Open Access

Phylogenetic origin and transcriptional regulation at the post-diauxic phase of SPI1, in Saccharomyces cerevisiae

Cellular & Molecular Biology LettersAn International Journal201217:17

DOI: 10.2478/s11658-012-0017-4

Received: 21 January 2012

Accepted: 11 May 2012

Published: 18 May 2012


The gene SPI1, of Saccharomyces cerevisiae, encodes a cell wall protein that is induced in several stress conditions, particularly in the postdiauxic and stationary phases of growth. It has a paralogue, SED1, which shows some common features in expression regulation and in the null mutant phenotype. In this work we have identified homologues in other species of yeasts and filamentous fungi, and we have also elucidated some aspects of the origin of SPI1, by duplication and diversification of SED1. In terms of regulation, we have found that the expression in the post-diauxic phase is regulated by genes related to the PKA pathway and stress response (MSN2/4, YAK1, POP2, SOK2, PHD1, and PHO84) and by genes involved in the PKC pathway (WSC2, PKC1, and MPK1).

Key words

SPI1 Phylogenetic origin Transcriptional regulation Post-diauxic Nutrient starvation PKA PKC