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Wang B, Song X, Zhao Q. Proportional Mean Residual Life Model With Varying Coefficients for Right Censored Data. Stat Med 2025; 44:e70008. [PMID: 39972383 DOI: 10.1002/sim.70008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 11/20/2024] [Accepted: 01/13/2025] [Indexed: 02/21/2025]
Abstract
The mean residual life provides the remaining life expectancy of a subject who has survived to a specific time point. This paper considers a proportional mean residual life model with varying coefficients, which allows one to explore the nonlinear interactions between some covariates and an exposure variable. In a semiparametric setting, we construct local estimating equations to obtain the varying coefficients and establish the asymptotic normality of the proposed estimators. Moreover, the weak convergence property for the local estimator of the baseline mean residual life function is developed. We conduct simulation studies to empirically examine the finite-sample performance of the proposed methods and apply the methodology to a real-life dataset on type 2 diabetic complications.
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Affiliation(s)
- Bing Wang
- School of Big Data and Statistics, Anhui University, Anhui, China
| | - Xinyuan Song
- Department of Statistics, Chinese University of Hong Kong, Hong Kong, China
| | - Qian Zhao
- School of Statistics and Information, Shanghai University of International Business and Economics, Shanghai, China
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Xu X, Liang F, Chen J, Chen F, Kong L, Ding Y. Association of FHL5 and LPA genetic polymorphisms with diabetes mellitus risk: a case-control study. Aging Male 2023; 26:2235005. [PMID: 37452735 DOI: 10.1080/13685538.2023.2235005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 07/03/2023] [Accepted: 07/05/2023] [Indexed: 07/18/2023] Open
Abstract
BACKGROUND China is one of the countries with the fastest growing prevalence of diabetes mellitus (DM) in the world. This study intended to investigate the association of single nucleotide polymorphisms (SNPs) of FHL5 and LPA with DM risk in the Chinese population. METHODS This case-control study involved 1,420 Chinese individuals (710 DM patients and 710 controls). Four candidate loci (rs2252816/rs9373985 in FHL5 and rs3124784/rs7765781 in LPA) were successfully screened. The association of SNPs with DM risk was assessed by logistic regression analysis. Differences in clinical characteristics among subjects with different genotypes were analyzed by one-way analysis of variance. RESULTS Overall analysis indicated that rs3124784 was associated with an increased risk of DM. Stratification analysis showed that rs3124784 significantly increased DM risk in different subgroups (male, non-smoking, non-drinking, and BMI > 24), while rs7765781 increased DM risk only in participants with BMI ≤ 24. Rs2252816 was associated with the course of DM. We also found that rs2252816 GG genotype and rs9373985 GG genotype were linked to the increased cystatin c in DM patients. CONCLUSION The genetic polymorphisms of LPA may be associated with DM risk in the Chinese population, which will provide useful information for the prevention and diagnosis of DM.
