First published online February 24, 2002; 10.1104/pp.010681
Plant Physiol, March 2002, Vol. 128, pp. 896-910
Comparison of RNA Expression Profiles Based on Maize
Expressed Sequence Tag Frequency Analysis and Micro-Array
Hybridization1
John
Fernandes,
Volker
Brendel,
Xiaowu
Gai,
Shailesh
Lal,
Vicki L.
Chandler,
Rangasamy P.
Elumalai,
David W.
Galbraith,
Elizabeth A.
Pierson, and
Virginia
Walbot*
Department of Biological Sciences, Stanford University, Stanford,
California 94305-5020 (J.F., V.W.); Departments of Zoology and
Genetics (V.B., X.G., S.L.) and Statistics (V.B.), Iowa State
University, Ames, Iowa 50011-3260; and Department of Plant Sciences,
University of Arizona, Tucson, Arizona 85721-0001 (V.L.C., R.P.E.,
D.W.G., E.A.P.)
Assembly of 73,000 expressed sequence tags (ESTs)
representing multiple organs and developmental stages of maize
(Zea mays) identified approximately 22,000 tentative
unique genes (TUGs) at the criterion of 95% identity. Based on
sequence similarity, overlap between any two of nine libraries with
more than 3,000 ESTs ranged from 4% to 20% of the constituent TUGs.
The most abundant ESTs were recovered from only one or a minority of
the libraries, and only 26 EST contigs had members from all nine EST
sets (presumably representing ubiquitously expressed genes). For
several examples, ESTs for different members of gene families were
detected in distinct organs. To study this further, two types of
micro-array slides were fabricated, one containing 5,534 ESTs from 10- to 14-d-old endosperm, and the other 4,844 ESTs from immature ear,
estimated to represent about 2,800 and 2,500 unique genes,
respectively. Each array type was hybridized with fluorescent cDNA
targets prepared from endosperm and immature ear poly(A+)
RNA. Although the 10- to 14-d-old postpollination endosperm TUGs showed
only 12% overlap with immature ear TUGs, endosperm target hybridized
with 94% of the ear TUGs, and ear target hybridized with 57% of the
endosperm TUGs. Incomplete EST sampling of low-abundance transcripts
contributes to an underestimate of shared gene expression profiles.
Reassembly of ESTs at the criterion of 90% identity suggests how cross
hybridization among gene family members can overestimate the overlap in
genes expressed in micro-array hybridization experiments.
1
This work was supported by the National Science
Foundation Plant Genome Research Program as part of the Maize Gene
Discovery, DNA Sequencing, and Phenotypic Analysis project (grant no.
DBI-9872657).
*
Corresponding author; e-mail walbot{at}stanford.edu; fax
650-725-8221.
© 2002 American Society of Plant Physiologists
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