Effect of cellular physiology on PCR amplification efficiency
作者:
M. C. Silva,
C. A. Batt,
期刊:
Molecular Ecology
(WILEY Available online 1995)
卷期:
Volume 4,
issue 1
页码: 11-16
ISSN:0962-1083
年代: 1995
DOI:10.1111/j.1365-294X.1995.tb00187.x
出版商: Blackwell Publishing Ltd
关键词: coamplification bias;DNA extraction;mahR;polymerase chain reaction (PCR);Pseudomonas putida;reliability
数据来源: WILEY
摘要:
AbstractCulture conditions, and other variables that modulate a cell's physiology, can bias a polymerase chain reaction (PCR) amplification against generating a representative population profile. TwoPseudomonas putida nahRalleles were constructed in pUC19 that differ solely in a 31‐bp internal segment whose sequence has been inverted. After PCR amplification, the products could be distinguished on the basis of a change in a unique restriction site. When anEscherichia colistrain carrying onenahRallele is submitted to different growth conditions, the consequences of such variations on the relative PCR amplification of whole cells can be ascertained through coamplification with a strain carrying the other allele and subsequent restriction analysis. Cells in stationary phase displayed improved amplifiability while cells grown at 42°C were equally amplifiable as compared to cells grown at 37°C. However, sublethal levels of tetracycline or growth in minimal medium made the PCR target in these cells relatively less amplifiable. When cells are completely lysed and the plasmid DNA is purified beforehand, the coamplification bias is eliminated. These results suggest that mixed populations containing cells in different physiological states may not be representatively amplified by PCR unless a DNA extraction step is inclu
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