Quantitative trait locus (QTL) identification in a Croatian isolate
Lead Research Organisation:
University of Edinburgh
Abstract
The aim of this project is to identify genetic variants influencing susceptibility to common diseases. We are studying a large number of quantitatively varying traits (QTs) (>100 per person) in adult volunteers from isolated communities on the Dalmatian cost of Croatia. These communities have been studied for several decades by our Croatian collaborators. We then carry out whole genome association scans of the DNA samples from each individual using 320,000 genetic markers in order to identify susceptibility genes or regulatory variants. Positive associations are then replicated in other population samples.
Technical Summary
The aims of the study are, firstly, to genetically map and identify quantitative trait loci (QTL) influencing common human traits and disorders in isolated populations.
We have performed whole genome association analyses in samples obtained from an epidemiological field survey of 1,041 individuals from the island of Vis on the Dalmatian coast of Croatia and a similar number from the island of Korcula. Our Croatian collaborators are currently sampling volunteers from the city of Split on the Croatian mainland.
We propose to replicate and fine map the most significant QTL in other isolate and general population samples. Once this has been achieved, QTL will be identified by further genotyping and direct sequencing of candidate genes within each identified region.
In addition, we propose to estimate the genetic parameters and analyse the distributions of the >100 quantitative traits (QTs) analysed to date.
We are currently extending the field work by analysing further QTs (total of approximately 100) and harmonising the methods and choice of QTs with other members of the EUROSPAN FP6 consortium of isolate populations (Sweden, Netherlands, Croatia, Scotland, Italy).
We have carried out a 320,000 single nucleotide polymorphism (SNP) whole genome scan in 2,000 members from the Croatian isolate, to carry out a QT genetic association study.
We have performed whole genome association analyses in samples obtained from an epidemiological field survey of 1,041 individuals from the island of Vis on the Dalmatian coast of Croatia and a similar number from the island of Korcula. Our Croatian collaborators are currently sampling volunteers from the city of Split on the Croatian mainland.
We propose to replicate and fine map the most significant QTL in other isolate and general population samples. Once this has been achieved, QTL will be identified by further genotyping and direct sequencing of candidate genes within each identified region.
In addition, we propose to estimate the genetic parameters and analyse the distributions of the >100 quantitative traits (QTs) analysed to date.
We are currently extending the field work by analysing further QTs (total of approximately 100) and harmonising the methods and choice of QTs with other members of the EUROSPAN FP6 consortium of isolate populations (Sweden, Netherlands, Croatia, Scotland, Italy).
We have carried out a 320,000 single nucleotide polymorphism (SNP) whole genome scan in 2,000 members from the Croatian isolate, to carry out a QT genetic association study.
Organisations
- University of Edinburgh, United Kingdom (Collaboration, Lead Research Organisation)
- Global Lipids Genetic Consortium (GLGC) (Collaboration)
- ReproGen Consortium (Collaboration)
- CKDGen Consortium (Collaboration)
- Global Urate Genetics Consortium (GUGC) (Collaboration)
- High Glycans (Collaboration)
- Regeneron Pharmaceuticals, Inc. (Collaboration)
- Broad Institute (Collaboration)
- Consortium for Refractive Error and Myopia (Collaboration)
- Generation Scotland (Collaboration)
- MaGIC (Collaboration)
- European Consortium of Urinary Traits (Collaboration)
- Cohorts for Heart and Aging Research in Genomic Epidemiology Consortium (CHARGE) (Collaboration)
- Diabetes Genetics Replication and Meta-Analysis (DIAGRAM) Consortium (Collaboration)
- SpiroMeta Consortium (Collaboration)
- International Consortia of Blood Pressure (ICBP-GWAS) (Collaboration)
- European Commission, Belgium (Collaboration)
- Cortisol Network (CORNET) (Collaboration)
Publications
Teumer A
(2016)
Genome-wide Association Studies Identify Genetic Loci Associated With Albuminuria in Diabetes.
in Diabetes
Kolcic I
(2016)
Mediterranean diet in the southern Croatia - does it still exist?
in Croatian medical journal
Ehret GB
(2016)
The genetics of blood pressure regulation and its target organs from association studies in 342,415 individuals.
