Evidence map›Paper›PMID 15492927›Full record

ArticleAmerican journal of human genetics2004

Ignoring linkage disequilibrium among tightly linked markers induces false-positive evidence of linkage for affected sib pair analysis.

Qiqing Huang, Sanjay Shete, Christopher I Amos

Abstract readComparative Study
In one paragraph

Article in American journal of human genetics, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 90 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
90citing papers in PubMed, 1 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

90 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  6. Mixtures with relatives and linked markers.International journal of legal medicine · 2016
    Article
  7. Can whole-exome sequencing data be used for linkage analysis?European journal of human genetics : EJHG · 2016
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30 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Qiqing HuangDepartment of Epidemiology, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030-4009, USA.
Sanjay Shete
Christopher I Amos

Funding

Tumor Evolution and Metastasis ProgramP30CA016672 · NCI · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI Scott Kopetz · 1985 to 2026
$290.8M
TRANSCRIPTIONAL REGULATION OF WT-1P01CA034936 · NCI · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI STRONG, LOUISE C · 1985 to 2010
$26.4M
GENETIC EPIDEMIOLOGY OF LUNG CANCERU01CA076293 · NCI · UNIVERSITY OF CINCINNATI · PI ANDERSON, MARSHALL W · 1999 to 2009
$11.5M
NARAC The Genetics of Rheumatoid ArthritisR01AR044422 · NIAMS · NORTH SHORE UNIVERSITY HOSPITAL · PI GREGERSEN, PETER K. · 1997 to 2011
$6.0M
Positional Gene Identification of Complex TraitsR01ES009912 · NIEHS · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI AMOS, CHRISTOPHER I. · 1999 to 2006
$3.3M
LINKAGE METHODS FOR QUANTITATIVE AND COMPLEX TRAITSR01HG002275 · NHGRI · UNIVERSITY OF TEXAS MD ANDERSON CAN CTR · PI AMOS, CHRISTOPHER I. · 2000 to 2002
$598k
NCI NIH HHS P01 CA034936NCI NIH HHS P01CA34936NCI NIH HHS P30 CA016672NCI NIH HHS P30CA16672NCI NIH HHS R01CA76293NCI NIH HHS U01 CA076293NHGRI NIH HHS R01 HG002275NHGRI NIH HHS R01HG02275NIAMS NIH HHS AR44422NIAMS NIH HHS N01AR82232NIAMS NIH HHS R01 AR044422NIEHS NIH HHS R01 ES009912NIEHS NIH HHS R01ES09912
6 · The paper itself

Abstract

Most multipoint linkage programs assume linkage equilibrium among the markers being studied. The assumption is appropriate for the study of sparsely spaced markers with intermarker distances exceeding a few centimorgans, because linkage equilibrium is expected over these intervals for almost all populations. However, with recent advancements in high-throughput genotyping technology, much denser markers are available, and linkage disequilibrium (LD) may exist among the markers. Applying linkage analyses that assume linkage equilibrium to dense markers may lead to bias. Here, we demonstrated that, when some or all of the parental genotypes are missing, assuming linkage equilibrium among tightly linked markers where strong LD exists can cause apparent oversharing of multipoint identity by descent (IBD) between sib pairs and false-positive evidence for multipoint model-free linkage analysis of affected sib pair data. LD can also mimic linkage between a disease locus and multiple tightly linked markers, thus causing false-positive evidence of linkage using parametric models, particularly when heterogeneity LOD score approaches are applied. Bias can be eliminated by inclusion of parental genotype data and can be reduced when additional unaffected siblings are included in the analysis.

Indexed as

Genetic LinkageBiasFalse Positive ReactionsGenetic MarkersHaplotypesLinkage DisequilibriumPedigreeSiblingsGenetic Markers

Identifiers

PMID15492927
PMCPMC1182145

What OpenQuestion holds

Textmetadata
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.