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Affiliation(s)
- Xuezhong Xu
- Department of Endocrinology, People's Hospital of Wanning, Wanning, Hainan, China
| | - Fangyun Liang
- Department of Endocrinology, People's Hospital of Wanning, Wanning, Hainan, China
| | - Jinmei Chen
- Department of Endocrinology, People's Hospital of Wanning, Wanning, Hainan, China
| | - Feihong Chen
- Department of Endocrinology, People's Hospital of Wanning, Wanning, Hainan, China
| | - Lingyi Kong
- Department of Endocrinology, People's Hospital of Wanning, Wanning, Hainan, China
| | - Yipeng Ding
- Department of Pulmonary and Critical Care Medicine, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou, Hainan, China
- Department of General Practice, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou, Hainan, China
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Gunavathy N, Balaji R, Kumaravel V. Association of TCF7L2 Variants in Type 2 Diabetes Mellitus with Hypertriglyceridemia - A Case-Control Study. Indian J Endocrinol Metab 2023; 27:346-350. [PMID: 37867984 PMCID: PMC10586556 DOI: 10.4103/ijem.ijem_35_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/03/2023] [Accepted: 05/21/2023] [Indexed: 10/24/2023] Open
Abstract
Background Type 2 Diabetes Mellitus (T2DM) is a chronic metabolic condition involving various genetic and environmental factors leading to impaired insulin secretion, resulting in hyperglycemia. The transcription factor 7-like 2 (TCF7L2) gene is an element of the Wnt signaling pathway that plays an important role in glucose and lipid metabolism. The aim of this study is to evaluate the association of TCF7L2 rs7903146 and rs12255372 polymorphisms in T2DM with hypertriglyceridemia. Methods We investigated the effect of rs7903146 and rs12255372 on T2DM with high triglyceride (TG) levels in 60 patients and 20 controls. The anthropometric measurements and biochemical tests were assessed. Peripheral blood samples were collected, and genomic DNA was extracted. The genotyping of TCF7L2 polymorphisms was carried out using polymerase chain reaction (PCR)-based direct sequencing and allele-specific PCR methods. The T2DM patients and controls were compared by means of the t-test, Chi-square test, odds ratio (OR), and 95% confidence interval (CI) using Epi Info v7. Results The HbA1c was found to be 9.7 ± 2.1 and 5.4 ± 0.5% in patients and controls, respectively. The average TG levels (P < 0.005) in patients were 205.2 ± 145.7 and 106.4 ± 27.4mg/dl in controls. Significant evidence of association was found in T2DM patients having high TG levels with rs7903146 CT/TT (OR: 4.89; P = 0.0105) and rs12255372 GT/TT (OR: 5.23; P = 0.0101) genotypes when compared to controls. Conclusion The results of this study show that TCF7L2 rs7903146 CT/TT and rs12255372 GT/TT genotypes are significantly associated with the risk of hypertriglyceridemia in individuals with T2DM among the studied population.
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Affiliation(s)
- Nagarajan Gunavathy
- Department of Molecular Genetics, Alpha Health Foundation, Madurai, Tamil Nadu, India
| | - Ramanathan Balaji
- Department of Molecular Genetics, Alpha Health Foundation, Madurai, Tamil Nadu, India
| | - Velayutham Kumaravel
- Department of Molecular Genetics, Alpha Health Foundation, Madurai, Tamil Nadu, India
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Azarova I, Polonikov A, Klyosova E. Molecular Genetics of Abnormal Redox Homeostasis in Type 2 Diabetes Mellitus. Int J Mol Sci 2023; 24:4738. [PMID: 36902173 PMCID: PMC10003739 DOI: 10.3390/ijms24054738] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 02/20/2023] [Accepted: 02/24/2023] [Indexed: 03/05/2023] Open
Abstract
Numerous studies have shown that oxidative stress resulting from an imbalance between the production of free radicals and their neutralization by antioxidant enzymes is one of the major pathological disorders underlying the development and progression of type 2 diabetes (T2D). The present review summarizes the current state of the art advances in understanding the role of abnormal redox homeostasis in the molecular mechanisms of T2D and provides comprehensive information on the characteristics and biological functions of antioxidant and oxidative enzymes, as well as discusses genetic studies conducted so far in order to investigate the contribution of polymorphisms in genes encoding redox state-regulating enzymes to the disease pathogenesis.
