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The quinic acid (qa) gene cluster of Neurospora crassa is subject to two levels of gene control: a primary system which responds to the presence of quinic acid via the qa-1S repressor protein, and a secondary system which represses transcription of qa genes in the presence of a preferred carbon source, e.g. glucose. RNA blot analysis revealed that transcription of the qa-y gene, which encodes a quinic...
Microscopic aspects, densitometric evaluation of Feulgen-stained DNA, and gel electrophoresis of total DNA have been used to elucidate the effects of 1, 2, and 3h VC (ascorbic acid), VK 3 (menadione), and combined VC:VK 3 treatments on the cellular and nuclear morphology and DNA content of a human ovarian carcinoma cell line (MDAH 2774). Optical densitometry showed a significant decrease...
Analysis of mammalian mtDNA by two-dimensional agarose gel electrophoresis revealed two classes of replication intermediate. One was resistant to single-strand nuclease digestion and displayed the mobility properties of coupled leading- and lagging- strand replication products. Intermediates of coupled, unidirectional mtDNA replication were found in mouse liver and human placenta and were the predominant...
In S. cerevisiae, mitochondrial DNA (mtDNA) molecules, in spite of their high copy number, segregate as if there were a small number of heritable units. The rapid segregation of mitochondrial genomes can be analyzed using mtDNA deletion variants. These small, amplified genomes segregate preferentially from mixed zygotes relative to wild-type mtDNA. This segregation advantage is abolished by mutations...
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