Unknown,Transcriptomics,Genomics,Proteomics

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Yeast gene expression profiles of pressure-sensitive mutant strain

ABSTRACT: High hydrostatic pressure causes physical stress to organisms, and it induces growth inhibition and cellular death. For Saccharomyces cerevisiae, more than 150 MPa at room temperature is lethal conditions. To understand the mechanism of pressure inactivation, we isolated pressure-sensitive mutant strain of S. cerevisiae and analyzed genome-wide mRNA expression profiles using DNA microarray. Mutant strain and parent strain were grown in YPD medium at 30Â°C for 48 h. Series contains four hybridization results from independent biological samples respectively in both strains of pressure-sensitive mutant strain and that parent strain.

ORGANISM(S): Saccharomyces cerevisiae

SUBMITTER: Kazuki Nomura

PROVIDER: E-GEOD-55120 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The Hos: HR-1 mouse strain (HR-1) is an autosomal resessive mutant strain which is widely used in pharmacological and dermatological studies in Japan. Although HR-1 mice have been believed to be Hr gene mutants based on their distinctive alopecia phenotype, there are no reports on either the genetic nature of the Hr gene or mechanism of alopecia. The present study clarified that the HR-1 mice carry a C to T transition in the Hr gene, which causes a proline to serin amino acid change in the functional domain of translated HR protein. It is well known that HR plays an important role in hair follicle regression, and loss of HR function triggers distinctive alopecia with the presence of premature apoptosis in the regressing hair follicle. However, the detailed function of HR protein is still uncertain. To clarify the mechanism by which HR dysfunction causes hair loss, here we performed microarray analysis on the mRNA samples obtained from the regressing hair follicles of the homozygous (HrHos / HrHos) and heterozygous (+/HrHos, control) Hr mutant mice using laser capture microdissection. Our results showed increased expression of apoptosis-related and cell-cycle-repressive genes and decreased expression of cell-cycle-promoting genes, suggesting inhibition of the cell cycle at G0/G1. These findings strongly suggest that the loss of HR function leads to high expression of cell cycle inhibitors, resulting in the hair loss with premature apoptosis in the hair matrix. Experiment Overall Design: Homozygous (HrHos / HrHos) and heterozygous (+/HrHos) Hr mutant mice of the same N1 littermates obtained from a male Hos: HR-1 mouse and a female heterozygous F1 offspring (+/HrHos) between an HR-1 mouse and an ICR mouse were used at day 14 postpartum. +/HrHos mice were used as controls because the Hr gene mutantion is autosomal recessive and the morphological appearance of +/HrHos is as same as that of wild-type mice. Four samples (two from +/HrHos and two from HrHos / HrHos) were analyzed. All RNA samples were extracted from hair follicles of dorsal skin using Laser capture microdissection.

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Yeast gene expression profiles of pressure-sensitive mutant strain

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