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Affiliation(s)
- Iuliia Azarova
- Department of Biological Chemistry, Kursk State Medical University, 3 Karl Marx Street, 305041 Kursk, Russia
- Laboratory of Biochemical Genetics and Metabolomics, Research Institute for Genetic and Molecular Epidemiology, Kursk State Medical University, 18 Yamskaya Street, 305041 Kursk, Russia
| | - Alexey Polonikov
- Laboratory of Statistical Genetics and Bioinformatics, Research Institute for Genetic and Molecular Epidemiology, Kursk State Medical University, 18 Yamskaya Street, 305041 Kursk, Russia
- Department of Biology, Medical Genetics and Ecology, Kursk State Medical University, 3 Karl Marx Street, 305041 Kursk, Russia
| | - Elena Klyosova
- Laboratory of Biochemical Genetics and Metabolomics, Research Institute for Genetic and Molecular Epidemiology, Kursk State Medical University, 18 Yamskaya Street, 305041 Kursk, Russia
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Wang MM, Lu CF, Yan SQ, Wang BZ, Yesitayi G, Tian YL, Xiang-Ma, Ma YT. Association of genetic polymorphisms of PCSK9 with type 2 diabetes in Uygur Chinese population. BMC Cardiovasc Disord 2022; 22:284. [PMID: 35733117 PMCID: PMC9219175 DOI: 10.1186/s12872-022-02710-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 06/02/2022] [Indexed: 11/17/2022] Open
Abstract
Background PCSK9 gene expression is associated with biological processes such as lipid metabolism, glucose metabolism, and inflammation. In the present study, our primary objective was to assess the association between the single-nucleotide polymorphisms in the PCSK9 gene and type 2 diabetes in Uygur subjects, in Xinjiang, China. Methods We designed a case–control study including 662 patients diagnosed with T2DM and 1220 control subjects. Four single-nucleotide polymorphisms (rs11583680, rs2483205, rs2495477 and rs562556) of PCSK9 gene were genotyped using the improved multiplex ligation detection reaction technique. Results For rs2483205, the distribution of genotypes, dominant model (CC vs CT + TT), overdominant model (CC + TT vs CT) showed significant differences between T2DM patients and the controls (P = 0.011 and P = 0.041 respectively). For rs2495477, the distribution of genotypes, the dominant model (AA vs GA + GG) showed significant differences between T2DM patients and the controls (P = 0.024). Logistic regression analysis suggested after adjustment of other confounders, the differences remained significant between the two groups [for rs2483205 CC vs CT + TT: odds ratio (OR) = 1.321, 95% confidence interval (CI) 1.078–1.617, P = 0.007; CC + TT vs CT: OR = 1.255, 95% CI 1.021–1.542, P = 0.03; for rs2495477 AA vs GA + GG: OR = 1.297, 95% CI 1.060–1.588, P = 0.012]. Conclusion The present study indicated that CT + TT genotype and CT genotype of rs2483205, as well as GA + GG genotype of rs2495477 in PCSK9 gene were associated with an increased risk of type 2 diabetes in the Uygur population in Xinjiang. Supplementary Information The online version contains supplementary material available at 10.1186/s12872-022-02710-w.
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Affiliation(s)
- Meng-Meng Wang
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China
| | - Chen-Fei Lu
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China
| | - Shi-Qi Yan
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China
| | - Bao-Zhu Wang
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China
| | - Gulinazi Yesitayi
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China
| | - Yong-Liang Tian
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China
| | - Xiang-Ma
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China.
| | - Yi-Tong Ma
- Department of Cardiology, First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830011, People's Republic of China.
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Molecular Mechanism of Pancreatic β-Cell Failure in Type 2 Diabetes Mellitus. Biomedicines 2022; 10:biomedicines10040818. [PMID: 35453568 PMCID: PMC9030375 DOI: 10.3390/biomedicines10040818] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 03/27/2022] [Accepted: 03/29/2022] [Indexed: 02/08/2023] Open
Abstract
Various important transcription factors in the pancreas are involved in the process of pancreas development, the differentiation of endocrine progenitor cells into mature insulin-producing pancreatic β-cells and the preservation of mature β-cell function. However, when β-cells are continuously exposed to a high glucose concentration for a long period of time, the expression levels of several insulin gene transcription factors are substantially suppressed, which finally leads to pancreatic β-cell failure found in type 2 diabetes mellitus. Here we show the possible underlying pathway for β-cell failure. It is likely that reduced expression levels of MafA and PDX-1 and/or incretin receptor in β-cells are closely associated with β-cell failure in type 2 diabetes mellitus. Additionally, since incretin receptor expression is reduced in the advanced stage of diabetes mellitus, incretin-based medicines show more favorable effects against β-cell failure, especially in the early stage of diabetes mellitus compared to the advanced stage. On the other hand, many subjects have recently suffered from life-threatening coronavirus infection, and coronavirus infection has brought about a new and persistent pandemic. Additionally, the spread of coronavirus infection has led to various limitations on the activities of daily life and has restricted economic development worldwide. It has been reported recently that SARS-CoV-2 directly infects β-cells through neuropilin-1, leading to apoptotic β-cell death and a reduction in insulin secretion. In this review article, we feature a possible molecular mechanism for pancreatic β-cell failure, which is often observed in type 2 diabetes mellitus. Finally, we are hopeful that coronavirus infection will decline and normal daily life will soon resume all over the world.
