00
Pages
1183-91
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC1435799
Subset
IM
Databases
GENBANK
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