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Kamfar S, Danaei B, Rahimi S, Zeinali V. Novel blood and tissue-based mitochondrial D-loop mutations detected in an Iranian NAFLD patient cohort. Mitochondrion 2024; 77:101888. [PMID: 38697590 DOI: 10.1016/j.mito.2024.101888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 04/24/2024] [Accepted: 04/28/2024] [Indexed: 05/05/2024]
Abstract
Non-alcoholic fatty liver disease (NAFLD) is an increasingly prevalent chronic liver disease characterized by an elusive etiology. In its advanced stages, this condition can pose life-threatening implications. Mitochondrial dysfunction due to its impact on hepatic lipid homeostasis, cytokine release, ROS production, and cell death, contributes to the pathogenesis of NAFLD. Previous research reveals a direct link between NAFLD genetic predictors and mitochondrial dysfunction. The emphasis on the D-loop stems from its association with impaired mtDNA replication, underscoring its crucial role in NAFLD progression. We included 38 Iranian NAFLD patients (comprising 16 patients with non-alcoholic fatty liver [NAFL] and 22 patients with non-alcoholic steatohepatitis [NASH]), with matched blood and liver tissue samples collected from each to compare variations in the mitochondrial D-loop sequence within samples. The mitochondrial DNA (mtDNA) D-loop region was amplified using PCR, and variations were identified through sequencing. The resultant sequences were compared with the reference sequence of human mtDNA available in the MITOMAP Database for comparative analysis. In this study, 97 somatic mutations in the mtDNA D-loop region were identified in NAFLD patients. Our study revealed significant difference between the NAFLD patients and control group in 13 detected mutations (P ≤ 0.05). Novel mutations were discovered in hepatic tissues, while mutation 16220-16221ins C was found in both tissues and blood. A significant difference was found in the distribution of D310 and mt514-mt523 (CA)n repeat variations between NAFLD patients and the control group (P < 0.001). C to T and T to C transitions were the prevalent substitution among patients. Identification of the 16220-16221ins C mutation in both blood and tissue samples from NAFLD patients holds substantial promise as a potential diagnostic marker. However, further research is imperative to corroborate these findings.
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Affiliation(s)
- Sharareh Kamfar
- Pediatric Congenital Hematologic Disorders Research Center, Research Institute for Children's Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Bardia Danaei
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Men's Health and Reproductive Health Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Samane Rahimi
- Department of Pediatric Emergency Medicine, School of Medicine, Mofid Children's Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Vahide Zeinali
- Research Institute for Children's Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Lei T, Rui Y, Xiaoshuang Z, Jinglan Z, Jihong Z. Mitochondria transcription and cancer. Cell Death Discov 2024; 10:168. [PMID: 38589371 PMCID: PMC11001877 DOI: 10.1038/s41420-024-01926-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 03/14/2024] [Accepted: 03/20/2024] [Indexed: 04/10/2024] Open
Abstract
Mitochondria are major organelles involved in several processes related to energy supply, metabolism, and cell proliferation. The mitochondria function is transcriptionally regulated by mitochondria DNA (mtDNA), which encodes the key proteins in the electron transport chain that is indispensable for oxidative phosphorylation (OXPHOS). Mitochondrial transcriptional abnormalities are closely related to a variety of human diseases, such as cardiovascular diseases, and diabetes. The mitochondria transcription is regulated by the mtDNA, mitochondrial RNA polymerase (POLRMT), two transcription factors (TFAM and TF2BM), one transcription elongation (TEFM), and one known transcription termination factor (mTERFs). Dysregulation of these factors directly leads to altered expression of mtDNA in tumor cells, resulting in cellular metabolic reprogramming and mitochondrial dysfunction. This dysregulation plays a role in modulating tumor progression. Therefore, understanding the role of mitochondrial transcription in cancer can have implications for cancer diagnosis, prognosis, and treatment. Targeting mitochondrial transcription or related pathways may provide potential therapeutic strategies for cancer treatment. Additionally, assessing mitochondrial transcriptional profiles or biomarkers in cancer cells or patient samples may offer diagnostic or prognostic information.
