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Multiple alternative splicing forms of human RAD17 and their differential response to ionizing radiation
M S Chen1, R Higashikubo, A Laszlo
1Section of Cancer Biology, Radiation Oncology Center, MIR, Washington University School of Medicine, 4511 Forest Park Blvd, Suite 411, Forest Park Blvd., St. Louis, MO 63018, USA. mingshun@radonc.wustl.edu
Gene
|October 17, 2001
Summary
Researchers discovered four new RAD17 RNA variants (FM1-FM4) produced by alternative splicing. These variants show differential expression across tissues, cell cycle phases, and in response to X-irradiation, suggesting distinct roles in cell regulation.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Alternative splicing is a key mechanism for generating protein diversity.
- RAD17 is involved in DNA repair and cell cycle checkpoint control.
Purpose of the Study:
- To identify and characterize alternatively spliced variants of RAD17 RNA.
- To investigate the expression patterns and potential functions of these variants.
Main Methods:
- Identification of alternatively spliced RAD17 RNAs (FM1-FM4) using molecular techniques.
- Analysis of RNA expression levels in different tissues and cell cycle phases.
- Western blot analysis to detect and quantify protein expression.
- Assessment of protein response to X-irradiation.
Main Results:
- Four alternatively spliced RAD17 RNAs (FM1, FM2, FM3, FM4) were identified, with FM3 and FM4 being novel.
- These variants exhibit tissue-specific and cell cycle-dependent expression.
- Three protein products (73, 71, and 62 kDa) corresponding to FM2, FM1, and FM4 were detected.
- The 73 and 62 kDa proteins showed a significant increase in abundance after X-irradiation.
Conclusions:
- The differential expression and response to irradiation suggest distinct functional roles for RAD17 splice variants.
- These variants may play crucial roles in cell-cycle regulation and DNA damage response pathways.