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hsrecombi (version 1.0.1)

Estimation of Recombination Rate and Maternal LD in Half-Sibs

Description

Paternal recombination rate and maternal linkage disequilibrium (LD) are estimated for pairs of biallelic markers such as single nucleotide polymorphisms (SNPs) from progeny genotypes and sire haplotypes. The implementation relies on paternal half-sib families. If maternal half-sib families are used, the roles of sire/dam are swapped. Multiple families can be considered. For parameter estimation, at least one sire has to be double heterozygous at the investigated pairs of SNPs. Based on recombination rates, genetic distances between markers can be estimated. Markers with unusually large recombination rate to markers in close proximity (i.e. putatively misplaced markers) shall be discarded in this derivation. A workflow description is attached as vignette. *A pipeline is available at GitHub* Hampel, Teuscher, Gomez-Raya, Doschoris, Wittenburg (2018) "Estimation of recombination rate and maternal linkage disequilibrium in half-sibs" . Gomez-Raya (2012) "Maximum likelihood estimation of linkage disequilibrium in half-sib families" .

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Version

Install

install.packages('hsrecombi')

Monthly Downloads

314

Version

1.0.1

License

GPL (>= 2)

Maintainer

D<c3><b6>rte Wittenburg

Last Published

June 7th, 2023

Functions in hsrecombi (1.0.1)

targetregion

Description of the targetregion data set
hapSire

targetregion: sire haplotypes
rao

System of genetic-map functions
startvalue

Start value for maternal allele and haplotype frequencies
hsrecombi

Estimation of recombination rate and maternal LD
checkCandidates

Candidates for misplacement
bestmapfun

Best fitting genetic-map function
LDHScpp

Expectation Maximisation (EM) algorithm
editraw

Editing results of hsrecombi
felsenstein

Felsenstein's genetic map function
geneticPosition

Estimation of genetic position
daughterSire

targetregion: allocation of paternal half-sib families
countNumbers

Count genotype combinations at 2 SNPs
haldane

Haldane's genetic map function
genotype.chr

targetregion: progeny genotypes
makehap

Make list of imputed sire haplotypes
loglikfun

Calculate log-likelihood function
map.chr

targetregion: physical map
rao inverse

Approximation to inverse of Rao's system of map functions
makehappm

Make list of imputed haplotypes and estimate recombination rate
makehaplist

Make list of sire haplotypes
karlin

Liberman and Karlin's genetic map function
kosambi

Kosambi's genetic map function