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Affiliation(s)
- Tang Lei
- Medical School, Kunming University of Science and Technology, Kunming, China
| | - Yu Rui
- Medical School, Kunming University of Science and Technology, Kunming, China
| | - Zhou Xiaoshuang
- Medical School, Kunming University of Science and Technology, Kunming, China
| | - Zhang Jinglan
- Medical School, Kunming University of Science and Technology, Kunming, China
| | - Zhang Jihong
- Medical School, Kunming University of Science and Technology, Kunming, China.
- Yunnan Province Clinical Research Center for Hematologic Disease, Kunming, China.
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Yan Z, Yuan Q, He Y, Peng F, Liu Y, Zhang H, Ji X, He X, Zhao Q, Xing J, Guo X. Mitochondrial DNA haplogroup M7: A predictor of poor prognosis for colorectal cancer patients in Chinese population. Cancer Sci 2023; 114:1056-1066. [PMID: 36382493 PMCID: PMC9986060 DOI: 10.1111/cas.15654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/04/2022] [Accepted: 11/09/2022] [Indexed: 11/17/2022] Open
Abstract
Haplogroups and single-nucleotide polymorphisms (SNP) of mitochondrial DNA (mtDNA) were associated with the prognosis of many types of cancer patients. However, whether mtDNA haplogroups contribute to clinical outcomes of colorectal cancer (CRC) in Chinese population remains to be determined. In this study, mtDNA of tissue samples from 445 CRC patients from Northwestern China was sequenced to evaluate the association between haplogroup and prognosis. The mtDNA sequencing data of 1015 CRC patients from Southern China were collected for validation. We found patients with mtDNA haplogroup M7 had a significantly higher death risk when compared with patients with other haplogroups in both Northwestern (Hazard ratio [HR] = 3.093, 95% CI = 1.768-5.411, p < 0.001) and Southern (HR = 1.607, 95% CI = 1.050-2.459, p = 0.029) China. Then, a haplogroup M7-based mtSNP classifier was selected by using LASSO Cox regression analysis. A nomogram comprising the mtSNP classifier and clinicopathological variables was developed to predict the prognosis of CRC patients (area under the curve [AUC] 0.735, 95% CI = 0.679-0.791). Furthermore, patients with high- and low-risk scores calculated by the haplogroup M7-based mtSNP classifier exhibited significantly different overall survival (OS) and recurrence-free survival (RFS) (all p < 0.001). Finally, RNA-seq and immunohistochemical analyses indicated the poor prognosis of patients with haplogroup M7 may be related to mitochondrial dysfunction and immune abnormalities in CRC tissues. In conclusion, the haplogroup M7 and haplogroup M7-based mtSNP classifier seems to be a practical and reliable prognostic predictor for CRC patients, which provides a potential tool of clinical decision-making for patients with haplogroup M7 in Chinese population.
