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. 1991 Feb;48(2):223–226.

A dimorphic 4-bp repeat in the cystic fibrosis gene is in absolute linkage disequilibrium with the delta F508 mutation: implications for prenatal diagnosis and mutation origin.

F F Chehab 1, J Johnson 1, E Louie 1, M Goossens 1, E Kawasaki 1, H Erlich 1
PMCID: PMC1683013  PMID: 1990833

Abstract

The gene causing cystic fibrosis (CF) has been recently cloned, and the major mutation (delta F508) accounting for approximately 70% of CF chromosomes has been uncovered. We have identified at the 3' end of intron 6 in the CF gene a 4-bp tandem repeat (GATT) that exhibits interesting features. First, PCR screening of 103 normal individuals revealed that the repeat exists only in two polymorphic allelic forms, either as a hexamer or a heptamer. These two alleles are in Hardy-Weinberg equilibrium and predict a heterozygote frequency of 41% (p[seven repeats] = .71; q [six repeats] = .29). Second, the allele with six repeats was found linked to delta F508 on all 76 CF chromosomes investigated, demonstrating strong linkage disequilibrium and suggesting that delta F508 had originated on the gene bearing six repeats. Third, when the repeat alleles are linked to the DNA markers XV2c and KM19, extended haplotypes are generated. These new haplotypes become informative in situations in which prenatal diagnosis cannot be performed solely with XV2c and KM19. Since this repeat marker is located in the CF gene and would be very less likely to recombine with the gene, it can serve as a valuable DNA marker for haplotype analysis. A possible crossover, however, was identified between XV2c and KM19, transferring delta F508 to a different haplotype.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Chehab F. F., Kan Y. W. Detection of specific DNA sequences by fluorescence amplification: a color complementation assay. Proc Natl Acad Sci U S A. 1989 Dec;86(23):9178–9182. doi: 10.1073/pnas.86.23.9178. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Cutting G. R., Kasch L. M., Rosenstein B. J., Zielenski J., Tsui L. C., Antonarakis S. E., Kazazian H. H., Jr A cluster of cystic fibrosis mutations in the first nucleotide-binding fold of the cystic fibrosis conductance regulator protein. Nature. 1990 Jul 26;346(6282):366–369. doi: 10.1038/346366a0. [DOI] [PubMed] [Google Scholar]
  3. Dean M., White M. B., Amos J., Gerrard B., Stewart C., Khaw K. T., Leppert M. Multiple mutations in highly conserved residues are found in mildly affected cystic fibrosis patients. Cell. 1990 Jun 1;61(5):863–870. doi: 10.1016/0092-8674(90)90196-l. [DOI] [PubMed] [Google Scholar]
  4. Estivill X., Scambler P. J., Wainwright B. J., Hawley K., Frederick P., Schwartz M., Baiget M., Kere J., Williamson R., Farrall M. Patterns of polymorphism and linkage disequilibrium for cystic fibrosis. Genomics. 1987 Nov;1(3):257–263. doi: 10.1016/0888-7543(87)90052-8. [DOI] [PubMed] [Google Scholar]
  5. Feldman G. L., Williamson R., Beaudet A. L., O'Brien W. E. Prenatal diagnosis of cystic fibrosis by DNA amplification for detection of KM-19 polymorphism. Lancet. 1988 Jul 9;2(8602):102–102. doi: 10.1016/s0140-6736(88)90030-x. [DOI] [PubMed] [Google Scholar]
