The clinical features and course of cardiac involvement in a patient with maternally inherited diabetes and deafness associated with the mitochondrial DNA 3243 mutation are reported. A 45-year-old woman with maternally transmitted diabetes mellitus and deafness presented with congestive heart failure. The patient showed a short P-R interval on electrocardiogram (ECG) and had developed progression from left ventricular hypertrophy to a hypokinetic cardiomyopathy pattern over the course of 10 months. Rapid cardiac change was accompanied by left ventricular remodeling, as shown by wall thinning on echocardiogram and decrease in QRS voltages on ECG. Coronary arteriography revealed no significant stenosis. In the endomyocardial biopsy specimens, light microscopy showed nonspecific cardiomyopathic changes. Genetic testing for mitochondrial DNA mutations in peripheral blood lymphocytes revealed an adenine (A)-to-guanine (G) substitution at nucleotide 3243 in the mitochondrial DNA encoding the transfer RNA for leucine (tRNA Leu (UUR)). The proportion of mutant mitochondrial DNA was 25%. Two of the patient's daughters, aged 13 and 21 years, who were symptom free, were found to carry the same point mutation. A short P-R interval on ECG in the younger of them was the sole manifestation of the mutation. Unfortunately, 6 months after diagnosis, the patient died suddenly at home. Accelerated cardiomyopathy can occur as a mitochondria-related complication in patients with maternally inherited diabetes and deafness associated with the 3243 mutation.
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Front Public Health
January 2025
School of Public Health, Gansu University of Chinese Medicine, Lanzhou, China.
Objective: To investigate the role of PCBP1 in the inhibition of lung adenocarcinoma proliferation by carbon irradiation.
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Initiative on Stress, Trauma, and Resilience, Department of Psychiatry and Human Behavior, Warren Alpert Medical School, Brown University, Providence, Rhode Island.
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Department of Neurology, Center for Medical Research on Innovation and Translation, Institute of Clinical Medicine, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, China.
Abnormality in transactivating response region DNA binding protein 43 (TDP43) is well-recognized as the pathological hallmark of neurodegenerative diseases. However, the role of TDP43 in neuromyelitis optica spectrum disorder (NMOSD) remains unknown. Here, our observations demonstrate an upregulation of TDP43 in both in vitro and in vivo models of NMOSD, as well as in biological samples from NMOSD patients.
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Institute of Rare Diseases, West China Hospital of Sichuan University, Sichuan University, Chengdu, 610000, China.
Human mitochondrial DNA (mtDNA) harbors essential mutations linked to aging, neurodegenerative diseases, and complex muscle disorders. Due to its uniparental and haploid inheritance, mtDNA captures matrilineal evolutionary trajectories, playing a crucial role in population and medical genetics. However, critical questions about the genomic diversity patterns, inheritance models, and evolutionary and medical functions of mtDNA remain unresolved or underexplored, particularly in the transition from traditional genotyping to large-scale genomic analyses.
View Article and Find Full Text PDFNature
January 2025
Changping Laboratory, Beijing, The People's Republic of China.
The development of animal models is crucial for studying and treating mitochondrial diseases. Here we optimized adenine and cytosine deaminases to reduce off-target effects on the transcriptome and the mitochondrial genome, improving the accuracy and efficiency of our newly developed mitochondrial base editors (mitoBEs). Using these upgraded mitoBEs (version 2 (v2)), we targeted 70 mouse mitochondrial DNA mutations analogous to human pathogenic variants, establishing a foundation for mitochondrial disease mouse models.
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