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Tissue-Specific Requirement for the GINS Complex During Zebrafish Development.

Máté Varga1,2, Kitti Csályi1, István Bertyák1

  • 1Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary.

Frontiers in Cell and Developmental Biology
|June 18, 2020
PubMed
Summary
This summary is machine-generated.

DNA replication requires the GINS complex for stem cell survival. Loss of GINS function impairs DNA replication and increases apoptosis in the central nervous system, but may not be essential during early zebrafish development.

Keywords:
CMG complexGINS complexGINS2proliferationreplicationzebrafish

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • DNA replication is crucial for stem and progenitor cell proliferation and survival.
  • The CMG complex, including GINS, Cdc45, and Mcm helicase, is essential for initiating DNA unwinding.
  • The precise role of GINS in DNA replication, particularly in vivo, requires further elucidation.

Purpose of the Study:

  • To investigate the necessity of GINS function for DNA replication and cell survival in stem and progenitor cells.
  • To examine the consequences of GINS deficiency on apoptosis in the central nervous system (CNS).
  • To explore the potential dispensability of the canonical GINS complex during early embryonic development in zebrafish.

Main Methods:

  • Utilized genetic mutations in GINS1 and GINS2 in zebrafish models.
  • Assessed DNA replication efficiency and cell proliferation.
  • Quantified apoptosis levels in actively proliferating regions of the CNS.
  • Examined the presence of zygotic Gins1 and Gins2 isoforms during early zebrafish development.

Main Results:

  • Absence of GINS function leads to cell-autonomous impairment of DNA replication.
  • gins1 and gins2 mutants display increased apoptosis specifically in proliferating CNS regions.
  • Zygotic Gins1 and Gins2 isoforms appear to be absent during rapid early embryonic cell cycles in zebrafish.

Conclusions:

  • GINS function is critical for DNA replication and survival of stem and progenitor cells, with its absence leading to CNS-specific apoptosis.
  • Early zebrafish development, characterized by rapid cell cycles, may not rely on the canonical GINS complex for DNA replication.