in Nature genetics
Van Leeuwen EM
(2016)
Meta-analysis of 49 549 individuals imputed with the 1000 Genomes Project reveals an exonic damaging variant in ANGPTL4 determining fasting TG levels.
in Journal of medical genetics
Fan Q
(2016)
Meta-analysis of gene-environment-wide association scans accounting for education level identifies additional loci for refractive error.
in Nature communications
Hagenaars SP
(2016)
Polygenic risk for coronary artery disease is associated with cognitive ability in older adults.
in International journal of epidemiology
Lu Y
(2016)
New loci for body fat percentage reveal link between adiposity and cardiometabolic disease risk.
in Nature communications
Eicher JD
(2016)
Platelet-Related Variants Identified by Exomechip Meta-analysis in 157,293 Individuals.
in American journal of human genetics
Van Den Berg SM
(2016)
Meta-analysis of Genome-Wide Association Studies for Extraversion: Findings from the Genetics of Personality Consortium.
in Behavior genetics
Yaghootkar H
(2016)
Genetic Evidence for a Link Between Favorable Adiposity and Lower Risk of Type 2 Diabetes, Hypertension, and Heart Disease.
in Diabetes
Pattaro C
(2016)
Genetic associations at 53 loci highlight cell types and biological pathways relevant for kidney function.
in Nature communications
Jeroncic A
(2016)
Whole-exome sequencing in an isolated population from the Dalmatian island of Vis.
in European journal of human genetics : EJHG
Davies G
(2016)
Genome-wide association study of cognitive functions and educational attainment in UK Biobank (N=112 151).
in Molecular psychiatry
Schumann G
(2016)
KLB is associated with alcohol drinking, and its gene product ß-Klotho is necessary for FGF21 regulation of alcohol preference.
in Proceedings of the National Academy of Sciences of the United States of America
Jakobsdottir J
(2016)
Rare Functional Variant in TM2D3 is Associated with Late-Onset Alzheimer's Disease.
in PLoS genetics
Ried JS
(2016)
A principal component meta-analysis on multiple anthropometric traits identifies novel loci for body shape.
in Nature communications
Jones SE
(2016)
Genome-Wide Association Analyses in 128,266 Individuals Identifies New Morningness and Sleep Duration Loci.
in PLoS genetics
Ibrahim-Verbaas CA
(2016)
GWAS for executive function and processing speed suggests involvement of the CADM2 gene.
in Molecular psychiatry
Clarke TK
(2016)
Polygenic risk for alcohol dependence associates with alcohol consumption, cognitive function and social deprivation in a population-based cohort.
in Addiction biology
Tideman JW
(2016)
When do myopia genes have their effect? Comparison of genetic risks between children and adults.
in Genetic epidemiology
Chami N
(2016)
Exome Genotyping Identifies Pleiotropic Variants Associated with Red Blood Cell Traits.
in American journal of human genetics
Okbay A
(2016)
Genome-wide association study identifies 74 loci associated with educational attainment.
