Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.

Multimarker Transmission/Disequilibrium Tests (TDTs) are very robust association tests to population admixture and structure which may be used to identify susceptibility loci in genome-wide association studies. Multimarker TDTs using several markers may increase power by capturing high-degree associ...

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Autores principales:	Mara M Abad-Grau, Nuria Medina-Medina, Rosana Montes-Soldado, Fuencisla Matesanz, Vineet Bafna
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f312c6bdea3947499321b410ecd71dae
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spelling	oai:doaj.org-article:f312c6bdea3947499321b410ecd71dae2021-11-18T07:27:50ZSample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.1932-620310.1371/journal.pone.0029613https://doaj.org/article/f312c6bdea3947499321b410ecd71dae2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22363405/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Multimarker Transmission/Disequilibrium Tests (TDTs) are very robust association tests to population admixture and structure which may be used to identify susceptibility loci in genome-wide association studies. Multimarker TDTs using several markers may increase power by capturing high-degree associations. However, there is also a risk of spurious associations and power reduction due to the increase in degrees of freedom. In this study we show that associations found by tests built on simple null hypotheses are highly reproducible in a second independent data set regardless the number of markers. As a test exhibiting this feature to its maximum, we introduce the multimarker 2-Groups TDT (mTDT(2G)), a test which under the hypothesis of no linkage, asymptotically follows a χ2 distribution with 1 degree of freedom regardless the number of markers. The statistic requires the division of parental haplotypes into two groups: disease susceptibility and disease protective haplotype groups. We assessed the test behavior by performing an extensive simulation study as well as a real-data study using several data sets of two complex diseases. We show that mTDT(2G) test is highly efficient and it achieves the highest power among all the tests used, even when the null hypothesis is tested in a second independent data set. Therefore, mTDT(2G) turns out to be a very promising multimarker TDT to perform genome-wide searches for disease susceptibility loci that may be used as a preprocessing step in the construction of more accurate genetic models to predict individual susceptibility to complex diseases.Mara M Abad-GrauNuria Medina-MedinaRosana Montes-SoldadoFuencisla MatesanzVineet BafnaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 2, p e29613 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mara M Abad-Grau Nuria Medina-Medina Rosana Montes-Soldado Fuencisla Matesanz Vineet Bafna Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.
description	Multimarker Transmission/Disequilibrium Tests (TDTs) are very robust association tests to population admixture and structure which may be used to identify susceptibility loci in genome-wide association studies. Multimarker TDTs using several markers may increase power by capturing high-degree associations. However, there is also a risk of spurious associations and power reduction due to the increase in degrees of freedom. In this study we show that associations found by tests built on simple null hypotheses are highly reproducible in a second independent data set regardless the number of markers. As a test exhibiting this feature to its maximum, we introduce the multimarker 2-Groups TDT (mTDT(2G)), a test which under the hypothesis of no linkage, asymptotically follows a χ2 distribution with 1 degree of freedom regardless the number of markers. The statistic requires the division of parental haplotypes into two groups: disease susceptibility and disease protective haplotype groups. We assessed the test behavior by performing an extensive simulation study as well as a real-data study using several data sets of two complex diseases. We show that mTDT(2G) test is highly efficient and it achieves the highest power among all the tests used, even when the null hypothesis is tested in a second independent data set. Therefore, mTDT(2G) turns out to be a very promising multimarker TDT to perform genome-wide searches for disease susceptibility loci that may be used as a preprocessing step in the construction of more accurate genetic models to predict individual susceptibility to complex diseases.
format	article
author	Mara M Abad-Grau Nuria Medina-Medina Rosana Montes-Soldado Fuencisla Matesanz Vineet Bafna
author_facet	Mara M Abad-Grau Nuria Medina-Medina Rosana Montes-Soldado Fuencisla Matesanz Vineet Bafna
author_sort	Mara M Abad-Grau
title	Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.
title_short	Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.
title_full	Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.
title_fullStr	Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.
title_full_unstemmed	Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.
title_sort	sample reproducibility of genetic association using different multimarker tdts in genome-wide association studies: characterization and a new approach.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/f312c6bdea3947499321b410ecd71dae
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Sample reproducibility of genetic association using different multimarker TDTs in genome-wide association studies: characterization and a new approach.

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