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Mol Microbiol. 2001 Jan;39(1):54-64.

pah1: a homeobox gene involved in hyphal morphology and microconidiogenesis in the filamentous ascomycete Podospora anserina.

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1
Institut de Génétique et Microbiologie, Bâtiment 400, Université Paris-Sud, UMR 8621, 91405 Orsay Cedex, France. arnaise@igmors.u-psud.fr

Abstract

Homeobox-containing genes are widely described among eukaryotic species other than filamentous ascomycetes. We describe here the isolation and characterization of the first homeobox gene (pah1) identified in a filamentous ascomycete. It encodes a putative protein of 610 amino acids containing a typical homeodomain with 60 amino acids. Deletion of the pah1 gene enhances the number of male gametes (microconidia), whereas overexpression of pah1 results in a decrease in microconidia. These results led us to suppose that pah1 may be a repressor of genes involved in the microconidiation process. Moreover, pah1 is involved in hyphal branching and possibly in the development of female organs.

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