in Nature
| Description | DATA TRANSFER AND PERMITTED USE AGREEMENT |
| Amount | £101,520 (GBP) |
| Organisation | Pfizer Inc |
| Sector | Private |
| Country | United States |
| Start | 11/2014 |
| End | 06/2015 |
| Title | Stable LCLs with targeted shRNA to IL6ST and IKZF1 |
| Description | Lymphoblastoid cell line MATAT6 was chosen from a range of such lines previously generated at MRC HGU, for high level of IgG secretion. The genes encoding the interleukin-6 signal transducer (IL6ST) and IKZF1, encoding the transcription factor Ikaros-1, have been successfully targeted by multiple shRNAs, resulting in significant reductions (30-80%) in gene expression in six independent stable lines. Functional consequences are under investigation. |
| Type Of Material | Cell line |
| Provided To Others? | No |
| Impact | No impact as yet, but it is anticipated the research tool will be an important part of a forthcoming peer-reviewed research paper, and will be made available to other research groups on request, following publication. |
| Description | CCACE |
| Organisation | University of Edinburgh |
| Department | MRC Centre for Cognitive Ageing and Cognitive Epidemiology |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | The general cognitive ability (g) factor is strongly correlated with the other cognitive traits examined and shows high heritability. It is strongly predictive of many health related outcomes, including cognitive decline, dementia, cardiovascular disease and age at death and is a major focus of the current genome-wide association analyses being carried out in collaboration between the QTL and CCACE research groups. |
| Collaborator Contribution | Participants in the CROATIA cohorts, the Viking Health Study and the Generation Scotland Scottish Family Health Study have undergone a range of tests, including detailed testing for cognitive traits using the same validated methods. These tests were led by the partners at CCACE who are experts in these phenotypic measures. |
| Impact | Not multi-disciplinary. PubMed ID 17601350, 19290744, 18946731, 19077176, 25201988, 24944428, 24828478, 24573858, 24554214, 23722424, 22628180 |
| Start Year | 2006 |
| Description | CHARGE |
| Organisation | Cohorts for Heart and Aging Research in Genomic Epidemiology Consortium (CHARGE) |
| Country | Global |
| Sector | Academic/University |
| PI Contribution | The MRC HGU QTL group, particularly through Caroline Hayward and Jenny Huffman, has a long-standing collaboration with CHARGE with data from the isolates cohorts contributing to a wide range of Phenotype Working Groups, and more recently data from Generation Scotland has also been included in the collaboration. |
| Collaborator Contribution | The CHARGE Consortium was formed to facilitate genome-wide association study meta-analyses and replication opportunities among multiple large and well-phenotyped longitudinal cohort studies. CHARGE has provided statistical and analytical methods development and facilitated the publication of many high impact papers. |
| Impact | PubMed ID 22589738, 22199011, 22001757, 21502573, 24068962, 23583979 |
| Start Year | 2009 |
| Description | CKDgen |
| Organisation | CKDGen Consortium |
| Country | Global |
| Sector | Academic/University |
| PI Contribution | Genotype and phenotype data relevant to chronic kidney disease. |
| Collaborator Contribution | Analysis plans and meta-analysis. |
| Impact | PubMed ID 22962313, 22797727, 22479191, 22492995, 24029420 |
| Start Year | 2008 |
| Description | CORNET |
| Organisation | Cortisol Network (CORNET) |
| Country | United Kingdom |
| Sector | Charity/Non Profit |
| PI Contribution | Samples of plasma for cortisol measurement, together with genome-wide genotype data and analytical expertise and project management. |
| Collaborator Contribution | Expertise in analytical measurements and additional genotypes for meta-analyses. |
| Impact | Functional work on-going plus manuscript in preparation. Not multi-disciplinary. PubMed ID 23636447 |
| Start Year | 2009 |
| Description | Consortium for Refractive Error & Myopia (CREAM) |
| Organisation | Consortium for Refractive Error and Myopia |
| Country | Singapore |
| Sector | Charity/Non Profit |
| PI Contribution | Contribution of detailed eye-related phenotype and genome-wide genotype data to meta-analyses by the CREAM consortium. |
| Collaborator Contribution | Analysis plans and meta-analysis across a range of cohorts. |
| Impact | Not multi-disciplinary. PubMed ID 22665138, 23474815, 23396134, 24144296, |
| Start Year | 2012 |
| Description | DIAGRAM |
| Organisation | Diabetes Genetics Replication and Meta-Analysis (DIAGRAM) Consortium |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | Genome-wide genotype data and diabetes-related phenotype data on a variety of isolate cohorts. |
| Collaborator Contribution | Analysis and meta-analysis methods. |
| Impact | PubMed ID |
| Start Year | 2008 |
