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PMID: 7691712 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Extended haplotype analysis of cystic fibrosis mutations and its implications for the selective advantage hypothesis.

Human genetics ·Vol. 92 ·No. 3 ·1993-10-01 ·Pages 289-95

Sereth H, Shoshani T, Bashan N, Kerem BS

Abstract

The major cystic fibrosis (CF) mutation, delta F508, is associated with one haplotype (B) determined by the two polymorphic markers, XV2C and KM19. This haplotype is rare (15%) among non-CF chromosomes. Its frequency among non-delta F508 CF chromosomes is 50% with variation between populations. One hypothesis for the high frequency of CF haplotype B chromosomes suggests that there was a selective advantage for CF mutations on this specific "background" as a result of epistatic selection at other closely linked loci. Since the XV2C and KM19 markers are located 200 kb 5' to the CF gene and span only 60 kb, an extended haplotype analysis was needed to test this hypothesis. Haplotypes were determined for 183 CF and 120 non-CF Israeli chromosomes at the XV2C and KM19 loci and at three intragenic polymorphic sites (GATT in intron 6A, TUB18 in intron 19, and 24M in exon 24). Among the studied chromosomes the frequency of non-delta F508 CF chromosomes associated with haplotype B was 70% (88% among Ashkenazi CF chromosomes). Nine mutations (delta F508, W1282X, G542X, N1303K, 3849 + 10 kb C-->T, Q359K/T360K, S549I, S549R, and 1717-1G-->A) were identified among the studied chromosomes. These mutations accounted for 96% of CF chromosomes of Ashkenazi origin. Haplotype B was associated with seven of these (delta F508, W1282X, G542X, N1303K, Q359K/T360K, S549R, and 1717-1G-->A). The extended haplotype analysis revealed that in five of the seven mutations associated with the haplotype B, 97% of the chromosomes shared the same intragenic haplotype, 212. The variation found in 3% of the chromosomes was only in the GATT repeat. Two mutations, W1282X and 1717-1G-->A, were associated with a completely different intragenic haplotype, 121. The results of this study indicate that grouping of CF chromosome by haplotype analysis spanning a small extragenic region might not be sufficient. In addition, the results of the extended haplotype analysis indicate that all the studied CF chromosomes that carry the same mutation derived from the same origin. Furthermore, the results indicate that the majority of the CF mutations are associated with the same extended haplotype, supporting the selective advantage hypothesis.

MeSH Terms

Alleles Base Sequence Cystic Fibrosis/epidemiology,ethnology,genetics Cystic Fibrosis Transmembrane Conductance Regulator DNA Mutational Analysis DNA Primers Epistasis, Genetic Gene Frequency Genes, Lethal Haplotypes Humans Israel/epidemiology Jews/genetics Membrane Proteins/genetics Molecular Epidemiology Molecular Sequence Data Mutation Polymerase Chain Reaction Polymorphism, Restriction Fragment Length Selection, Genetic

Chemicals

CFTR protein, human DNA Primers Membrane Proteins Cystic Fibrosis Transmembrane Conductance Regulator

Authors & Affiliations

4 authors, click to expand affiliations / ORCID

Sereth H

Genetics Department, Hebrew University of Jerusalem, Israel.

Shoshani T

Bashan N

Kerem B S

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Article Info

Journal

Human genetics

Abbr.

Hum Genet

ISSN

0340-6717

DOI

10.1007/BF00244474

Published

1993-10-01

Pages

289-95

Language

English

Region

Germany

NLM ID

7613873

Subset

External Links

PubMed source DOI: 10.1007/BF00244474 View journal details

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Extended haplotype analysis of cystic fibrosis mutations and its implications for the selective advantage hypothesis.

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