Effect of within-strain sample size on GTL detection and mapping using recombinant inbred mouse strains

John Belknap

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

Increasing the number of mice used to calculate recombinant inbred (RJ) strain means increases the accuracy of determining the phenotype associated with each genotype (strain), which in turn enhances quantitative trait locus (QTL) detection and mapping. The purpose of this paper is to examine quantitatively the effect of within-strain sample size (n) on additive QTL mapping efficiency and to make comparisons with F2 and backcross (BC) populations, where each genotype is represented by only a single mouse. When 25 RI strains are used, the estimated equivalent number of F2 mice yielding the same power to detect Qtls varies inversely as a function of the heritability of the trait in the RI population (h(RI)2). For example, testing 25 strains with n = 10 per strain is approximately equivalent to 160 F2 mice when h(RI)2 = 0.2, but only 55 when h(RI)2 = 0.6. While increasing n is always beneficial, the gain in power as n increases is greatest when h(RI)2 is low and is much diminished at high h(RI)2 values. Thus, when h(RI)2 is high, there is little advantage of large n, even when n approaches infinity. A cost analysis suggested that RI populations are more cost- effective than conventional selectively genotyped F2 populations at h(RI)2 values likely to be seen in behavioral studies. However, with DNA pooling, this advantage is greatly reduced and may be reversed depending on the values of h(RI)2 and n.

Original languageEnglish (US)
Pages (from-to)29-38
Number of pages10
JournalBehavior Genetics
Volume28
Issue number1
DOIs
StatePublished - 1998

Fingerprint

Inbred Strains Mice
Sample Size
genotype
cost analysis
Quantitative Trait Loci
mice
heritability
Population
phenotype
Genotype
DNA
Costs and Cost Analysis
sampling
quantitative trait loci
cost
Phenotype
effect
detection
comparison
testing

Keywords

  • Chromosome mapping
  • Mouse
  • Quantitative genetics
  • Quantitative trait locus
  • Recombinant inbred strai

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)
  • Behavioral Neuroscience
  • Psychology(all)

Cite this

Effect of within-strain sample size on GTL detection and mapping using recombinant inbred mouse strains. / Belknap, John.

In: Behavior Genetics, Vol. 28, No. 1, 1998, p. 29-38.

Research output: Contribution to journalArticle

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