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Series GSE8188 Query DataSets for GSE8188
Status Public on Dec 01, 2007
Title Expression profiling of zmet2-m1 mutants relative to wild-type
Organism Zea mays
Experiment type Expression profiling by array
Summary The contribution of epigenetic alterations to natural variation for gene transcription levels remains unclear. In this study, we investigated the functional targets of the maize chromomethylase ZMET2 in multiple inbred lines to determine whether epigenetic changes conditioned by this chromomethylase are conserved or variable within the species. Gene expression microarrays were hybridized with RNA samples from the inbred lines B73 and Mo17, and from near-isogenic derivatives containing the loss-of-function allele zmet2-m1. A set of 126 genes that displayed statistically significant differential expression in zmet2 mutants relative to wild-type plants in at least one of the two genetic backgrounds were identified. Analysis of the transcript levels in both wild-type and mutant individuals revealed that only 10% of these genes were affected in zmet2 mutants in both B73 and Mo17 genetic backgrounds. Over 80% of the genes with expression patterns affected by zmet2 mutations display variation for gene expression between wild-type B73 and Mo17 plants. Further analysis was performed for seven genes that were transcriptionally silent in wild-type B73, but expressed in B73 zmet2-m1, wild-type Mo17 and Mo17 zmet2-m1 lines. Mapping experiments confirmed that the expression differences in wild-type B73 relative to Mo17 inbreds for these genes were caused by cis-acting regulatory variation. Methylation-sensitive PCR and bisulphite sequencing demonstrated that for five of these genes the CpNpG methylation in the wild-type B73 genetic background was substantially decreased in the B73 zmet2-m1 mutant and in wild-type Mo17. A survey of eight maize inbreds reveals that each of these five genes exhibit transcriptionally silent and methylated states in some inbred lines and unmethylated, expressed states in other inbreds, providing evidence for natural variation in epigenetic states for some maize genes.
Keywords: mutant versus wild-type comparison in two inbred genotypes
 
Overall design The zmet2-m1 mutant allele was backcrossed into two inbred backgrounds, B73 and Mo17. RNA was isolated from 6 biological replicates of B73 wild-type plants, 6 biological replicates of B73 zmet2-m1 mutant plants; 3 biological replicates of Mo17 wild-type plants and 3 biological replicates of Mo17 zmet2-m1 mutant plants.
 
Contributor(s) Makarevitch I, Stupar RM, Springer NM
Citation(s) 17660570
Submission date Jun 20, 2007
Last update date Apr 23, 2013
Contact name Nathan M Springer
E-mail(s) springer@umn.edu
Phone 6126246241
Fax 6126251738
Organization name University of Minnesota
Department Plant Biology
Street address 1445 Gortner Ave
City Saint Paul
State/province MN
ZIP/Postal code 55108
Country USA
 
Platforms (1)
GPL4032 [Maize] Affymetrix Maize Genome Array
Samples (18)
GSM202278 B73 11-day seedling aerial tissue biological replicate 1
GSM202282 B73 11-day seedling aerial tissue biological replicate 2
GSM202286 B73 11-day seedling aerial tissue biological replicate 3
Relations
BioProject PRJNA101093

Download family Format
SOFT formatted family file(s) SOFTHelp
MINiML formatted family file(s) MINiMLHelp
Series Matrix File(s) TXTHelp

Supplementary file Size Download File type/resource
GSE8188_RAW.tar 161.6 Mb (http)(custom) TAR (of CEL, CHP)
Processed data included within Sample table
Processed data provided as supplementary file
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