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Nucleosome Remodeling02:54

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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Related Experiment Video

Updated: Sep 4, 2025

Rapid Analysis of Chromosome Aberrations in Mouse B Lymphocytes by PNA-FISH
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Rapid Analysis of Chromosome Aberrations in Mouse B Lymphocytes by PNA-FISH

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An RNF12-USP26 amplification loop drives germ cell specification and is disrupted by disease-associated mutations.

Anna Segarra-Fas1, Carmen Espejo-Serrano1, Francisco Bustos1

  • 1MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.

Science Signaling
|July 20, 2022
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Summary
This summary is machine-generated.

The RNF12-USP26 pathway regulates gametogenesis and germ cell differentiation. Disruptions in this axis are linked to Tonne-Kalscheuer syndrome and infertility.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • RNF12 (Regulator of Nucleus, X-linked) is an E3 ubiquitin ligase crucial for development.
  • Mutations in the RLIM gene, encoding RNF12, cause Tonne-Kalscheuer syndrome (TOKAS).
  • REX1 is a pluripotency-associated transcriptional repressor and a known RNF12 substrate.

Purpose of the Study:

  • To investigate the downstream targets and regulatory mechanisms of RNF12.
  • To elucidate the role of the RNF12-USP26 interaction in gametogenesis.
  • To explore the link between RNF12-USP26 pathway dysfunction and human genetic disorders.

Main Methods:

  • Global quantitative proteomics in male mouse embryonic stem cells.
  • Identification and characterization of RNF12-USP26 complexes.
  • In vitro studies on germ cell differentiation and gametogenesis gene expression.

Main Results:

  • USP26 was identified as a downstream target of RNF12.
  • RNF12-USP26 interaction forms a feed-forward loop, enhancing RNF12 activity and derepressing REX1 targets.
  • The RNF12-USP26 axis is essential for spermatogenesis and germ cell differentiation in mice.
  • RLIM and USP26 variants disrupt this axis in TOKAS and infertility patients.

Conclusions:

  • The ubiquitylation cycle involves synergistic interactions, exemplified by the RNF12-USP26 axis, which is critical for gametogenesis.
  • Dysregulation of the RNF12-USP26 pathway contributes to human developmental disorders like TOKAS and infertility.