My first attempt at DNA - Results
As many of you recall, I spent yesterday trying to get DNA from some proported bigfoot samples. i invited all of you to come watch, but i was dissapointed (but not suprized) no one showed up.
As for the source of the samples: There is good news and bad news. The samples in question are thought (by the providers) to be bigfoot face prints, left on a truck window. i won't go into the complete story of the hows and whys, but they think it left a very clear face print, with discernable lips, eye cavities etc. So there is no 'I saw it push it's face on the window" moment. That is of course unfortunate, but thats what we are left to deal with it.
Once the print was discovered, i will say that it has been handled and stored correctly, following accepted forensic protocols.
So my first run was essentially to see if i could determine if it was "human" DNA - and just as an aside here. I keep seeing Melbarumblings, that this thing is human. Can someone - anyone, tell me what is her definition of "human". Because DNA does not spell out human - it can only spell words using combinations of A,T,C,and G, so it can't spell human, so i would really like a definition of how this "human" word is being defined - in a biological sense.
regardless I ran 12 samples, 4 known "human". My definition was Modern human - homo sapien, walking upright, not much hair, big brain, reduced jaw, skull riding on top of the spinal column, hip structure rolled forward, talking etc! for these samples, i used a mouth rinse technique. I also ran 3 known other mammal samples - in my case dog and horse - because thats what i had laying around. The dogs i used mouth swabs, the horse, i swabbed where the idiot had been licking my car windows, i was hoping that would mimic the face print.
I also ran 5 unknowns from the bigfoot print. 3 of those were taken within a few days of discovery of the print, and I took 2 more from the print itself.
Given the primers I was using, and the section of mDNA I was cutting out, i expected to see excellent results from the known human, with a strong band at 440 BP. I had hoped for some banding from the horse and dog samples, but did not have high expectations, given the primers I was using. and I had no idea what to expect from the faceprint samples.
So the results: I did in fact get exactly what I was expecting from my human samples. A perfect 4 for 4, clear dark bands at 440 bp. i could therefore send in those samples and have them sequenced, with the sequences containing information on each individuals heritage, what part of the world their ancestors came from.
I got nothing from either the animal or face print samples. This is what i had expected, but had hoped for more. One reason for this could be that my collection did not result in any DNA that I could amplify. This was probably the case in at least one sample, but in the others, i had a visual on the "pellet". The pellet is essentially a mass of cell debris in the bottom of the tube, that will then be isolated and from that DNA will be isolated and amplified.
Pellets from the mouth rinse technique were huge, that was expected. But I did see small pellets in 4 of the 5 face print samples, as well as in the dog samples. this is not a 100% guarantee, but is typically a good indication that you have DNA to work with.
So either the samples did not yield DNA, or in my mind, more likely they did yield DNA, but that DNA was outside the relm of the primers i was using, which were optimized for human. Given that scenario, I can comfortably declare, that if In fact i did get DNA, this thing is defintely not human! But of course that has to be qualified with "if i did get the DNA".
So whats next? Now i know we are getting good results, should I choose to continue, I will go after the same set of genes Sykes is using. The protocol will have to be a bit different, because he is using hair, and essentially I am using swabs, but if I get expected results from known humans, we will know my variations worked.
to further check my ability to isolate DNA,I will push my face up against a glass window and drool all over it, I will try to get a cow to nose up to a plate of glass, and that stupid horse will lick anything, so if i get DNA from them, I should expect that i could also get it from the unknown window prints.
The genes Sykes is using are universal in mammals and the primers have proven to be very robust across the whole range of mammals, so that should not be an issue.
So thats where I sit, trying to deside If I want to go through the expense and aggravation of one more round of testing, when I would much rather be doing samples for the barcode project!
CalWaterBear