Whole-exome sequencing to analyze population structure, parental inbreeding, and familial linkage

Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from differ...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 113; no. 24; pp. 6713 - 6718
Main Authors Belkadi, Aziz, Pedergnana, Vincent, Cobat, Aurélie, Itan, Yuval, Vincent, Quentin B., Abhyankar, Avinash, Shang, Lei, El Baghdadi, Jamila, Bousfiha, Aziz, Alcais, Alexandre, Boisson, Bertrand, Casanova, Jean-Laurent, Abel, Laurent
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 14.06.2016
Subjects
Online AccessGet full text
ISSN0027-8424
1091-6490
1091-6490
DOI10.1073/pnas.1606460113

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Abstract Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Comparedwith GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome- wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.
AbstractList Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Compared with GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome-wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.
Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Compared with GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome-wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Compared with GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome-wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.
We compared the information provided by whole-exome sequencing (WES) and genome-wide single-nucleotide variant arrays in terms of principal component analysis, homozygosity rate estimation, and linkage analysis using 110 subjects originating from different regions of the world. WES provided an accurate prediction of population substructure using high-quality variants with a minor allele frequency > 2% and reliable estimation of homozygosity rates using runs of homozygosity. Finally, homozygosity mapping in 15 consanguineous families showed that WES led to powerful linkage analyses, particularly in coding regions. Overall, our study shows that WES could be used for several analyses that are very helpful to optimize the search for disease-causing exome variants. Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Compared with GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome-wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.
Significance We compared the information provided by whole-exome sequencing (WES) and genome-wide single-nucleotide variant arrays in terms of principal component analysis, homozygosity rate estimation, and linkage analysis using 110 subjects originating from different regions of the world. WES provided an accurate prediction of population substructure using high-quality variants with a minor allele frequency > 2% and reliable estimation of homozygosity rates using runs of homozygosity. Finally, homozygosity mapping in 15 consanguineous families showed that WES led to powerful linkage analyses, particularly in coding regions. Overall, our study shows that WES could be used for several analyses that are very helpful to optimize the search for disease-causing exome variants. AbstractPrincipal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Compared with GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome-wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.
Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide single-nucleotide variant arrays (GWSA). We compared whole-exome sequencing (WES) and GWSA for this purpose. We analyzed 110 subjects originating from different regions of the world, including North Africa and the Middle East, which are poorly covered by public databases and have high consanguinity rates. We tested and applied a number of quality control (QC) filters. Comparedwith GWSA, we found that WES provided an accurate prediction of population substructure using variants with a minor allele frequency > 2% (correlation = 0.89 with the PCA coordinates obtained by GWSA). WES also yielded highly reliable estimates of homozygosity rates using runs of homozygosity with a 1,000-kb window (correlation = 0.94 with the estimates provided by GWSA). Finally, homozygosity mapping analyses in 15 families including a single offspring with high homozygosity rates showed that WES provided 51% less genome- wide linkage information than GWSA overall but 97% more information for the coding regions. At the genome-wide scale, 76.3% of linked regions were found by both GWSA and WES, 17.7% were found by GWSA only, and 6.0% were found by WES only. For coding regions, the corresponding percentages were 83.5%, 7.4%, and 9.1%, respectively. With appropriate QC filters, WES can be used for PCA and adjustment for population substructure, estimating homozygosity rates in individuals, and powerful linkage analyses, particularly in coding regions.
Author Cobat, Aurélie
Abhyankar, Avinash
Bousfiha, Aziz
Shang, Lei
Itan, Yuval
El Baghdadi, Jamila
Belkadi, Aziz
Casanova, Jean-Laurent
Abel, Laurent
Pedergnana, Vincent
Boisson, Bertrand
Vincent, Quentin B.
Alcais, Alexandre
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Copyright Volumes 1–89 and 106–113, copyright as a collective work only; author(s) retains copyright to individual articles
Copyright National Academy of Sciences Jun 14, 2016
Distributed under a Creative Commons Attribution 4.0 International License
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– notice: Copyright National Academy of Sciences Jun 14, 2016
– notice: Distributed under a Creative Commons Attribution 4.0 International License
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Keywords exome sequencing
linkage analysis
population structure
genotyping array
homozygosity mapping
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Author contributions: A. Belkadi, V.P., A.C., Y.I., A. Alcais, J.-L.C., and L.A. designed research; A. Belkadi, V.P., A.C., Y.I., Q.B.V., A. Abhyankar, L.S., J.E.B., A. Bousfiha, E./A.C., and B.B. performed research; A. Belkadi, V.P., A.C., Y.I., Q.B.V., A. Abhyankar, and B.B. contributed new reagents/analytic tools; A. Belkadi, V.P., A.C., Y.I., Q.B.V., A. Abhyankar, L.S., A. Alcais, B.B., J.-L.C., and L.A. analyzed data; A. Belkadi, V.P., A.C., Y.I., A. Alcais, J.-L.C., and L.A. wrote the paper; and J.E.B., A. Bousfiha, and E./A.C. provided clinical data.
Reviewers: L.B.B., Centre Hospitalo-Universitaire (CHU) Sainte-Justine/University of Montreal; and J.F., Ecole Polytechnique Fédérale de Lausanne (EPFL).
1A. Belkadi and V.P. contributed equally to this work.
Contributed by Jean-Laurent Casanova, April 27, 2016 (sent for review March 3, 2016; reviewed by Luis B. Barreiro and Jacques Fellay)
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Snippet Principal component analysis (PCA), homozygosity rate estimations, and linkage studies in humans are classically conducted through genome-wide...
We compared the information provided by whole-exome sequencing (WES) and genome-wide single-nucleotide variant arrays in terms of principal component analysis,...
Significance We compared the information provided by whole-exome sequencing (WES) and genome-wide single-nucleotide variant arrays in terms of principal...
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SubjectTerms Biological Sciences
Consanguinity
Female
Filters
Genetic Linkage
Genome-Wide Association Study
Genomes
Homozygosity
Homozygote
Humans
Inbreeding
Life Sciences
Male
Mapping
Middle East
North America
Offspring
Parents & parenting
Population structure
Principal components analysis
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Title Whole-exome sequencing to analyze population structure, parental inbreeding, and familial linkage
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