Article ; Online: Negative correlation between organ heteroplasmy, particularly hepatic heteroplasmy, and age at death revealed by post-mortem studies of m.3243A > G cases.
Molecular genetics and metabolism
2023 Volume 140, Issue 3, Page(s) 107691
Abstract: Mitochondrial DNA m.3243A > G mutation causes mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) and its associated multi-organ disorders, including diabetes. To clarify associations between m.3243A > G organ heteroplasmy and ...
| Abstract | Mitochondrial DNA m.3243A > G mutation causes mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) and its associated multi-organ disorders, including diabetes. To clarify associations between m.3243A > G organ heteroplasmy and clinical phenotypes, including the age at death, we combined genetic and pathological examinations from seven unreported and 36 literature cases of autopsied subjects. Clinical characteristics of subjects were as follows: male, 13; female, 28; unknown, 2; the age at death, 36.9 ± 20.2 [4-82] years; BMI, 16.0 ± 2.9 [13.0-22.3]; diabetes, N = 21 (49%), diabetes onset age 38.6 ± 14.2 years; deafness, N = 27 (63%); stroke-like episodes (StLEp), N = 25 (58%); congestive heart failure (CHF), N = 15 (35%); CHF onset age, 51.3 ± 14.5 years. Causes of death (N = 32) were as follows: cardiac, N = 13 (41%); infection, N = 8 (25%); StLEp, N = 4 (13%); gastrointestinal, N = 4 (13%); renal, N = 2 (6%); hepatic, N = 1 (2%). High and low heteroplasmies were confirmed in non-regenerative and regenerative organs, respectively. Heteroplasmy of the liver, spleen, leukocytes, and kidney for all subjects was significantly associated with the age at death. Furthermore, the age at death was related to juvenile-onset (any m.3243A > G-related symptoms appeared before 20) and stroke-like episodes. Multiple linear regression analysis with the age at death as an objective variable showed the significant contribution of liver heteroplasty and juvenile-onset to the age at death. m.3243A > G organ heteroplasmy levels, particularly hepatic heteroplasmy, are significantly associated with the age at death in deceased cases. |
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| MeSH term(s) | Humans ; Male ; Female ; Adult ; Middle Aged ; Aged ; Child, Preschool ; Child ; Adolescent ; Young Adult ; Aged, 80 and over ; Heteroplasmy ; DNA, Mitochondrial/genetics ; Mutation ; Diabetes Mellitus ; Stroke/complications ; Liver/pathology ; MELAS Syndrome/genetics |
| Chemical Substances | DNA, Mitochondrial |
| Language | English |
| Publishing date | 2023-08-28 |
| Publishing country | United States |
| Document type | Journal Article ; Research Support, Non-U.S. Gov't |
| ZDB-ID | 1418518-0 |
| ISSN | 1096-7206 ; 1096-7192 |
| ISSN (online) | 1096-7206 |
| ISSN | 1096-7192 |
| DOI | 10.1016/j.ymgme.2023.107691 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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