Budding yeast SSD1-V regulates transcript levels of many longevity genes and extends chronological life span in purified quiescent cells.
Ssd1 is an RNA-binding protein that affects literally hundreds of different processes and is polymorphic in both wild and lab yeast strains. We have used transcript microarrays to compare mRNA levels in an isogenic pair of mutant (ssd1-d) and wild-type (SSD1-V) cells across the cell cycle. We find that 15% of transcripts are differentially expressed, but there is no correlation with those mRNAs bound by Ssd1. About 20% of cell cycle regulated transcripts are affected, and most show sharper amplitudes of oscillation in SSD1-V cells. Many transcripts whose gene products influence longevity are also affected, the largest class of which is involved in translation. Ribosomal protein mRNAs are globally down-regulated by SSD1-V. SSD1-V has been shown to increase replicative life span currency and we show that SSD1-V also dramatically increases chronological life span (CLS). Using a new assay of CLS in pure populations of quiescent prototrophs, we find that the CLS for SSD1-V cells is twice that of ssd1-d cells.
Li
Lihong
L
Fred Hutchinson Cancer Research Center, Basic Sciences Division, Seattle, WA 98109, USA.
Lu
Yong
Y
Qin
Li-Xuan
LX
Bar-Joseph
Ziv
Z
Werner-Washburne
Margaret
M
Breeden
Linda L
LL
D002453:Cell Cycle / Q000502:physiology; D016000:Cluster Analysis; D020869:Gene Expression Profiling; D015966:Gene Expression Regulation, Fungal; D008136:Longevity / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D011110:Polymorphism, Genetic; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012269:Ribosomal Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000502:physiology; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism
D020033:Protein Isoforms; D012269:Ribosomal Proteins; D029701:Saccharomyces cerevisiae Proteins; C485219:Ssd1 protein, S cerevisiae