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Ottaiano A, Circelli L, Santorsola M, Savarese G, Fontanella D, Gigantino V, Di Mauro A, Capuozzo M, Zappavigna S, Lombardi A, Perri F, Cascella M, Granata V, Capuozzo M, Nasti G, Caraglia M. Metastatic colorectal cancer and type 2 diabetes: prognostic and genetic interactions. Mol Oncol 2022; 16:319-332. [PMID: 34668636 PMCID: PMC8763648 DOI: 10.1002/1878-0261.13122] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/04/2021] [Accepted: 10/19/2021] [Indexed: 12/13/2022] Open
Abstract
The present study was undertaken to analyze prognostic and genetic interactions between type 2 diabetes and metastatic colorectal cancer. Patients' survival was depicted through the Kaplan-Meier product limit method. Prognostic factors were examined through the Cox proportional-hazards regression model, and associations between diabetes and clinical-pathologic variables were evaluated by the χ2 test. In total, 203 metastatic colorectal cancer patients were enrolled. Lymph nodes (P = 0.0004) and distant organs (> 2 distant sites, P = 0.0451) were more frequently involved in diabetic patients compared with those without diabetes. Diabetes had an independent statistically significant negative prognostic value for survival. Highly selected patients with cancer and/or diabetes as their only illness(es) were divided into three groups: (a) seven oligo-metastatic patients without diabetes, (b) 10 poly-metastatic patients without diabetes, and (c) 12 poly-metastatic diabetic patients. These groups of patients were genetically characterized through the Illumina NovaSeq 6000 (San Diego, CA, USA) platform and TruSigt™Oncology 500 kit, focusing on genes involved in diabetes and colorectal cancer. Gene variants associated with diabetes and cancer were more frequent in patients in group 3. We found that type 2 diabetes is a negative prognostic factor for survival in colorectal cancer. Diabetes-associated gene variants could concur with malignancy, providing a rational basis for innovative models of tumor progression and therapy.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Silvia Zappavigna
- Department of Precision MedicineUniversity “L. Vanvitelli” of NaplesItaly
- Cytometric and Mutational DiagnosticsAzienda Universitaria Policlinico “L. Vanvitelli,”NaplesItaly
| | - Angela Lombardi
- Department of Precision MedicineUniversity “L. Vanvitelli” of NaplesItaly
- Cytometric and Mutational DiagnosticsAzienda Universitaria Policlinico “L. Vanvitelli,”NaplesItaly
| | - Francesco Perri
- Istituto Nazionale Tumori di Napoli, IRCCS “G. Pascale,”NaplesItaly
| | - Marco Cascella
- Istituto Nazionale Tumori di Napoli, IRCCS “G. Pascale,”NaplesItaly
| | - Vincenza Granata
- Istituto Nazionale Tumori di Napoli, IRCCS “G. Pascale,”NaplesItaly
| | | | - Guglielmo Nasti
- Istituto Nazionale Tumori di Napoli, IRCCS “G. Pascale,”NaplesItaly
| | - Michele Caraglia
- Department of Precision MedicineUniversity “L. Vanvitelli” of NaplesItaly
- Cytometric and Mutational DiagnosticsAzienda Universitaria Policlinico “L. Vanvitelli,”NaplesItaly
- Laboratory of Precision and Molecular OncologyBiogem ScarlInstitute of Genetic ResearchAriano IrpinoItaly
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