  6. Keller E. B., Noon W. A. Intron splicing: a conserved internal signal in introns of animal pre-mRNAs. Proc Natl Acad Sci U S A. 1984 Dec;81(23):7417–7420. doi: 10.1073/pnas.81.23.7417. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Kerem B., Rommens J. M., Buchanan J. A., Markiewicz D., Cox T. K., Chakravarti A., Buchwald M., Tsui L. C. Identification of the cystic fibrosis gene: genetic analysis. Science. 1989 Sep 8;245(4922):1073–1080. doi: 10.1126/science.2570460. [DOI] [PubMed] [Google Scholar]
  8. Kunkel L. M., Smith K. D., Boyer S. H., Borgaonkar D. S., Wachtel S. S., Miller O. J., Breg W. R., Jones H. W., Jr, Rary J. M. Analysis of human Y-chromosome-specific reiterated DNA in chromosome variants. Proc Natl Acad Sci U S A. 1977 Mar;74(3):1245–1249. doi: 10.1073/pnas.74.3.1245. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Lemna W. K., Feldman G. L., Kerem B., Fernbach S. D., Zevkovich E. P., O'Brien W. E., Riordan J. R., Collins F. S., Tsui L. C., Beaudet A. L. Mutation analysis for heterozygote detection and the prenatal diagnosis of cystic fibrosis. N Engl J Med. 1990 Feb 1;322(5):291–296. doi: 10.1056/NEJM199002013220503. [DOI] [PubMed] [Google Scholar]
  10. Newton C. R., Heptinstall L. E., Summers C., Super M., Schwarz M., Anwar R., Graham A., Smith J. C., Markham A. F. Amplification refractory mutation system for prenatal diagnosis and carrier assessment in cystic fibrosis. Lancet. 1989 Dec 23;2(8678-8679):1481–1483. doi: 10.1016/s0140-6736(89)92931-0. [DOI] [PubMed] [Google Scholar]
  11. Reed R., Maniatis T. The role of the mammalian branchpoint sequence in pre-mRNA splicing. Genes Dev. 1988 Oct;2(10):1268–1276. doi: 10.1101/gad.2.10.1268. [DOI] [PubMed] [Google Scholar]
  12. Riordan J. R., Rommens J. M., Kerem B., Alon N., Rozmahel R., Grzelczak Z., Zielenski J., Lok S., Plavsic N., Chou J. L. Identification of the cystic fibrosis gene: cloning and characterization of complementary DNA. Science. 1989 Sep 8;245(4922):1066–1073. doi: 10.1126/science.2475911. [DOI] [PubMed] [Google Scholar]
  13. Rommens J. M., Iannuzzi M. C., Kerem B., Drumm M. L., Melmer G., Dean M., Rozmahel R., Cole J. L., Kennedy D., Hidaka N. Identification of the cystic fibrosis gene: chromosome walking and jumping. Science. 1989 Sep 8;245(4922):1059–1065. doi: 10.1126/science.2772657. [DOI] [PubMed] [Google Scholar]
  14. Rosenbloom C. L., Kerem B. S., Rommens J. M., Tsui L. C., Wainwright B., Williamson R., O'Brien W. E., Beaudet A. L. DNA amplification for detection of the XV-2c polymorphism linked to cystic fibrosis. Nucleic Acids Res. 1989 Sep 12;17(17):7117–7117. doi: 10.1093/nar/17.17.7117. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Saiki R. K., Gelfand D. H., Stoffel S., Scharf S. J., Higuchi R., Horn G. T., Mullis K. B., Erlich H. A. Primer-directed enzymatic amplification of DNA with a thermostable DNA polymerase. Science. 1988 Jan 29;239(4839):487–491. doi: 10.1126/science.2448875. [DOI] [PubMed] [Google Scholar]
  16. Saiki R. K., Walsh P. S., Levenson C. H., Erlich H. A. Genetic analysis of amplified DNA with immobilized sequence-specific oligonucleotide probes. Proc Natl Acad Sci U S A. 1989 Aug;86(16):6230–6234. doi: 10.1073/pnas.86.16.6230. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Sheffield V. C., Cox D. R., Lerman L. S., Myers R. M. Attachment of a 40-base-pair G + C-rich sequence (GC-clamp) to genomic DNA fragments by the polymerase chain reaction results in improved detection of single-base changes. Proc Natl Acad Sci U S A. 1989 Jan;86(1):232–236. doi: 10.1073/pnas.86.1.232. [DOI] [PMC free article] [PubMed] [Google Scholar]

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