The document describes how to create a kinship matrix using microsatellite data in Microsatellite Analyzer (MSA) software by first preparing genotypic data from molecular markers in a spreadsheet, importing this data into MSA and running an analysis to generate a pairwise kinship coefficient matrix, which provides a measure of genetic relatedness between individuals that can be used in association mapping studies to account for population structure.
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Association mapping, also known as "linkage disequilibrium mapping", is a method of mapping quantitative trait loci (QTLs) that takes advantage of linkage disequilibrium to link phenotypes to genotypes.Varioius strategey involved in association mapping is discussed in this presentation
Banoth Madhu: Map based gene cloning in plant. In the process of map-based cloning, one starts with a mutant and eventually identifies the gene responsible for the altered phenotype, allowing the plant to tell you what genes are important in the physiological process of interest and using the genetic relationship between a gene and a marker as the basis for beginning a search for a gene
Association mapping, also known as "linkage disequilibrium mapping", is a method of mapping quantitative trait loci (QTLs) that takes advantage of linkage disequilibrium to link phenotypes to genotypes.Varioius strategey involved in association mapping is discussed in this presentation
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Association genetics‟ or ‟association studies,” or ‟linkage disequilibrium mapping”.
Tool to resolve complex trait variation down to the sequence level by exploiting historical and evolutionary recombination events at the population level.
Natural population surveyed to determine MTA using LD.
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Association mapping has been widely used to study the genetic basis of complex traits in human and animal systems and is a very efficient and effective method for confirming candidate genes or for identifying new genes (Altshuler et al., 2008). Association mapping is now being increasingly used in a wide range of plants (Rafalski, 2010), where it appears to be more powerful than in humans or animals (Zhu et al., 2008). Unlike linkage mapping, association mapping can explore all the recombination events and mutations in a given population and with a higher resolution (Yu and Buckler, 2006). However, association mapping has a lower power to detect rare alleles in a population, even those with large effects, than linkage mapping (Hill et al., 2008). Yan et al., (2010) demonstrated that the gene encoding β-carotene hydroxylase 1 (crtRB1) underlies a principal quantitative trait locus associated with β-carotene concentration and conversion in maize kernels has been identified through candidate gene strategy of association mapping.
Quantitative trait loci (QTL) analysis and its applications in plant breedingPGS
Abstract
Many agriculturally important traits such as grain yield, protein content and relative disease resistance are controlled by many genes and are known as quantitative traits (also polygenic or complex traits). A quantitative trait depends on the cumulative actions of many genes and the environment. The genomic regions that contain genes associated with a quantitative trait are known as quantitative trait loci (QTLs). Thus, a QTL could be defined as a genomic region responsible for a part of the observed phenotypic variation for a quantitative trait. A QTL can be a single gene or a cluster of linked genes that affect the trait. The effects of individual QTLs may differ from each other and change from environment to environment. The genetics of a quantitative trait can often be deduced from the statistical analysis of several segregating populations. Recently, by using molecular markers, it is feasible to analyze quantitative traits and identify individual QTLs or genes controlling the traits of interest in breeding programs.
Genome-wide association study (GWAS) technology has been a primary method for identifying the genes responsible for diseases and other traits for the past ten years. GWAS continues to be highly relevant as a scientific method. Over 2,000 human GWAS reports now appear in scientific journals. Our free eBook aims to explain the basic steps and concepts to complete a GWAS experiment.
Association genetics‟ or ‟association studies,” or ‟linkage disequilibrium mapping”.
Tool to resolve complex trait variation down to the sequence level by exploiting historical and evolutionary recombination events at the population level.
Natural population surveyed to determine MTA using LD.
Genotyping by Sequencing is a robust,fast and cheap approach for high throughput marker discovery.It has applications in crop improvement programs by enhancing identification of superior genotypes.
Association mapping approaches for tagging quality traits in maizeSenthil Natesan
Association mapping has been widely used to study the genetic basis of complex traits in human and animal systems and is a very efficient and effective method for confirming candidate genes or for identifying new genes (Altshuler et al., 2008). Association mapping is now being increasingly used in a wide range of plants (Rafalski, 2010), where it appears to be more powerful than in humans or animals (Zhu et al., 2008). Unlike linkage mapping, association mapping can explore all the recombination events and mutations in a given population and with a higher resolution (Yu and Buckler, 2006). However, association mapping has a lower power to detect rare alleles in a population, even those with large effects, than linkage mapping (Hill et al., 2008). Yan et al., (2010) demonstrated that the gene encoding β-carotene hydroxylase 1 (crtRB1) underlies a principal quantitative trait locus associated with β-carotene concentration and conversion in maize kernels has been identified through candidate gene strategy of association mapping.
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Creating a Kinship Matrix Using MSA
1. Creating a Kinship Matrix using
Microsatellite Analyzer (MSA)
Zhifen Zhang
The Ohio State University
2. Why create a kinship matrix?
• Visualize family relatedness
• Use in association mapping
The Objective of this Tutorial:
To introduce one approach to generate a kinship matrix
for a population
3. Background
Types of Populations for Association Mapping (Yu, et al. 2006):
Population Type Pros Cons
“Ideal population” Minimal population Difficult to collect,
structure and familial small size
relatedness Narrow genetic basis
Gives the greatest statistical
power
Family-based population Minimal population Limited sample size and
structure allelic diversity
Population with Larger size and broader False positives or loss in
population structure allelic diversity power due to familial
relatedness.
