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Translation01:31

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Lesson: Translation
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A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene
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Autosomal recessive POLR1D mutation with decrease of TCOF1 mRNA is responsible for Treacher Collins syndrome.

Elise Schaefer1, Corinne Collet2, David Genevieve3

  • 11] Service de Génétique Médicale, Hôpitaux Universitaires de Strasbourg, CHU de Hautepierre, Strasbourg, France [2] Laboratoire de Génétique Médicale, INSERM U1112, Faculté de Médecine, Université de Strasbourg, Strasbourg, France.

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Summary

This study identifies a novel homozygous POLR1D mutation causing autosomal recessive Treacher Collins syndrome. This finding expands the genetic understanding of this rare mandibulofacial dysostosis.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Treacher Collins syndrome is a mandibulofacial dysostosis.
  • Mutations in TCOF1 account for ~80% of cases, typically inherited in an autosomal dominant manner.
  • POLR1D and POLR1C mutations have been reported in a small percentage of patients.

Purpose of the Study:

  • To investigate the genetic basis of Treacher Collins syndrome in two consanguineous families.
  • To identify novel gene mutations responsible for the disorder.
  • To elucidate the inheritance pattern and molecular mechanisms.

Main Methods:

  • Direct sequencing of TCOF1, POLR1C, and POLR1D genes.
  • Analysis of genetic variants in affected individuals from two families.
  • Functional analysis of TCOF1 transcripts using real-time quantitative reverse transcription-polymerase chain reaction.

Main Results:

  • A shared homozygous mutation (c.163C>G, p.Leu55Val) in POLR1D was identified in four affected children.
  • This POLR1D mutation affects the RNA polymerase dimerization domain, potentially impairing ribosome biogenesis.
  • Functional analysis showed a 50% reduction in TCOF1 transcripts in the index case, supporting the proposed mechanism.

Conclusions:

  • This study reports the first instance of a POLR1D mutation causing autosomal recessive Treacher Collins syndrome.
  • The findings highlight the genetic heterogeneity of Treacher Collins syndrome.
  • Emphasizes the importance of integrated clinical and molecular analysis for accurate genetic diagnosis and counseling.