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Analysis of Treacher Collins syndrome 4-associated mutations in Schizosaccharomyces pombe
1Department of Biochemistry, Shimane University School of Medicine, Izumo, Japan.
Abstract:
Treacher Collins syndrome (TCS) is a rare congenital disorder characterized by craniofacial deformities. Although mutations in several genes involved in ribosome biogenesis have been identified in patients with TCS, the molecular mechanisms underlying their effects remain poorly understood. In this study, we analyzed the effects of TCS type 4 (TCS4)-associated mutations in Schizosaccharomyces pombe by introducing R1022C or R1022S mutations into Rpa2, the second-largest subunit of RNA polymerase I (Pol I). The rpa2R1022C and rpa2R1022S mutants exhibited impaired cell growth under nutrient-rich conditions without affecting the Rpa2 protein levels. Furthermore, Pol I abnormally accumulated at the 5' region of rDNA in these mutants, resulting in defective 35S pre-rRNA biogenesis and increased sensitivity to the Pol I inhibitor BMH-21. These findings highlight the essential role of the Rpa2 residues associated with TCS4 in rRNA transcription and cell growth.
Insights
Treacher Collins syndrome type 4 mutations in Rpa2 impair cell growth and rRNA transcription. These findings reveal critical roles for Rpa2 in ribosome biogenesis and provide insights into craniofacial development.
Area of Science:
- Genetics
- Molecular Biology
- Developmental Biology
Background:
- Treacher Collins syndrome (TCS) is a rare congenital disorder causing craniofacial deformities.
- Mutations in ribosome biogenesis genes are linked to TCS, but underlying mechanisms are unclear.
Purpose of the Study:
- To investigate the molecular effects of Treacher Collins syndrome type 4 (TCS4)-associated mutations in the Rpa2 subunit of RNA polymerase I (Pol I).
Main Methods:
- Introduced TCS4-associated R1022C and R1022S mutations into the Rpa2 gene in Schizosaccharomyces pombe.
- Analyzed cell growth, Rpa2 protein levels, Pol I localization, and 35S pre-rRNA biogenesis in mutant strains.
- Assessed sensitivity to the Pol I inhibitor BMH-21.
Main Results:
- Rpa2 mutants (rpa2R1022C, rpa2R1022S) showed impaired cell growth under nutrient-rich conditions without altering Rpa2 protein levels.
- Abnormal accumulation of Pol I at the 5' region of rDNA was observed in mutants.
- Mutants exhibited defective 35S pre-rRNA biogenesis and increased sensitivity to BMH-21.
Conclusions:
- Rpa2 residues associated with TCS4 are essential for proper rRNA transcription and cell growth.
- These findings elucidate critical roles of Rpa2 in ribosome biogenesis relevant to TCS pathogenesis.
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