Articles

ANALYSIS OF EXPRESSED SEQUENCE TAGS FROM JAPANESE PEAR ‘HOUSUI’

Article number
814_110
Pages
645 – 650
Language
English
Abstract
The development and ripening of fruits consists of complex physiological processes in relation to major changes in metabolism for pear fruits.
It is very important to understand gene expression and regulation for several developmental stages in pear fruits in order to improve fruit quality in pear breeding programs.
We are now conducting comprehensive functional genomic approaches such as a large-scale EST (expressed sequence tags) analysis, cataloging of expressing genes in fruits, and microarray analysis, in order to explore and utilize genes involved in fruit development and quality, to breed leading cultivars, to identify genes related to interesting phenotypic traits, and to evaluate the synteny within the Rosaceae family.
As a first step, we have established a collection of expressed sequence tags from various tissues of the Japanese pear (Pyrus pyrifolia Nakai) cultivar ‘Housui’, focusing on fruit tissues at several developmental stages.
More than 25,000 ESTs have been collected from 11 different cDNA libraries.
Clustering of the obtained sequences resulted in a set of 10,350 non-redundant sequences comprising 3,419 tentative contigs and 6,931 singletons.
Among them, 7,473 sequences showed significant homology with the genes from Arabidopsis. Many potential molecular markers are abundantly found in the transcripts.
Five hundred and seven dinucleotide repeats are found in the non-redundant ESTs, in which the CT/TC motifs are most abundantly found (62.5%). We also found 369 trinucleotide repeats, which do not show a similar degree of sequence bias in their representation.
Bi-allelic single-nucleotide polymorphisms among pear varieties (P. pyrifolia Nakai, P. communis L., P. bretschneideri Rehd, and P. ussuriensis Maxim) are found every 50 bp, on average.
Several ESTs showing homology to genes involved in cell wall formation, phytohormone response, and metabolism, transcriptional regulation and other functions were also obtained.
A database of the obtained ESTs is now under construction.

Publication
Authors
C. Nishitani, T. Shimizu, H. Fujii, S. Terakami, T. Yamamoto
Keywords
Pyrus pyrifolia, EST, fruit development
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