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. 1991 Sep;49(3):621–626.

Genetic mapping of the beta 1 GABA receptor gene to human chromosome 4, using a tetranucleotide repeat polymorphism.

M Dean 1, S Lucas-Derse 1, A Bolos 1, S J O'Brien 1, E F Kirkness 1, C M Fraser 1, D Goldman 1
PMCID: PMC1683131  PMID: 1652891

Abstract

As more coding loci for functional human genes are described, there is a growing need to identify DNA polymorphisms in specific genes. By examining DNA sequences within the introns of the beta 1 subunit of the gamma-aminobutyric acid receptor gene, GABARB1, we found a tetranucleotide repeat sequence (GATA). Amplification of this region by using PCR revealed seven alleles and a high degree of polymorphism (PIC = .75) in human populations. DNAs from the CEPH families were typed for the GABARB1 intron polymorphism and were analyzed with respect to 20 linked markers on chromosome 4. The results permit placement of GABARB1 on the linkage map of chromosome 4, between D4S104 and ALB. These results affirm that sequence analysis of noncoding segments included within or adjacent to functional genes has value as a strategy to detect highly informative polymorphisms.

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Selected References

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