Evidence map›Paper›PMID 21226974›Full record

ArticleGenetics research2011

Variation in actual relationship as a consequence of Mendelian sampling and linkage.

W G Hill, B S Weir

Open access · bronzeAbstract read
In one paragraph

Article in Genetics research, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 166 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
166citing papers in PubMed, 1 pooled it
12.0field-weighted citation impact, top 1% of its field
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

166 citing papers in PubMed, 1 synthesis or guideline pooled it, 366 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Genomic Analysis of Inbreeding Depression on Productive Traits in Rubia Galega Beef Cattle Breed.Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie · 2026
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  15. On ARGs, pedigrees, and genetic relatedness matrices.bioRxiv : the preprint server for biology · 2025
    Article
  16. Article
  17. Estimating realized relatedness in free-ranging macaques by inferring identity-by-descent segments.Proceedings of the National Academy of Sciences of the United States of America · 2025
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106 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

2 authors at 2 institutions in 2 countries.

W G HillInstitute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK. w.g.hill@ed.ac.uk
B S Weir
University of Edinburgh · GBUniversity of Washington · US

Funding

Psychosocial Influences on Rural Children's Oral HealthR01DE014899 · NIDCR · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI FOXMAN, BETSY, MARAZITA, MARY L. · 2002 to 2020
$39.9M
Theoretical Population Genetics SupplementR01GM075091 · NIGMS · UNIVERSITY OF WASHINGTON · PI WEIR, BRUCE S. · 2006 to 2020
$4.7M
Dental Caries: Whole Genome Association and Gene x Environment StudiesU01DE018903 · NIDCR · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI MARAZITA, MARY L. · 2007 to 2010
$1.2M
NHGRI NIH HHS HHSN268200782096CNIDCR NIH HHS R01 DE014899NIDCR NIH HHS R01-DE014899NIDCR NIH HHS U01 DE018903NIDCR NIH HHS U01-DE018904NIGMS NIH HHS R01 GM075091PHS HHS HGU0044446
6 · The paper itself

Abstract

Although the expected relationship or proportion of genome shared by pairs of relatives can be obtained from their pedigrees, the actual quantities deviate as a consequence of Mendelian sampling and depend on the number of chromosomes and map length. Formulae have been published previously for the variance of actual relationship for a number of specific types of relatives but no general formula for non-inbred individuals is available. We provide here a unified framework that enables the variances for distant relatives to be easily computed, showing, for example, how the variance of sharing for great grandparent-great grandchild, great uncle-great nephew, half uncle-nephew and first cousins differ, even though they have the same expected relationship. Results are extended in order to include differences in map length between sexes, no recombination in males and sex linkage. We derive the magnitude of skew in the proportion shared, showing the skew becomes increasingly large the more distant the relationship. The results obtained for variation in actual relationship apply directly to the variation in actual inbreeding as both are functions of genomic coancestry, and we show how to partition the variation in actual inbreeding between and within families. Although the variance of actual relationship falls as individuals become more distant, its coefficient of variation rises, and so, exacerbated by the skewness, it becomes increasingly difficult to distinguish different pedigree relationships from the actual fraction of the genome shared.

Indexed as

AnimalsChromosome MappingComputer SimulationGenetic LinkageGenomeInbreedingModels, GeneticPedigreeProbabilityRabbits

Identifiers

PMID21226974
PMCPMC3070763
OpenAlexW2134049753

What Socratic holds

Textmetadata
LicenceTDM
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 Socratic graph.