Nucleic Acids Research, 1989, Vol. 17, No. 17 6855-6864
© 1989
MOLECULAR BIOLOGY |
Rapid detection and sequencing of alleles in the 3' flanking region of the Interleukin-6 gene
Department of Genetics, Stanford University Stanford, CA 94305 1Rockefeller University New York, NY 10021 2Cetus Corporation, Department of Human Genetics 1400 53rd Street, Emeryville, CA 94608, USA
*To whom correspondence should be addressed
Received June 28, 1989. Accepted July 27, 1989.
The 3' flanking region of the interleukin 6 gene is polymorphic due to insertions of different size. Within this region lies a sequence of approximately 500 base pairs that is AT rich. Based on flanking sequence information we have constructed oligonucleotides which prime the polymerase chain reaction (PCR) and amplify this AT rich region. The amplification products visualized by agarose gel electroplioresis gave fragment sizes for both homozygous and heterozygous individuals that were concordant with those observed by conventional genomic blotting techniques. Alleles that could not be typed by Southern analysis were resolved with this approach. These results illustrate the value of PCR for the rapid detection of length polymorphisms such as those due to variable numbers of tandem repeats. In contrast to RFLP analysis this procedure takes less than a day to perform, is cheaper, avoids the use of radioactivity and requires far less substrate DNA. Three different human alleles were sequenced, and differences were detected that were due to both large duplications and loss of one or two bases, suggesting that AT rich regions identify highly polymorphic loci. The same pruners also amplified non-human primate DNA, allowing a comparison of the human sequence with that of the common chimpanzee and baboon.
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