Evidence map›Paper›PMID 2301394›Full record

ArticleAmerican journal of human genetics1990

Linkage strategies for genetically complex traits. III. The effect of marker polymorphism on analysis of affected relative pairs.

N Risch

Erratum issuedAbstract read
In one paragraph

Article in American journal of human genetics, 1990. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 91 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
91citing papers in PubMed, 3 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

91 citing papers in PubMed, 3 syntheses or guidelines pooled it.

  1. Meta-analysis of genome-wide linkage studies across autoimmune diseases.European journal of human genetics : EJHG · 2009
    Pooled it
  2. Pooled it
  3. Pooled it
  4. Article
  5. Article
  6. 2015 Curt Stern Award.American journal of human genetics · 2016
    Article
  7. Article
  8. Article
  9. Article
  10. Type 2 Diabetes Genetics: Beyond GWAS.Journal of diabetes & metabolism · 2012
    Article
  11. Article
  12. A twin approach to unraveling epigenetics.Trends in genetics : TIG · 2011
    Review
  13. Review
  14. Article
  15. Article
  16. Bayesian intervals for linkage locations.Genetic epidemiology · 2009
    Article
  17. Review
  18. Article
  19. Review
  20. Article

31 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

1 author.

N RischDepartment of Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT 06510.

Funding

NIGMS NIH HHS GM 39812
6 · The paper itself

Abstract

The results from the second paper of this series are reexamined for markers that are not completely polymorphic. A maximum lod score (MLS) criterion is defined for affected relative pairs. The expected MLS (EMLS) is calculated as a function of the marker polymorphic information content (PIC) for various values of lambda R (relative risk ratio) and different relative types by using simulations. An m-allele model with equal allele frequencies is employed. The EMLS is calculated for two sampling strategies: scheme 1, which uses pairs only, and scheme 2, which also includes additional informative relatives. For scheme 2, the percent of the maximum achievable EMLS (i.e., for a marker with a PIC of 1.0) is approximately equal to the marker PIC value for all relative types. For scheme 1, the EMLS is greatly diminished unless PIC is high, especially for distant relatives. For example, scheme 1 is not cost-effective for sibs unless PIC greater than .7; for second- and third-degree relatives, PIC must be greater than .85. Therefore, in general, it will be worthwhile to type additional relatives in linkage studies using affected pairs. The comparative value of sibs versus distant relatives depends on lambda R, recombination theta, and PIC. For large lambda R and PIC values, distant relatives are preferred. Alternatively, for smaller lambda R and PIC values, sibs are best.

Indexed as

Genetic LinkageGenetics, MedicalModels, GeneticModels, StatisticalFemaleHumansLod ScoreMalePedigreePolymorphism, GeneticProbability

Identifiers

PMID2301394
PMCPMC1684966

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.