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  • Title: Isolation of a new DNA marker in linkage disequilibrium with cystic fibrosis, situated between J3.11 (D7S8) and IRP.
    Author: Estivill X, McLean C, Nunes V, Casals T, Gallano P, Scambler P, Williamson R.
    Journal: Am J Hum Genet; 1989 May; 44(5):704-10. PubMed ID: 2565082.
    Abstract:
    A cosmid library of recombinants containing nonmethylated CpG sites for rare-cutter restriction enzymes was used previously to isolate the gene IRP and four polymorphic DNA markers (pPT-3, pXV-2c, pCS.7, and pKM.19) which are close to and in linkage disequilibrium with the cystic fibrosis (CF) mutation. We have analyzed several new clones from the same library and have isolated a further cosmid, cNX.6d, which maps approximately 160 kb from CS.7, in the J3.11 direction. A DNA fragment (pMP6d-9) (D7S399) derived from cosmid cNX.6d detects a frequent polymorphism with MspI. Strong linkage disequilibrium between CF and MP6d-9 is found in European populations. Recombinations in two families suggest that CF is between the MspI polymorphic site recognized by pMP6d-9 and the polymorphism recognized by pJ3.11. The new marker is the closest, to date, to CF and will be useful for prenatal diagnosis and carrier testing.
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