Opposing functions of Fng1 and the Rpd3 HDAC complex in H4 acetylation in Fusarium graminearum

English version

Autoři: Hang Jiang ^aff001; Aliang Xia ^aff001; Meng Ye ^aff001; Jingyi Ren ^aff001; Dongao Li ^aff001; Huiquan Liu ^aff001; Qinhu Wang ^aff001; Ping Lu ^aff001; Chunlan Wu ^aff001; Jin-Rong Xu ^aff002; Cong Jiang ^aff001
Působiště autorů: State Key Laboratory of Crop Stress Biology for Arid Areas and NWAFU-Purdue Joint Research Center, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China ^aff001; Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, United States of America ^aff002
Vyšlo v časopise: Opposing functions of Fng1 and the Rpd3 HDAC complex in H4 acetylation in Fusarium graminearum. PLoS Genet 16(11): e32767. doi:10.1371/journal.pgen.1009185
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1009185

Souhrn

Histone acetylation, balanced by histone acetyltransferase (HAT) and histone deacetylase (HDAC) complexes, affects dynamic transitions of chromatin structure to regulate transcriptional accessibility. However, little is known about the interplay between HAT and HDAC complexes in Fusarium graminearum, a causal agent of Fusarium Head Blight (FHB) that uniquely contains chromosomal regions enriched for house-keeping or infection-related genes. In this study, we identified the ortholog of the human inhibitor of growth (ING1) gene in F. graminearum (FNG1) and found that it specifically interacts with the FgEsa1 HAT of the NuA4 complex. Deletion of FNG1 led to severe growth defects and blocked conidiation, sexual reproduction, DON production, and plant infection. The fng1 mutant was normal in H3 acetylation but significantly reduced in H4 acetylation. A total of 34 spontaneous suppressors of fng1 with faster growth rate were isolated. Most of them were still defective in sexual reproduction and plant infection. Thirty two of them had mutations in orthologs of yeast RPD3, SIN3, and SDS3, three key components of the yeast Rpd3L HDAC complex. Four mutations in these three genes were verified to suppress the defects of fng1 mutant in growth and H4 acetylation. The rest two suppressor strains had a frameshift or nonsense mutation in a glutamine-rich hypothetical protein that may be a novel component of the FgRpd3 HDAC complex in filamentous fungi. FgRpd3, like Fng1, localized in euchromatin. Deletion of FgRPD3 resulted in severe growth defects and elevated H4 acetylation. In contract, the Fgsds3 deletion mutant had only a minor reduction in growth rate but FgSIN3 appeared to be an essential gene. RNA-seq analysis revealed that 48.1% and 54.2% of the genes with altered expression levels in the fng1 mutant were recovered to normal expression levels in two suppressor strains with mutations in FgRPD3 and FgSDS3, respectively. Taken together, our data showed that Fng1 is important for H4 acetylation as a component of the NuA4 complex and functionally related to the FgRpd3 HDAC complex for transcriptional regulation of genes important for growth, conidiation, sexual reproduction, and plant infection in F. graminearum.

Klíčová slova:

Acetylation – Fusarium graminearum – Gene expression – Histones – Nonsense mutation – Saccharomyces cerevisiae – Suppressor genes – Wheat

Zdroje

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