In a general model, DSBs are cut on both strands to create large gaps flanked by rather short regions of single-stranded DNA that could invade a homologous template and initiate DNA repair[ 17].
In addition, this method does not require bisulfite conversion of DNA and therefore avoids biases in amplification of bisulfite-converted DNA that could dramatically affect results for samples that usually contain a mixture of methylated and unmethylated sequences [ 109].
However, if the SAGE library was contaminated after the initial RNA sample was divided, there are three possible sources of contaminating DNA that could explain our results (i.e. that generated matches to the human genome): human genomic DNA, DNA from other human transcripts or ditags from previously generated human SAGE libraries.
True, Celera did use its privileged position to hunt for sections of DNA that could be patented for medical applications.
Scientists collected hairs snagged by strategically placed barbed wire to extract DNA that could identify how many bears had passed by, their gender and unique identity.
Now, epigeneticists are asking whether in fact our environment, from smoking and diet to pollution and war, can leave "epigenetic marks" on our DNA that could get passed on to subsequent generations.
A spokeswoman for the Paris prosecutors said the medical equipment was being analyzed "to determine whether we can find illegal substances and DNA that could possibly link it to riders," the A.P. reported.
The authorities will have even less of a chance of catching athletes who move beyond drugs and hormones to "gene doping" — inserting genes in their DNA that could increase strength and endurance without leaving telltale chemicals in the bloodstream.
Semen is a special case, requiring the separation of the DNA found in sperm from other DNA that could have come from either the suspect or the victim.
Biology would not accept the gene as real until it was shown to have a physical structure — DNA — that could do the work geneticists assigned to the gene.
It was a stretch of DNA that could be transcribed by an enzyme called polymerase into a chemically similar molecule known as RNA.
