Quantitative analysis of yeast internal architecture using soft X-ray tomography.

Area of Science:

• Cell Biology
• Microscopy and Imaging
• Yeast Genetics

Background:

• Cell size and organelle volume are critical for yeast cell division, function, and viability.
• Understanding these cellular parameters is essential for advancing yeast biology research.

Purpose of the Study:

• To quantitatively measure cell size and organelle volumes in various yeast models using soft X-ray tomography (SXT).
• To investigate the relationships between cellular and organelle volumes across different yeast strains, ploidy, and cell cycle stages.
• To determine if volumetric ratios are conserved across diverse yeast species and morphologies.

Main Methods:

• Utilized high-resolution, quantitative soft X-ray tomography (SXT) for imaging yeast specimens in a near-native state.
• Analyzed haploid and diploid strains of Saccharomyces cerevisiae at key cell cycle stages.
• Compared SXT data from S. cerevisiae with Schizosaccharomyces pombe, Candida albicans phenotypes, and a coff1-22 mutant strain.

Main Results:

• Established quantitative relationships between cellular and organelle volumes in Saccharomyces cerevisiae.
• Demonstrated that volumetric ratios remained invariant across different yeast strains, including S. cerevisiae, S. pombe, and C. albicans.
• Observed consistent volumetric ratios irrespective of yeast ploidy or morphology.

Conclusions:

• Volumetric ratios of cellular components are conserved across diverse yeast species, ploidy, and morphologies.
• These invariant volumetric ratios represent a fundamental characteristic of yeast cellular organization.
• Soft X-ray tomography (SXT) is a powerful tool for quantitative analysis of yeast cell parameters.