نتایج جستجو برای: ndna
تعداد نتایج: 329 فیلتر نتایج به سال:
Mitochondrial oxidative phosphorylation (OXPHOS) sustains organelle function and plays a central role in cellular energy metabolism. The OXPHOS system consists of 5 multisubunit complexes (CI-CV) that are built up of 92 different structural proteins encoded by the nuclear (nDNA) and mitochondrial DNA (mtDNA). Biogenesis of a functional OXPHOS system further requires the assistance of nDNA-encod...
BACKGROUND Diabetes mellitus (DM) is increasing in men of reproductive age. Despite this, the prevalence of diabetes in men attending fertility clinics is largely unknown. Furthermore, studies examining the effects of DM on sperm fertility potential have been limited to conventional semen analysis. METHODS Conventional semen analysis (semen volume, sperm count, motility and morphology) was pe...
BACKGROUND Although human immunodeficiency virus (HIV) infection and antiretroviral therapy (ART) affect mitochondrial DNA (mtDNA) content and function, comprehensive evaluations of their effects on mitochondria in muscle, adipose tissue, and blood cells are limited. METHODS Mitochondrial DNA quantification, mitochondrial genome sequencing, and gene expression analysis were performed on muscl...
The human mitochondrial genome (mtDNA) encodes 22 tRNAs (mt-tRNAs) that are necessary for the intraorganellar translation of the 13 mtDNA-encoded subunits of the mitochondrial respiratory chain complexes. Maturation of mt-tRNAs involves 5' and 3' nucleolytic excision from precursor RNAs, as well as extensive post-transcriptional modifications. Recent data suggest that over 7% of all mt-tRNA res...
The effect of caloric restriction (CR) (40%) on the rates of mitochondrial H2O2 production and oxygen consumption and oxidative damage to nuclear DNA (nDNA) and mitochondrial DNA (mtDNA) was studied for short-term (6-wk) and long-term (1-year) periods in the heart of young and old rats. Short-term CR did not change any of the parameters measured. However, long-term CR significantly decreased th...
The lion Panthera leo is one of the world's most charismatic carnivores and is one of Africa's key predators. Here, we used a large dataset from 357 lions comprehending 1.13 megabases of sequence data and genotypes from 22 microsatellite loci to characterize its recent evolutionary history. Patterns of molecular genetic variation in multiple maternal (mtDNA), paternal (Y-chromosome), and bipare...
Eukaryotic cells carry two genomes, nuclear (nDNA) and mitochondrial (mtDNA), which are ostensibly decoupled in their replication, segregation and inheritance. It is increasingly appreciated that heteroplasmy, the occurrence of multiple mtDNA haplotypes in a cell, plays an important biological role, but its features are not well understood. Accurately determining the diversity of mtDNA has been...
The clinical and immunological manifestations of 51 children with onset of systemic lupus erythematosus (SLE) before the age of 15 were compared with those of 308 adult patients with disease onset between the age of 15-49 and another 27 elderly lupus patients whose disease onset occurred at or after the age of 50. Overall disease activity determined by mean SLEDAI score was highest in the child...
A classical taxonomic revision of the genus Grimmia (Bryophyta) is currently in its final stage. According to Muñoz & Pando (2000) the genus comprise 73 species plus several described afterwards (Muñoz & al. 2002; Muñoz, 2002; Greven, 2003). A preliminary cladistic analysis using morphological characters render the following infrageneric groups: subg. Grimmia; subg. Orthogrimmia, including sect...
Mitochondrial DNA (mtDNA) deletions are associated with various mitochondrial disorders. The deletions identified in humans are flanked by short, directly repeated mitochondrial DNA sequences; however, the mechanism of such DNA rearrangements has yet to be elucidated. In contrast to nuclear DNA (nDNA), mtDNA is more exposed to oxidative damage, which may result in double-strand breaks (DSBs). A...
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