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Cited by 277

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Genetic epidemiology of single-nucleotide polymorphisms

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Collins, A., Lonjou, C., Morton, N. E.·1999·Proceedings of the National Academy of Sciences

Abstract

On the causal hypothesis, most genetic determinants of disease are single-nucleotide polymorphisms (SNPs) that are likely to be selected as markers for positional cloning. On the proximity hypothesis, most disease determinants will not be included among markers but may be detected through linkage disequilibrium with other SNPs. In that event, allelic association among SNPs is an essential factor in positional cloning. Recent simulation based on monotonic population expansion suggests that useful association does not usually extend beyond 3 kb. This is contradicted by significant disequilibrium at much greater distances, with corresponding reduction in the number of SNPs required for a cost-effective genome scan. A plausible explanation is that cyclical expansions follow population bottlenecks that establish new disequilibria. Data on more than 1,000 locus pairs indicate that most disequilibria trace to the Neolithic, with no apparent difference between haplotypes that are random or selected through a major disease gene. Short duration may be characteristic of alleles contributing to disease susceptibility and haplotypes characteristic of particular ethnic groups. Alleles that are highly polymorphic in all ethnic groups may be older, neutral, or advantageous, in weak disequilibrium with nearby markers, and therefore less useful for positional cloning of disease genes. Significant disequilibrium at large distance makes the number of suitably chosen SNPs required for genome screening as small as 30,000, or 1 per 100 kb, with greater density (including less common SNPs) reserved for candidate regions.

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Metadata

Authors
Collins, A., Lonjou, C., & Morton, N. E.
Venue
Proceedings of the National Academy of Sciences
Published
1999-12-21
Volume
96
Issue
26
Pages
15173-15177
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1997494071
Cited by
277
References
28
FWCI
22.80
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Genetic epidemiology of single-nucleotide polymorphisms. https://app.cochat.ai/papers/10.1073/pnas.96.26.15173
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Collins, A., Lonjou, C., & Morton, N. E. (1999). Genetic epidemiology of single-nucleotide polymorphisms. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.96.26.15173

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