dateReleased: |
04-29-2012
|
description: |
The potential for sexual reproduction in Aspergillus oryzae was assessed by investigating the presence and functionality of MAT genes. Previous genome studies had identified a MAT1-1 gene in the RIB40 reference strain. We now report the existence of a complimentary MAT1-2 gene and sequencing of an idiomorph region from A. oryzae strain AO6. This allowed the development of a PCR diagnostic assay, which detected isolates of MAT1-1 and MAT1-2 genotype among 180 strains assayed including industrial tane-koji isolates. Strains used for sake and miso production showed a near 1:1 ratio of MAT1-1 and MAT1-2 mating-types, whereas strains used for soy sauce production showed a significant bias towards the MAT1-2 mating type. MAT1-1 and MAT1-2 isogenic strains were then created by genetic manipulation of the resident idiomorph, and comparisons were made of gene expression by DNA microarray and RT-PCR methodologies under conditions when MAT genes were expressed. 33 genes were found to be up-regulated greater than 10-fold in either the MAT1-1 host or MAT1-2 gene replacement strains relative to each other, showing that both MAT1-1 and MAT1-2 genes functionally regulate gene expression in A. oryzae in a mating-type dependent manner, the first such report from a supposedly asexual fungus. MAT1-1 expression specifically up-regulated an a-pheromone precursor gene, but most genes affected were of unknown function. Results are consistent with a heterothallic breeding system in A. oryzae, and prospects for the discovery of a sexual cycle are discussed. On a condition that induces mating-type genes descrived in growth protocol section, each cogenic MAT1-1 and MAT1-2 mating-type strains were processed into RNA extraction and hybridization on Affymetrix microarrays. In a speculation that genes involved in putative mating process were reguated in mating-type dependent manner, we designed the cogenic strains that differs only in mating-type gene locus to analyze differential gene expression of MAT1-1 vs MAT1-2 strains.
|
privacy: |
not applicable
|
aggregation: |
instance of dataset
|
ID: |
E-GEOD-33542
|
refinement: |
raw
|
alternateIdentifiers: |
33542
|
keywords: |
functional genomics
|
dateModified: |
06-25-2012
|
availability: |
available
|
types: |
gene expression
|
name: |
Aspergillus oryzae
|
ID: |
A-GEOD-13996
|
name: |
Affymetrix Aspergillus oryzae custom array
|
accessURL: | https://www.ebi.ac.uk/arrayexpress/files/E-GEOD-33542/E-GEOD-33542.raw.1.zip |
storedIn: |
ArrayExpress
|
qualifier: |
gzip compressed
|
format: |
TXT
|
accessType: |
download
|
authentication: |
none
|
authorization: |
none
|
accessURL: | https://www.ebi.ac.uk/arrayexpress/files/E-GEOD-33542/E-GEOD-33542.processed.1.zip |
storedIn: |
ArrayExpress
|
qualifier: |
gzip compressed
|
format: |
TXT
|
accessType: |
download
|
authentication: |
none
|
authorization: |
none
|
accessURL: | https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE33542 |
storedIn: |
Gene Expression Omnibus
|
qualifier: |
not compressed
|
format: |
HTML
|
accessType: |
landing page
|
primary: |
true
|
authentication: |
none
|
authorization: |
none
|
abbreviation: |
EBI
|
homePage: | http://www.ebi.ac.uk/ |
ID: |
SCR:004727
|
name: |
European Bioinformatics Institute
|
homePage: | https://www.ebi.ac.uk/arrayexpress/ |
ID: |
SCR:002964
|
name: |
ArrayExpress
|