Abstract：
BACKGROUND:Evidence for genetic contribution to complex diseases is described by recurrence risks to relatives of diseased individuals. Genome-wide association studies allow a description of the genetics of the same diseases in terms of risk loci, their effects and allele frequencies. To reconcile the two descriptions requires a model of how risks from individual loci combine to determine an individual's overall risk. METHODS:We derive predictions of risk to relatives from risks at individual loci under a number of models and compare them with published data on disease risk. RESULTS:The model in which risks are multiplicative on the risk scale implies equality between the recurrence risk to monozygotic twins and the square of the recurrence risk to sibs, a relationship often not observed, especially for low prevalence diseases. We show that this theoretical equality is achieved by allowing impossible probabilities of disease. Other models, in which probabilities of disease are constrained to a maximum of one, generate results more consistent with empirical estimates for a range of diseases. CONCLUSIONS:The unconstrained multiplicative model, often used in theoretical studies because of its mathematical tractability, is not a realistic model. We find three models, the constrained multiplicative, Odds (or Logit) and Probit (or liability threshold) models, all fit the data on risk to relatives. Currently, in practice it would be difficult to differentiate between these models, but this may become possible if genetic variants that explain the majority of the genetic variance are identified.
journal_name
Genome Medjournal_title
Genome medicineauthors
Wray NR,Goddard MEdoi
10.1186/gm131subject
Has Abstractpub_date
2010-02-02 00:00:00pages
10issue
2issn
1756-994Xpii
gm131journal_volume
2pub_type
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