Dietary methanol regulates human gene activity.

Methanol (MeOH) is considered to be a poison in humans because of the alcohol dehydrogenase (ADH)-mediated conversion of MeOH to formaldehyde (FA), which is toxic. Our recent genome-wide analysis of the mouse brain demonstrated that an increase in endogenous MeOH after ADH inhibition led to a significant increase in the plasma MeOH concentration and a modification of mRNA synthesis. These findings suggest endogenous MeOH involvement in homeostasis regulation by controlling mRNA levels.

Positioning of a nucleosome on mouse satellite DNA inserted into a yeast plasmid is determined by its DNA sequence and an adjacent nucleosome.

It has earlier been shown that multiple positioning of nucleosomes on mouse satellite DNA is determined by its nucleotide sequence. To clarify whether other factors, such as boundary ones, can affect the positionings, we modified the environment of satellite DNA monomer by inserting it into a yeast plasmid between inducible GalCyc promoter and a structural region of the yeast FLP gene. We have revealed that the positions of nucleosomes on satellite DNA are identical to those detected upon reconstruction in vitro.

Nucleosome positioning on yeast plasmids is determined only by the internal signal of DNA sequence occupied by the nucleosome.

The possible role of border factors in determining the nucleosome positioning on a DNA sequence was investigated. To this end a family of recombinant plasmids based on Gal10Cyc1 promoter and neomycin phosphotransferase gene NPTII were created. A DNA sequence adjoining the GalCyc promoter was varied in these plasmids.

Segment selection during 'phase variation'-type regulation of gene replacement mediated by FLP recombinase in the yeast Saccharomyces cerevisiae.

FLP recombinase has recently been used as a tool to direct the exchange between invertible DNA segments, called 'Phase variation'-type regulation of gene replacement in eukaryotic cells. Using an appropriate selective medium, positive segment selection was shown to be efficient during the regulation of gene replacement. The efficiency was determined from the copy number ratio of invertible segments with the use of the neomycinphosphotransferase II (NPTII) gene bearing invertible segments located on the episomal yeast plasmid, and the resident 2-microns circle.