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Mol Cell Biol, May 1998, p. 2884-2891, Vol. 18, No. 5
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Ash1, a Daughter Cell-Specific Protein, Is Required for Pseudohyphal Growth of Saccharomyces cerevisiae

Sarat Chandarlapaty and Beverly Errede*

Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599-7260

Received 17 November 1997/Returned for modification 9 January 1998/Accepted 3 February 1998

Ash1 (for asymmetric synthesis of HO) was first uncovered in genetic screens that revealed its role in mating-type switching. Ash1 prevents HO expression in daughter cells. Because Ash1 has a zinc finger-like domain related to that of the GATA family of transcription factors, it presumably acts by repressing HO transcription. Nonswitching diploid cells also express Ash1, suggesting it could have functions in addition to regulation of HO expression. We show here that Ash1 has an essential function for pseudohyphal growth. Our epistasis analyses are consistent with the deduction that Ash1 acts separately from the mitogen-activated protein kinase cascade and Ste12. Similarly to the case in yeast form cells, Ash1 is asymmetrically localized to the nuclei of daughter cells during pseudohyphal growth. This asymmetric localization reveals that there is a previously unsuspected daughter cell-specific function necessary for pseudohyphal growth.

* Corresponding author. Mailing address: Department of Biochemistry and Biophysics CB#7260, University of North Carolina, Chapel Hill, NC 27599-7260. Phone: (919) 966-3628. Fax: (919) 966-4812. E-mail: errede{at}nun.oit.unc.edu.

Mol Cell Biol, May 1998, p. 2884-2891, Vol. 18, No. 5
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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