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Affiliation(s)
- Zeyu Yan
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China.,Department of General Surgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Qing Yuan
- Institute of Medical Research, Northwestern Polytechnical University, Xi'an, China
| | - Yiwei He
- Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Key Laboratory of Targeted Intervention of Cardiovascular Disease, Key Laboratory of Cardiovascular and Cerebrovascular Medicine, Nanjing Medical University, Nanjing, China
| | - Fan Peng
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China
| | - Yang Liu
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China
| | - Huanqin Zhang
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China
| | - Xiaoying Ji
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China
| | - Xianli He
- Department of General Surgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Qi Zhao
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, Sun Yat-sen University, Guangzhou, China
| | - Jinliang Xing
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China
| | - Xu Guo
- Department of Physiology and Pathophysiology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China
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Luo Z, Fan P, Zhang S, Li Z. Single nucleotide polymorphisms in the D-loop region predicts earlyage-at-onset of malignant fibrous histiocytoma. MITOCHONDRIAL DNA PART B 2019. [DOI: 10.1080/23802359.2019.1619492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Zucheng Luo
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, P.R. China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, Zhejiang, P.R. China
- The Second School of Medicine, WenZhou Medical University, Wenzhou, Zhejiang, P.R. China
| | - Pei Fan
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, P.R. China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, Zhejiang, P.R. China
| | - Shisi Zhang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, P.R. China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, Zhejiang, P.R. China
| | - Zhenxing Li
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, P.R. China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, Zhejiang, P.R. China
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Zhou J, Gou H, Ye Y, Zhou Y, Lu X, Ying B. Sequence variations of mitochondrial DNA D-loop region in patients with acute myeloid leukemia. Oncol Lett 2017; 14:6269-6276. [PMID: 29113277 DOI: 10.3892/ol.2017.6988] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Accepted: 06/22/2017] [Indexed: 02/05/2023] Open
Abstract
The aim of the present study was to explore variations of the displacement (D)-loop region in patients with acute myeloid leukemia (AML) and their possible associations with AML pathogenesis. Blood or bone marrow samples from 216 patients with AML (158 AML patients in the first stage, and 58 more patients with AML-M3 for further verification), and 146 healthy controls were collected. Sanger sequencing was performed for the D-loop region ranging between nucleotide (nt)15811 and nt 775. With the exception of mitochondrial microsatellite instability (mtMSI) variations, a total of 2,630 variations in 232 loci were identified with similar variation rates/person in patients with AML and controls when compared with the revised Cambridge reference sequence (8.54±2.14 vs. 8.77±2.15; P=0.366). A positive association between AML and variation-T152C was identified, which occurred more frequently in patients with AML compared with in controls [26.6 vs. 17.1%; P=0.048; odds ratio (OR), 1.752; 95% confidence interval (CI), 1.004-3.058]. Furthermore, T152C was identified to be associated with promyelocytic leukemia-retinoic acid receptor α(PML-RARα) and French-American-British AML subtypes, with a tendency to occur in patients with AML-M3. The AML-M3 sample size was extended by 58 cases, and it was identified that the T152C variation rate was significantly higher in patients with AML-M3 compared with that of controls (41.0 vs. 17.1%; P<0.001; OR, 3.228; 95% CI, 1.714-6.079). However, no association was identified between the T152C variation and clinical characteristics, or chemotherapy response in patients with AML-M3. In addition, the mtMSIs, including D310, mt514-523 (CA)n and T16189C, demonstrated no association with AML risk. Together, the results of the present study suggest that the mitochondrial DNA D-loop region is high variable, and that T152C is associated with AML risk, particularly regarding the M3 subtype. T152C mayparticipate in AML pathogenesis and may be a diagnostic biomarker; however further studies with larger sample sizes are required in order to verify its value.
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Affiliation(s)
- Juan Zhou
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Haimei Gou
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yuanxin Ye
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yi Zhou
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Xiaojun Lu
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Binwu Ying
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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Zhang W, Wang W, Jia Z. Single nucleotide polymorphisms in the mitochondrial displacement loop region modifies malignant melanoma: a study in Chinese Han population. ACTA ACUST UNITED AC 2014; 26:205-7. [PMID: 24660917 DOI: 10.3109/19401736.2014.900613] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Accumulation of single nucleotide polymorphisms (SNPs) in the displacement loop (D-loop) of mitochondrial DNA (mtDNA) may be associated with an increased cancer risk. We investigated the malignant melanoma (MM) risk profile of D-loop SNPs in a case-controlled study in Chinese Han population. A statistically significant increase in SNP frequency for the T16362C, A16399G and T195C alleles was observed in MM patients (p < 0.05) comparing the MM patients to controls, which indicted that the patients who carry these alleles were susceptible to MM. The study identified SNPs in the mitochondrial D-loop could increase MM risk in Chinese Han people. The analysis of genetic polymorphisms in the mitochondrial D-loop can help identify subgroups of patients who are at a higher risk of developing MM in Chinese Han population, thereby helping to make therapeutic decisions for these patients.
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