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Related Concept Videos

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
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Crossovers are regulated by a conserved and disordered synaptonemal complex domain.

Ana Rita Rodrigues Neves1,2, Ivana Čavka1,2, Tobias Rausch3,4

  • 1Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), 69117 Heidelberg, Germany.

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|February 18, 2025
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Summary

A disordered C-terminal domain of the synaptonemal complex protein SYP-4 is essential for regulating meiotic crossovers (COs) and ensuring genomic stability. Nine phenylalanines in this domain recruit factors that control CO formation.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Meiosis requires precise regulation of crossover (CO) number and distribution for genomic stability.
  • The synaptonemal complex (SC) is a key structure involved in homologous chromosome pairing and recombination.
  • CO assurance and interference are critical processes ensuring proper CO formation.

Purpose of the Study:

  • To investigate the role of the C-terminus of the SC central element protein SYP-4 in regulating meiotic crossovers.
  • To identify the molecular mechanisms underlying CO regulation by SYP-4.

Main Methods:

  • Analysis of SYP-4 C-terminal domain mutations in Caenorhabditis elegans.
  • Investigating the role of phosphorylation and conserved phenylalanines.
  • Identifying interacting factors of the SYP-4 C-terminus.

Main Results:

  • A disordered, conserved C-terminal domain of SYP-4 is crucial for CO assurance and interference, but not synapsis.
  • Phosphorylation is not the primary regulator; nine conserved phenylalanines are essential.
  • These phenylalanines recruit a pro-CO factor, likely an E3 ligase, and influence SC physical properties.

Conclusions:

  • The SYP-4 C-terminal domain acts as a critical regulatory hub for CO formation.
  • This domain maintains the SC in a state conducive to signaling for CO regulation.
  • Proper CO regulation by the SC is vital for safeguarding the genome across generations.