title: Genetic analysis of quantitative traits in highly ascertained samples: total serum IgE in families with asthma.
abstract: The objective of this study was to compare the effect of an approximate ascertainment correction using proband phenotypes with heuristic corrections based on sample trait means and on published "standard" population values. Data were from the Collaborative Study on the Genetics of Asthma, which comprises 225 families ascertained through sib pairs affected with asthma. In variance component linkage analysis of IgE no lod scores greater than 3.0 were observed, either with or without several attempted corrections for ascertainment. The ascertained nature of the sample may have compromised the power to detect linkage to a quantitative trait (IgE) associated with the focal phenotype (asthma).
authors.affiliation: Department of Genetics, Southwest Foundation for Biomedical Research, San Antonio, Texas, USA.
authors.forename: J
authors.initials: J
authors.lastname: Bethony
authors.forename: J T
authors.initials: JT
authors.lastname: Williams
authors.forename: L
authors.initials: L
authors.lastname: Almasy
authors.forename: R
authors.initials: R
authors.lastname: Corrêa-Oliveira
authors.forename: J C
authors.initials: JC
authors.lastname: Blangero
authors.forename: S
authors.initials: S
authors.lastname: Williams-Blangero
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001249:Asthma / Q000453:epidemiology / Q000235:genetics* / Q000276:immunology; D015982:Bias; D002648:Child; D005260:Female; D005787:Gene Frequency; D005828:Genetics, Population; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood*; D008297:Male; D019655:Quantitative Trait, Heritable; D014481:United States
chemical_list: D007073:Immunoglobulin E