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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Establecimiento de un índice de genes en Ipomoea batatas (L.) Lam. usando secuenciamiento 454 a partir de bibliotecas de cDNA y desarrollo de marcadores microsatélites

Tincopa Marca, Luz Rosalina January 2010 (has links)
Un índice de genes de camote Ipomoea batatas (L.) Lam. ha sido establecido basado en el pirosecuenciamiento. Dos colecciones normalizadas de cDNA de tallos y hojas de camote cultivar Tanzania que habían sido expuestos a sequía, dieron 524,209 reads. Después del establecimiento de los parámetros óptimos de ensamblaje, estos reads fueron ensamblados junto con 22,094 EST disponibles públicamente en el GenBank, dando como resultado del ensamblaje 31,685 contigs y 34,733 singletons. Las comparaciones usando Blastx en la base de datos del UniRef100 permitió la anotación de 23,957 contigs y 15,342 singletons, resultando en 24,657 genes únicos. Además, 27,119 secuencias no tienen ninguna coincidencia con las secuencias proteicas del Uniref100. La anotación de 24,763 secuencias incluye la atribución de GO terms. Adicionalmente, se han encontrado 293 genes involucrados en la respuesta a estrés hídrico. Basado en este índice de genes, se ha identificado 195 marcadores microsatélites que fueron amplificados exitosamente y evaluados en un grupo de seis hexaploides de Ipomoea batatas y dos diploides de Ipomoea trífida. Palabras claves: anotación de genes, ensamblaje de transcriptoma, Ipomoea batatas, Ipomoea trífida, marcadores microsatélites, pirosecuenciamiento 454, recursos genéticos. / --- A sweetpotato Ipomoea batatas (L.) Lam. gene index was established based on pyrosequencing. Two normalized cDNA collections from stems and leaves were produced from drought stressed sweetpotato cultivar Tanzania and yielded 524,209 pyrosequencing reads. After establishment of the optimal assembly parameters, these reads were assembled together with 22,094 publically available expressed sequence tags into 31,685 sets of overlapping DNA segments and 34,733 unassembled sequences. Blastx comparisons with the UniRef100 database allowed annotation of 23,957 contigs and 15,342 singletons resulting in 24,657 putatively unique genes. Further 27,119 sequences had no match to protein sequences of UniRef100 database. Annotation of 24,763 sequences included the attribution of gene ontology terms to as many sequences as possible. In adition it was found 293 genes involved in water response. Based on this gene index, we have identified 195 gene-based microsatellite markers that could be successfully amplified and scored in a test panel of six hexaploid I. batatas and 2 diploid I. trifida genotypes. Key words: Ipomoea batatas, Ipomoea trífida, gene annotation, genetic resources, microsatellite markers, 454 pyrosequencing, transcriptome assembly.

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