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Series GSE27484 Query DataSets for GSE27484
Status Public on Mar 07, 2012
Title Effect of sexual recombination on population diversity in aflatoxin production by Aspergillus flavus and evidence for cryptic heterokaryosis
Platform organisms Zea mays; Aspergillus flavus; Aspergillus oryzae
Sample organism Aspergillus flavus
Experiment type Genome variation profiling by array
Summary Aspergillus flavus is the major producer of carcinogenic aflatoxins in crops worldwide. Natural populations of A. flavus show tremendous variation in aflatoxin production some of which can be attributed to extreme environmental conditions (e.g., drought), differential regulation of the aflatoxin biosynthetic pathway, missing cluster genes or loss-of-function mutations. Understanding the evolutionary processes that generate genetic diversity in A. flavus may also explain quantitative and qualitative differences in aflatoxigenicity. Several population studies provide indirect evidence of recombination in the aflatoxin gene cluster and genome-wide, using multilocus genealogical approaches. More recently A. flavus has been shown to be functionally heterothallic and capable of sexual reproduction in laboratory crosses. In the present study, we characterize the progeny from nine A. flavus crosses and show that crossovers in the aflatoxin cluster coincide with inferred recombination blocks and hotspots in natural populations, which suggests that recombination in the cluster is primarily driven by sex. Moreover, we show that a single crossover event in the cluster can restore aflatoxigenicity, which is significant as mycotoxin production in A. flavus is highly heritable. aCGH was used to corroborate inferences from cluster-based MLSTs and to possibly identify additional crosovers within the cluster.
Overall design aCGH comparison between 3 strains of A. flavus: 2 parental (P) and 1 progeny (F1) analyzed at the probe level. A total of 9 trio comparisons were made from a total of 18 isolates analyzed by aCGH. Trio comparisons are as follows: IC278 (P), IC1179 (P) and IC1650 (F1); IC201 (P), IC310 (P) and IC1719 (F1); IC307 (P), IC308 (P) and IC1751 (F1); IC277 (P), IC311 (P) and IC1766 (F1); IC277 (P), IC311 (P) and IC1775 (F1); IC244 (P), IC277 (P) and IC2205 (F1); IC244 (P), IC277 (P) and IC2207 (F1); IC301 (P), IC1179 (P) and IC2171 (F1); and finally IC244 (P), IC277 (P) and IC2209 (F1).
Contributor(s) Olarte RA, Horn BW, Dorner JW, Monacell JT, Singh R, Stone EA, Carbone I
Citation(s) 22212063
Submission date Feb 24, 2011
Last update date Jun 06, 2012
Contact name Ignazio Carbone
Phone 919-513-4866
Organization name North Carolina State University - Center for Integrated Fungal Research
Department Plant Pathology
Lab Ignazio Carbone
Street address 851 Main Campus Drive, Suite 233
City Raleigh
State/province NC
ZIP/Postal code 27606
Country USA
Platforms (1)
GPL13221 NCSU Payne_Aspergillus Flavus_22683_AFLAVUSa520391F [probe-level]
Samples (19)
GSM679190 IC201
GSM679191 IC244
GSM679192 IC277
BioProject PRJNA138593

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Supplementary file Size Download File type/resource
GSE27484_RAW.tar 40.6 Mb (http)(custom) TAR (of CEL)
Processed data included within Sample table

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