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Mutation analysis of the tumor suppressor gene PPP2R1B in human cervical cancer
Abstract:
Protein phosphatase 2A (PP2A) holoenzyme plays a critical role in cell cycle control and growth factor signaling. The PPP2R1B gene encodes the beta isoforms of the subunit A of the PP2A. We aimed to evaluate the role of the PPP2R1B gene in the pathogenesis of cervical cancer. Twenty-four women with primary cervical cancer were included. All resected specimens were divided into two groups: (1) cervical cancers (n = 24), (2) nearby noncancerous tissues (n = 24). We performed nested reverse transcriptase-polymerase chain reaction analysis and complementary DNA sequencing on the genomic DNA samples of all specimens. The aberrant transcripts and gene mutation as well as the genotype and allele frequencies of codon 66 CTA/CTG of PPP2R1B genes in both groups were compared. The percentages of aberrant transcripts between both groups were nonsignificantly different (20.8% vs 33.3%). There was no mutation in all specimens. The genotype and allele frequencies between both groups were non-different. Proportions of CTA homozygote/heterozygote/CTG homozygote were (1) 66.7/8.3/25% and (2) 58.3/12.5/29.2%. Proportions of CTA/CTG alleles in both groups were (1) 70.8/29.2% and (2) 64.6/35.4%. We conclude that PPP2R1B genes may not play a role in the carcinogenesis of cervical cancer. Mutations of PPP2R1B gene are not frequent in cervical cancer.
Insights
The PPP2R1B gene, crucial for cell signaling, was investigated in cervical cancer. Aberrant transcripts and mutations were analyzed, revealing no significant role for PPP2R1B in cervical cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Protein phosphatase 2A (PP2A) holoenzyme is vital for cell cycle and growth factor signaling.
- The PPP2R1B gene encodes a subunit of PP2A, potentially influencing cancer development.
Purpose of the Study:
- To investigate the role of the PPP2R1B gene in the pathogenesis of cervical cancer.
- To compare aberrant transcripts, mutations, and allele frequencies of PPP2R1B between cervical cancer tissues and adjacent noncancerous tissues.
Main Methods:
- Nested reverse transcriptase-polymerase chain reaction (RT-PCR) and complementary DNA sequencing were performed on 24 cervical cancer and 24 noncancerous tissue samples.
- Analysis focused on aberrant transcripts, gene mutations, and genotype/allele frequencies at codon 66 of the PPP2R1B gene.
Main Results:
- No significant difference in the percentage of aberrant transcripts was observed between cancer and noncancerous tissues (33.3% vs 20.8%).
- No mutations in the PPP2R1B gene were detected in any of the specimens.
- Genotype and allele frequencies of PPP2R1B at codon 66 were not significantly different between the two groups.
Conclusions:
- The PPP2R1B gene does not appear to play a significant role in the carcinogenesis of cervical cancer.
- Mutations within the PPP2R1B gene are infrequent in cervical cancer.
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