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Using Ex Vivo Upright Droplet Cultures of Whole Fetal Organs to Study Developmental Processes during Mouse Organogenesis
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Thoc1 deficiency compromises gene expression necessary for normal testis development in the mouse.

Xiaoling Wang1, Meenalakshmi Chinnam, Jianmin Wang

  • 1Department of Pharmacology & Therapeutics, Roswell Park Cancer Institute, Elm & Carlton Streets, Buffalo, NY 14263, USA.

Molecular and Cellular Biology
|March 25, 2009
PubMed
Summary

Thoc1, a key part of the TREX complex, is vital for RNA processing and gene expression. Mice with reduced Thoc1 show normal development but impaired male fertility due to disrupted spermatocyte differentiation.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • RNA processing and ribonucleoprotein complex (RNP) biogenesis are crucial for coordinated gene expression.
  • Defects in RNP biogenesis are hypothesized to impair specific gene expression programs.
  • The TREX complex, including Thoc1, is involved in RNP assembly and RNA processing during transcription.

Purpose of the Study:

  • To investigate the role of RNP biogenesis in mammalian development by studying mice with reduced Thoc1 expression.
  • To determine the consequences of impaired Thoc1 function on tissue development and reproductive capabilities.

Main Methods:

  • Generation and characterization of mice hypomorphic for Thoc1.
  • Analysis of Thoc1 expression levels in various tissues.
  • Assessment of developmental and gametogenic phenotypes in Thoc1-deficient mice.
  • Examination of gene expression patterns in affected tissues.

Main Results:

  • Hypomorphic Thoc1 mice are viable with significantly reduced Thoc1 expression.
  • Most tissues develop and function normally, but gametogenesis is severely compromised.
  • Male infertility is linked to reduced spermatocyte viability and abnormal endocrine signaling.
  • Defects in gene expression required for testicular cell differentiation are observed, with some genes identified as Thoc1 targets.

Conclusions:

  • Thoc1-mediated RNP assembly is essential for the coordinated expression of genes critical for normal differentiation and development.
  • Impaired Thoc1 function specifically impacts gametogenesis, highlighting its importance in reproductive biology.
  • These findings underscore the role of RNA processing machinery in ensuring developmental fidelity in vivo.