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Title: Polarized gene expression determines Woronin body formation at the leading edge of the fungal colony
Authors: Tey, W.K.
North, A.J.
Reyes, J.L.
Lu, Y.F.
Jedd, G. 
Issue Date: 2005
Citation: Tey, W.K., North, A.J., Reyes, J.L., Lu, Y.F., Jedd, G. (2005). Polarized gene expression determines Woronin body formation at the leading edge of the fungal colony. Molecular Biology of the Cell 16 (6) : 2651-2659. ScholarBank@NUS Repository.
Abstract: The Woronin body (WB) is a peroxisome-related organelle that is centered on a crystalline core of the HEX-1 protein, which functions to seal septal pores of filamentous ascomycetes in response to cellular damage. Here, we investigate the cellular and genetic control of WB-formation and show that polarized hex-1 gene expression determines WB-biogenesis at the growing hyphal apex. We find that intron splicing is coupled to efficient hex-1 gene expression and strikingly, when the yellow fluorescent protein was expressed from hex-1 regulatory sequences, we observed a fluorescent gradient that was maximal in apical cells. Moreover, endogenous hex-1 transcripts were specifically enriched at the leading edge of the fungal colony, whereas other transcripts accumulated in basal regions. Time-lapse confocal microscopy showed that HEX-1 crystals normally formed in the vicinity of the hyphal apex in large peroxisomes, which matured and were immobilized at the cell periphery as cells underwent septation. When the hex-1 structural gene was expressed from regulatory sequences of an abundant, basally localized transcript, WB-core formation was redetermined to basal regions of the colony, and these strains displayed loss-of-function phenotypes specifically in apical hyphal compartments. These results show that apically localized gene expression is a key determinant of spatially restricted WB-assembly. We suggest that this type of regulation may be widely used to determine cellular activity in apical regions of the fungal hypha. © 2005 by The American Society for Cell Biology.
Source Title: Molecular Biology of the Cell
ISSN: 10591524
DOI: 10.1091/mbc.E04-10-0937
Appears in Collections:Staff Publications

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