Population with familial Larger size and broader Inadequate control for
relationships within allelic diversity false positives due to
structured population population structure
The highlighted population needs a kinship matrix for analysis.
4. Scheme of Mapping
Germplasm
Phenotyping (Y) Genotyping
Genome-wide scan Background
markers
Genome-wide Population structure
polymorphisms (G) (Q), kinship (K)
Association analysis (General Mixed Model): Y=G+Q+K+e
Zhu et al. 2006
5. Coefficient of Kinship
Coefficient of kinship is used to measure relatedness
DEFINITION: Coefficient of kinship is the probability that
the alleles of a particular locus chosen randomly from
two individuals are identical by descent (Lange, 2002)
* Identical by descent: the identical alleles from two
individuals arise from the same allele in an earlier
generation
6. Kinship Matrix Calculation
The kinship coefficient is the probability that an allele (a) taken
randomly from population i (at a given locus) will be identical by
descent to an allele taken randomly from population j at the same
locus
Kf= ∑k∑a (fai * faj)/D
Where ∑k∑a (fai * faj)/D is the sum of all loci and all alleles;
fai is the frequency of allele a in population i, faj is the frequency of allele a in
population j, D is the number of loci.
Cavalli-Sforza and Bodmer, 1971.
MSA manual page 23
7. An Example
Population Locus A Locus B Locus C
611R2 A b c
A b c
611R3 A B c
A B c
Coefficient of kinship for populations 611R2 and 611R3:
Kf= ∑k∑a (fai * faj)/D
= (1x1+1x0 + 0x1+1x1)/3=2/3
The frequencies of alleles A and c in populations 611R2 and 611R3 are 1; the
frequency of allele b in population 611R2 is 1 and 0 while in population 611R3 is 0
8. Kinship Matrix
In the unified mixed model (Yu et al. 2006),
marker-based kinship coefficient matrices are included
A marker-based kinship coefficient matrix can be
generated using Microsatellite Analyzer (MSA)
9. Pipeline for Matrix Generation
Genotyping with Data Entry to Create a
Markers Spreadsheet
Arrange Data in a Format
Recognized by MSA
Import the .dat Run the Kinship
File into MSA Coefficient Analysis
10. A Case Study
Bacterial spot data provided by Dr. David Francis,
The Ohio State University
11. Data Preparation
For genotyping, molecular markers can be:
Microsatellite (Simple Sequence Repeat, SSR)
SNP (Single Nucleotide Polymorphism)
RFLP (Restriction Fragment Length Polymorphism)
AFLP (Amplified Fragment Length Polymorphism)
Other sequencing markers
MSA was designed for SSR analysis
For other marker types, a value is designated for each
allele, e.g. For SNPs, A can be 11, C can be 12, G can be 13, and T
can be 14.
12. Data Entry
After genotyping, a spreadsheet of genotypic data can
be generated as shown below.
Marker
Population Genotype Score
Genotype Score: 0 is homozygous for allele a, 1 is homozygous for allele b, 2 is
heterozygous.
13. Data Formatting
Population #
Give a new value to each allele
Mating scheme for each marker
Group name: default “1”
These 3 cells should
be empty.
Row 1 can be left empty except for columns a, b, and c, which have to be filled. In cell
A1, enter ‘1’. Row 2 is marker name. Genotype data start in row 3.
14. Data Formatting
Two-row entry for each individual (we are treating individuals as
populations) to specify heterozygotes and homozygotes
Homozygotes have the Heterozygotes have
same value in both different values in each
rows. row.
15. After Formatting
Save the file in a “Tab Delimited” text format, change the extension
name “.txt” into “.dat”.
30. Number of
individuals Kinship Matrix
The population (line) code Please remember that the value in the
matrix is “1-kinship coefficient”.
31. Final Matrix
Use “1-X” (X is the value of each cell in the matrix) to generate a new
matrix that will be the kinship matrix in Excel.
32. The Mixed Model
Phenotype Marker Residual or
score effect Error
Y= αX+ γM+ βQ + υK + e
Population
Fixed Effect structure
rather than
markers
Yu et al. 2006
33. References Cited & External Link
References Cited
• Cavalli-Sforza, L. L., and W. F. Bodmer. 1971. The genetics of human
populations, W.H. Freeman and Company, NY.
• Lange, K. 2002. Mathematical and statistical methods for genetic analysis, 2nd
edition. Springer-Verlag, NY.
• Yu, J. G. Pressoir, W. H. Briggs, I. V. Bi, M. Yamasaki, J. F. Doebley, M. D.
McMullen, B. S. Gaut, D. M. Nielsen, J. B. Holland, S. Kresovich, and E. S.
Buckler. 2006. A unified mixed-model method for association mapping that
accounts for multiple levels of relatedness. Nature Genetics 38: 203-208.
(Available online at: http://dx.doi.org/10.1038/ng1702) (verified 8 July 2011).
• Zhu, C. M. Gore, E. S. Buckler, and J. Yu. 2008. Status and prospects of
association mapping in plants. The Plant Genome 1: 5-20. (Available online at:
http://dx.doi.org/10.3835/plantgenome2008.02.0089) (verified 8 July 2011).
External Link
• Dieringer, D. Microsatellite analyzer (MSA) [Online]. Available at:
http://i122server.vu-wien.ac.at/MSA/MSA_download.html (verified 8 July
2011).