Nucleic Acids Research, Vol 24, Issue 16 3189-3194, Copyright © 1996 by Oxford University Press
P Taberlet, S Griffin, B Goossens, S Questiau, V Manceau, N Escaravage, LP Waits and J Bouvet
Our purpose was to identify an experimental procedure using PCR that
provides a reliable genotype at a microsatellite locus using only a few
picograms of template DNA. Under these circumstances, it is possible (i)
that one allele of a heterozygous individual will not be detected and (ii)
that PCR-generated alleles or 'false alleles' will arise. A mathematical
model has been developed to account for stochastic events when pipetting
template DNA in a very dilute DNA extract and computer simulations have
been performed. Laboratory experiments were also carried out using DNA
extracted from a bear feces sample to determine if experimental results
correlate with the mathematical model. The results of 150 typing
experiments are consistent with the proposed model. Based on this model and
the level of observed false alleles, an experimental procedure using the
multiple tubes approach is proposed to obtain reliable genotypes with a
confidence level of 99%. This multiple tubes procedure should be
systematically used when genotyping nuclear loci of ancient or forensic
samples, museum specimens and hair or feces of free ranging animals.
ARTICLES
Reliable genotyping of samples with very low DNA quantities using PCR
Laboratoire de Biologie des Populations d'Altitude, CNRS UMR 5553, Universite Joseph Fourier, BP53, Grenoble, France.
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