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The CHEK2 I157T Variant and Colorectal Cancer Susceptibility: A Systematic Review and Meta-analysis
Liu, Chuan,Wang, Qing-Shui,Wang, Ya-Jie Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Background: The cell cycle checkpoint kinase 2 (CHEK2) gene I157T variant may be associated with an increased risk of colorectal cancer, but it is unclear whether the evidence is sufficient to recommend testing for the mutation in clinical practice. Materials and Methods: We systematically searched PubMed, EMBASES, Elsevier and Springer for relevant articles before Apr 2012. Summary odds ratios (ORs) and 95% confidence intervals (95% CIs) were calculated using a fixed-effects or random-effects models with Review Manager 5.0 software. Results: A total of seven studies including 4,029 cases and 13,844 controls based on the search criteria were included for analysis. A significant association of the CHEK2 I157T C variant with unselected CRC was found (OR = 1.61, 95% CI = 1.40-1.87, P < 0.001). We also found a significant association with sporadic CRC (OR = 1.48, 95% CI = 1.23-1.77, P < 0.001) and separately with familial CRC (OR = 1.97, 95% CI = 1.41-2.74, P < 0.001). Conclusion: This meta-analysis demonstrates that the CHEK2 I157T variant may be another important CRC-predisposing gene, which increases CRC risk, especially in familial CRC.
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The CHEK2 I157T Variant and Breast Cancer Susceptibility: A Systematic Review and Meta-analysis
Liu, Chuan,Wang, Ying,Wang, Qing-Shui,Wang, Ya-Jie Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4
Background: The cell cycle checkpoint kinase 2 (CHEK2) gene I157T variant may be associated with an increased risk of breast cancer, but it is unclear whether the evidence is sufficient to recommend testing for the mutation in clinical practice. Materials and Methods: We systematically searched PubMed, Embase, Elsevier and Springer for relevant articles published before Nov 2011. Summary odds ratio (OR) and 95% confidence interval (95% CI) incidence rates were calculated using a random-effects model with STATA (version 10.0) software. Results: A total of fifteen case-control studies, including 19,621 cases and 27,001 controls based on the search criteria, were included for analysis. A significant association was found between carrying the CHEK2 I157T variant and increased risk of unselected breast cancer (OR = 1.48, 95% CI = 1.31-1.66, P < 0.0001), familial breast cancer (OR = 1.48, 95% CI = 1.16-1.89, P < 0.0001), and early-onset breast cancer (OR = 1.47, 95% CI = 1.29-1.66, P < 0.0001). We found an even stronger significant association between the CHEK2 I157T C variant and increased risk of lobular type breast tumors (OR = 4.17, 95% CI = 2.89-6.03, P < 0.0001). Conclusion: Our research indicates that the CHEK2 I157T variant may be another important genetic mutation which increases risk of breast cancer, especially the lobular type.
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Hui-hui Xie,Lin Chen,Fa-qing Xu,Wan-sheng Guo,Shui Wang,Zhong-Nan Yang,Sen Zhang 한국식물학회 2017 Journal of Plant Biology Vol.60 No.4
Pollen exine, mainly composed of sporopollenin,plays important roles during microspore development. It hasbeen reported that Acyl-CoA Synthetase5 (ACOS5) is requiredfor sporopollenin biosynthesis in Arabidopsis. Here we showthat ACOS5 is essential for primexine formation duringArabidopsis microspore development. Through genetic screen,we identified a point mutation of ACOS5 allele, acos5-2,showing abnormal microspore development. Its microsporeswere degenerated and aborted after released from the tetrads. Transmission electron microscopy showed that primexineformation was reduced in acos5-2 mutant as compared tothat of the wild-type. Consequently, sporopollenin wasaggregated and randomly deposited on the microspores. Insitu hybridization indicated that the key regulators of tapetumdevelopment, DYT1 and TDF1, are required for the expressionof ACOS5 in tapetum. Furthermore, the GUS reporter showedthat the 593-bp promoter sequence was sufficient for theexpression of ACOS5 in the anther. Our data provide evidencethat ACOS5 is required for primexine formation andsporopollenin deposition during microspore development.
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Xing-Chun Wu,Chang-Xun Fang,Jin-Yang Chen,Qing-Shui Wang,Ting Chen,Wen-Xiong Lin,Zhong-Liang Huang 한국식물학회 2011 Journal of Plant Biology Vol.54 No.4
To determine the proteomic response to UV irradiation, two cultivars, i.e., Lemont (UV tolerant) and Dular (UV sensitive), were exposed to natural and enhanced ultraviolet-B (UV-B) irradiation for 1, 7, and 14 days, and two-dimensional gel electrophoresis in combination with mass spectrometry (MS) and bioinformatics were used to compare the different proteomic responses in the leaves of the two cultivars. Thirty-nine proteins were up- or downregulated following the UV-B treatments. Among them, 30 increased or decreased more than 1.5-fold in abundance. They were further tested by using matrix-assisted laser desorption/ionization time of flight MS and performed a database search. Twentyfour proteins were thus identified. These identified proteins were mostly upregulated in Lemont, whereas only 14 of them upregulated in Dular. Nine proteins involved in glycometabolism and fatty acid metabolisms, signal transduction, and protein synthesis and folding in Dular were not changed. These results suggest that there was a complex regulative mechanism on the proteomes in rice leaves upon UV-B exposure.
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