NDLI: Patterns of microsatellite evolution inferred from the Helianthus annuus (Asteraceae) transcriptome

Content Provider	Springer Nature Link
Author	PRAMOD, SREEPRIYA PERKINS, ANDY D. WELCH, MARK E.
Copyright Year	2014
Abstract	The distribution of microsatellites in exons, and their association with gene ontology (GO) terms is explored to elucidate patterns of microsatellite evolution in the common sunflower, Helianthus annuus. The relative position, motif, size and level of impurity were estimated for each microsatellite in the unigene database available from the Compositae Genome Project (CGP), and statistical analyses were performed to determine if differences in microsatellite distributions and enrichment within certain GO terms were significant. There are more translated than untranslated microsatellites, implying that many bring about structural changes in proteins. However, the greatest density is observed within the UTRs, particularly 5$^{′}$UTRs. Further, UTR microsatellites are purer and longer than coding region microsatellites. This suggests that UTR microsatellites are either younger and under more relaxed constraints, or that purifying selection limits impurities, and directional selection favours their expansion. GOs associated with response to various environmental stimuli including water deprivation and salt stress were significantly enriched with microsatellites. This may suggest that these GOs are more labile in plant genomes, or that selection has favoured the maintenance of microsatellites in these genes over others. This study shows that the distribution of transcribed microsatellites in H. annuus is nonrandom, the coding region microsatellites are under greater constraint compared to the UTR microsatellites, and that these sequences are enriched within genes that regulate plant responses to environmental stress and stimuli.
Starting Page	431
Ending Page	442
Page Count	12
File Format	PDF
ISSN	00221333
Journal	Journal of Genetics
Volume Number	93
Issue Number	2
e-ISSN	09737731
Language	English
Publisher	Springer India
Publisher Date	2014-08-30
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	microsatellite evolution transcriptome selection untranslated regions Helianthus annuus. Life Sciences Microbial Genetics and Genomics Plant Genetics & Genomics Animal Genetics and Genomics Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Genetics

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