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Brugger M, Lutz M, Müller-Nurasyid M, Lichtner P, Slater EP, Matthäi E, Bartsch DK, Strauch K. Joint Linkage and Association Analysis Using GENEHUNTER-MODSCORE with an Application to Familial Pancreatic Cancer. Hum Hered 2024; 89:8-31. [PMID: 38198765 DOI: 10.1159/000535840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 12/07/2023] [Indexed: 01/12/2024] Open
Abstract
INTRODUCTION Joint linkage and association (JLA) analysis combines two disease gene mapping strategies: linkage information contained in families and association information contained in populations. Such a JLA analysis can increase mapping power, especially when the evidence for both linkage and association is low to moderate. Similarly, an association analysis based on haplotypes instead of single markers can increase mapping power when the association pattern is complex. METHODS In this paper, we present an extension to the GENEHUNTER-MODSCORE software package that enables a JLA analysis based on haplotypes and uses information from arbitrary pedigree types and unrelated individuals. Our new JLA method is an extension of the MOD score approach for linkage analysis, which allows the estimation of trait-model and linkage disequilibrium (LD) parameters, i.e., penetrance, disease-allele frequency, and haplotype frequencies. LD is modeled between alleles at a single diallelic disease locus and up to three diallelic test markers. Linkage information is contributed by additional multi-allelic flanking markers. We investigated the statistical properties of our JLA implementation using extensive simulations, and we compared our approach to another commonly used single-marker JLA test. To demonstrate the applicability of our new method in practice, we analyzed pedigree data from the German National Case Collection for Familial Pancreatic Cancer (FaPaCa). RESULTS Based on the simulated data, we demonstrated the validity of our JLA-MOD score analysis implementation and identified scenarios in which haplotype-based tests outperformed the single-marker test. The estimated trait-model and LD parameters were in good accordance with the simulated values. Our method outperformed another commonly used JLA single-marker test when the LD pattern was complex. The exploratory analysis of the FaPaCa families led to the identification of a promising genetic region on chromosome 22q13.33, which can serve as a starting point for future mutation analysis and molecular research in pancreatic cancer. CONCLUSION Our newly proposed JLA-MOD score method proves to be a valuable gene mapping and characterization tool, especially when either linkage or association information alone provide insufficient power to identify the disease-causing genetic variants.
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Affiliation(s)
- Markus Brugger
- Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center, Johannes Gutenberg University, Mainz, Germany
- Institute of Medical Information Processing, Biometry and Epidemiology - IBE, LMU Munich, Munich, Germany
- Institute of Genetic Epidemiology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Manuel Lutz
- Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center, Johannes Gutenberg University, Mainz, Germany
- Institute of Medical Information Processing, Biometry and Epidemiology - IBE, LMU Munich, Munich, Germany
- Institute of Genetic Epidemiology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Martina Müller-Nurasyid
- Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center, Johannes Gutenberg University, Mainz, Germany
- Institute of Medical Information Processing, Biometry and Epidemiology - IBE, LMU Munich, Munich, Germany
- Institute of Genetic Epidemiology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Peter Lichtner
- Institute of Human Genetics, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Emily P Slater
- Department of Visceral, Thoracic and Vascular Surgery, Philipps University, Marburg, Germany
| | - Elvira Matthäi
- Department of Visceral, Thoracic and Vascular Surgery, Philipps University, Marburg, Germany
| | - Detlef K Bartsch
- Department of Visceral, Thoracic and Vascular Surgery, Philipps University, Marburg, Germany
| | - Konstantin Strauch
- Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center, Johannes Gutenberg University, Mainz, Germany
- Institute of Medical Information Processing, Biometry and Epidemiology - IBE, LMU Munich, Munich, Germany
- Institute of Genetic Epidemiology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
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Hasstedt SJ, Coon H, Xin Y, Adams TD, Hunt SC. APOH interacts with FTO to predispose to healthy thinness. Hum Genet 2015; 135:201-7. [PMID: 26711810 DOI: 10.1007/s00439-015-1629-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 12/18/2015] [Indexed: 01/17/2023]
Abstract
We identified eight candidate thinness predisposition variants from the Illumina HumanExome chip genotyped on members of pedigrees selected for either healthy thinness or severe obesity. For validation, we tested the candidates for association with healthy thinness in additional pedigree members while accounting for effects of obesity-associated genes: NPFFR2, NPY2R, FTO, and MC4R. Significance was obtained for the interaction of FTO rs9939609 with APOH missense variant rs52797880 (minor allele frequency 0.054). The thinness odds ratio was estimated as 2.15 (p < 0.05) for the combination of APOH heterozygote with the homozygote for the non-obesity FTO allele. Significance was not obtained for any other combination of a candidate variant with an obesity gene or for any of the eight candidates tested independently.
