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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Related Experiment Video

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Single Molecule Fluorescence In Situ Hybridization smFISH Analysis in Budding Yeast Vegetative Growth and Meiosis
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Pervasive, Coordinated Protein-Level Changes Driven by Transcript Isoform Switching during Meiosis.

Ze Cheng1, George Maxwell Otto1, Emily Nicole Powers1

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.

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Summary

Gene expression regulation is more complex than previously thought. A study in budding yeast reveals a novel mechanism where transcript type, not just abundance, controls protein levels during development.

Keywords:
LUTIcoordinationdifferentiationgene expressionisoformmeiosisribosome profilingtranscription factortranslationuORF

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Understanding gene regulatory mechanisms is crucial for deciphering developmental processes.
  • Existing models primarily focus on mRNA levels to predict protein production.

Purpose of the Study:

  • To investigate genome-wide gene regulatory mechanisms during meiotic differentiation in budding yeast.
  • To simultaneously measure mRNA, translation, and protein levels.

Main Methods:

  • Simultaneous genome-wide measurements of mRNA, translation, and protein.
  • Analysis of meiotic differentiation in budding yeast.
  • Identification of anti-correlated mRNA and protein levels.

Main Results:

  • Hundreds of mRNAs showed anti-correlation with their protein products.
  • Over 8% of measured genes (at least 380) utilize a novel regulatory mechanism.
  • This mechanism involves switching between translatable and non-translatable mRNA isoforms.
  • A single transcription factor can coordinate protein synthesis activation and repression.

Conclusions:

  • Gene regulation during development involves a pervasive mechanism modulating protein levels via transcript isoform switching.
  • The type of transcript produced, not solely mRNA induction, dictates protein synthesis.
  • This discovery offers a new perspective on post-transcriptional gene regulation.