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Functional Interplay of Two Paralogs Encoding SWI/SNF Chromatin-Remodeling Accessory Subunits During Caenorhabditis

Iris Ertl1, Montserrat Porta-de-la-Riva2, Eva Gómez-Orte3

  • 1Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, 08908 L'Hospitalet de Llobregat, Barcelona, Spain.

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The Caenorhabditis elegans genes ham-3 and swsn-2.2, encoding SWI/SNF complex subunits, show functional redundancy in development but distinct roles in embryogenesis, impacting cell division and chromosome segregation.

Keywords:
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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • SWI/SNF ATP-dependent chromatin-remodeling complexes are crucial for cellular processes.
  • The Caenorhabditis elegans genes ham-3 (swsn-2.1) and swsn-2.2 encode accessory subunits of these complexes.
  • These subunits may function mutually exclusively within SWI/SNF complexes.

Purpose of the Study:

  • To investigate the distinct functions of ham-3 and swsn-2.2 during C. elegans development.
  • To explore functional redundancy and specific roles of these paralogous genes.
  • To identify interacting proteins and understand their roles in cell division and chromosome regulation.

Main Methods:

  • RNA interference (RNAi) assays and analysis of diverse mutant alleles.
  • RNA sequencing to assess gene expression changes.
  • Cell lineage analysis and proteomic approaches to identify protein interactions.

Main Results:

  • ham-3 and swsn-2.2 exhibit similar functions in vulva specification, germline development, and intestinal cell proliferation.
  • Distinct roles were observed in embryonic development, with ham-3 mutants showing intestinal cell hyper-proliferation and swsn-2.2 mutants exhibiting defects in cell division.
  • SWSN-2.2 interacts with proteins like SAO-1, ATX-2, and MEL-28, and is essential for chromosome segregation and nuclear reassembly.

Conclusions:

  • ham-3 and swsn-2.2 display both functional redundancy and distinct roles in C. elegans development.
  • SWSN-2.2 plays a critical role in embryonic cell division, chromosome segregation, and nuclear envelope formation, interacting with MEL-28.
  • These findings highlight the complex regulatory roles of SWI/SNF subunits in development.