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Affiliation(s)
- Sandra J Hasstedt
- Department of Human Genetics, University of Utah School of Medicine, 15 N 2030 E, Salt Lake City, UT, 84112-5330, USA.
| | - Hilary Coon
- Department of Psychiatry, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Yuanpei Xin
- Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Ted D Adams
- Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Steven C Hunt
- Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT, USA.,Department of Genetic Medicine, Weill Cornell Medical College, Doha, Qatar
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Hasstedt SJ, Xin Y, Mao R, Lewis T, Adams TD, Hunt SC. A Copy Number Variant on Chromosome 20q13.3 Implicated in Thinness and Severe Obesity. J Obes 2015; 2015:623431. [PMID: 26881067 PMCID: PMC4736014 DOI: 10.1155/2015/623431] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 12/20/2015] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND/OBJECTIVES To identify copy number variants (CNVs) which are associated with body mass index (BMI). SUBJECTS/METHODS CNVs were identified using array comparative genomic hybridization (aCGH) on members of pedigrees ascertained through severely obese (BMI ≥ 35 kg/m(2)) sib pairs (86 pedigrees) and thin (BMI ≤ 23 kg/m(2)) probands (3 pedigrees). Association was inferred through pleiotropy of BMI with CNV log2 intensity ratio. RESULTS A 77-kilobase CNV on chromosome 20q13.3, confirmed by real-time qPCR, exhibited deletions in the obese subjects and duplications in the thin subjects (P = 2.2 × 10(-6)). Further support for the presence of a deletion derived from inference by likelihood analysis of null alleles for SNPs residing in the region. CONCLUSIONS One or more of 7 genes residing in a chromosome 20q13.3 CNV region appears to influence BMI. The strongest candidate is ARFRP1, which affects glucose metabolism in mice.
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Affiliation(s)
- Sandra J. Hasstedt
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
- *Sandra J. Hasstedt:
| | - Yuanpei Xin
- Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - Rong Mao
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
| | - Tracey Lewis
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
| | - Ted D. Adams
- Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - Steven C. Hunt
- Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
- Department of Genetic Medicine, Weill Cornell Medical College in Qatar, Doha, Qatar
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Hasstedt SJ, Highland HM, Elbein SC, Hanis CL, Das SK. Five linkage regions each harbor multiple type 2 diabetes genes in the African American subset of the GENNID Study. J Hum Genet 2013; 58:378-83. [PMID: 23552671 PMCID: PMC3692593 DOI: 10.1038/jhg.2013.21] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We previously localized type 2 diabetes (T2D)-susceptibility genes to five chromosomal regions through a genome-wide linkage scan of T2D and age of diagnosis (AOD) in the African American subset of the GENNID sample. To follow up these findings, we repeated the linkage and association analysis using genotypes on an additional 9203 fine-mapping single nucleotide polymorphisms (SNPs) selected to tag genes under the linkage peaks. In each of the five regions, we confirmed linkage and inferred the presence of ≥2 susceptibility genes. The evidence of multiple susceptibility genes consisted of: (1) multiple linkage peaks in four of the five regions; and (2) association of T2D and AOD with SNPs within ≥2 genes in every region. The associated genes included 3 previously reported to associate with T2D or related traits (GRB10, NEDD4L, LIPG) and 24 novel candidate genes, including genes in lipid metabolism (ACOXL) and cell-cell and cell-matrix adhesion (MAGI2, CLDN4, CTNNA2).
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Affiliation(s)
- Sandra J Hasstedt
- Department of Human Genetics, University of Utah, Salt Lake City, UT 84112 5330, USA.
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Vossen CY, Koeleman BP, Hasstedt SJ, Nijman IJ, Renkens IJ, Callas PW, Rosendaal FR, Bovill EG. Genetic variants associated with protein C levels. J Thromb Haemost 2013; 11:715-23. [PMID: 23387557 PMCID: PMC3631611 DOI: 10.1111/jth.12157] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/30/2013] [Indexed: 11/27/2022]
Abstract
BACKGROUND Normal protein C (PC) plasma levels range widely in the general population. Factors influencing normal PC levels are thought to influence the risk of venous thrombosis. Little is known about the underlying genetic variants. OBJECTIVES We performed a genome scan of normal PC levels to identify genes that regulate normal PC levels. PATIENTS/METHODS We performed a variance components linkage analysis for normal PC levels in 275 individuals from a single, large family. We then sequenced candidate genes under the identified linkage peak in eight family members: four with high and four with low, but normal, PC levels. For variants showing a difference in carriers between those with high and low PC levels, we re-evaluated linkage in the 275 family members conditional on the measured genotype effect. Genotype-specific mean PC levels were determined using likelihood analysis. Findings were replicated in the Leiden Thrombophilia Study (LETS). RESULTS We identified a quantitative trait locus at chromosome 5q14.1 affecting normal PC plasma level variability. Next-generation sequencing of 113 candidate genes under the linkage peak revealed four SNPs in BHMT2, ACOT12, SSBP2 and XRCC4, which significantly increased PC levels in our thrombophilic family, but not in LETS. CONCLUSIONS We identified four genes at chromosome 5q14.1 that might influence normal PC levels. BHMT2 seems the most likely candidate to regulate PC levels via homocysteine, a competitive inhibitor to thrombin. Failure to replicate our findings in LETS might be due to differences between the studies in genetic background and linkage disequilibrium patterns.
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Affiliation(s)
- C Y Vossen
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands
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