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Inter-strain expression of sequence-diverse HET domain genes severely inhibits growth of Aspergillus oryzae.

In the Pezizomycotina (filamentous ascomycete) species, genes that encode proteins with an HET domain (Pfam: PF06985) are reportedly involved in heterokaryon incompatibility (HI) in which cell death or growth defects are induced after fusion of cells that are genetically incompatible owing to diversities in their nucleotide sequence. HET domain genes are commonly found in Pezizomycotina genomes and are functionally characterized in only a few species. Here, we compared 44 HET domain genes between an incompatible strain pair of Aspergillus oryzae RIB40 and RIB128 and performed inter-strain expression of 37 sequence-diverse genes for mimicking HI. Four HET domain genes were identified to cause severe growth inhibition in a strain- or sequence-specific manner. Furthermore, SNPs responsible for the inhibition of cell growth were identified. This study provides an important insight into the physiological significance of sequence diversity of HET domain genes and their potential functions in HI of A. oryzae.

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