| Description | ECUT |
| Organisation | European Consortium of Urinary Traits |
| Country | European Union (EU) |
| Sector | Charity/Non Profit |
| PI Contribution | Urine samples from participants in isolate and general population cohorts for detailed laboratory analysis of a range of phenotypic measures relevant to kidney function. |
| Collaborator Contribution | Expertise in high-throughput analytical methods for analysis of urine samples, data from other cohorts and prediction of functional consequences. |
| Impact | PMID: 24578125, 29093028, 28586769, 27915449, 26966016 |
| Start Year | 2010 |
| Description | GIANT |
| Organisation | Broad Institute |
| Department | The Genetic Investigation of ANthropometric Traits (GIANT) |
| Country | United States |
| Sector | Academic/University |
| PI Contribution | Genome-wide genotype and many anthropometric trait measures from a range of cohorts. |
| Collaborator Contribution | Development of analysis plans and new software and methodologies for genetic analyses. |
| Impact | PubMed ID |
| Start Year | 2008 |
| Description | GUGC |
| Organisation | Global Urate Genetics Consortium (GUGC) |
| Country | Global |
| Sector | Charity/Non Profit |
| PI Contribution | Genome-wide genotype and detailed phenotypic data relevant to the study of gout. |
| Collaborator Contribution | Analysis plans and meta-analyses. |
| Impact | Not multi-disciplinary. PubMed ID 23263486 |
| Start Year | 2008 |
| Description | Generation Scotland |
| Organisation | Generation Scotland |
| Country | United Kingdom |
| Sector | Charity/Non Profit |
| PI Contribution | To date in this collaboration, DNA from 14,000 GS:SFHS participants has been analysed by high density genome-wide chip genotyping. These results are being compared with those in published meta-analyses and the genome-wide data are being used by the QTL group in a range of research projects involving both international consortia and local experts. Our research team has recently been asked by the Generation Scotland Executive to form an Expert Working Group" in Genome-Wide Genetic Analysis. It has the remit to undertake and quality assure work on the GS:SFHS genome-wide genotype and its subsequent analysis and accessibility. |
| Collaborator Contribution | The Generation Scotland Scottish Family Health Study (GS:SFHS) is a family-based genetic epidemiology cohort with DNA, other biological samples (serum, urine and cryopreserved whole blood) and socio-demographic and clinical data from approximately 24,000 volunteers, aged 18-98 years, in ~7,000 family groups. GS has been made possible through a unique partnership between the Scottish people, the NHS in Scotland and the Scottish University Medical Schools. Generation Scotland operates as a biobank and provided phenotype data and DNA samples for genome-wide analyses by the QTL group. |
| Impact | PMID: 23521772 PMID: 25293386 PMID: 24944428 PMID: 24554214 PMID: 25078964 PMID: 24929828 |
| Start Year | 2012 |
| Description | Global Lipids Genetic Consortium |
| Organisation | Global Lipids Genetic Consortium (GLGC) |
| Country | United States |
| Sector | Charity/Non Profit |
| PI Contribution | Genome-wide genotype and data generated by the EUROSPAN consortium, together with phenotype data relevant to the study of lipids. |
| Collaborator Contribution | Analysis plans, methods and meta-analyses. |
| Impact | PubMed ID 22359512 |
| Start Year | 2011 |
| Description | High Glycans |
| Organisation | High Glycans |
| Country | Netherlands |
| Sector | Private |
| PI Contribution | Contributing plasma samples for analysis of glycans on a variety of different platforms. Performing meta-analysis of the output data. |
| Collaborator Contribution | Quantifying glycan profiles in samples provided and returning data to the MRC HGU team. |
| Impact | PubMed ID 22395466, 23274891, 24012618, 23382691, 21908519 |
| Start Year | 2011 |
| Description | ICBP |
| Organisation | International Consortia of Blood Pressure (ICBP-GWAS) |
| Country | United States |
| Sector | Academic/University |
| PI Contribution | Genome-wide and imputed genotype data and detailed phenotype data relating to blood pressure. |
| Collaborator Contribution | Analysis plans and meta-analyses. |
| Impact | PubMed ID 21909115 |
| Start Year | 2009 |
| Description | MAGIC |
| Organisation | MAGIC |
| Country | United Kingdom |
| Sector | Public |
| PI Contribution | Genotype and phenotype relating to insulin and glucose measures and related traits. |
| Collaborator Contribution | Analysis plans and meta-analysis. |
| Impact | PubMed ID 21962509, 22885924, 22581228 |
| Start Year | 2008 |
| Description | MIMOMICS |
| Organisation | European Commission |
| Department | Seventh Framework Programme (FP7) |
| Country | European Union (EU) |
| Sector | Public |
| PI Contribution | Phenotype and genotype data for glycomics and lipidomics on isolates cohorts in support of the development of new analysis methods. |
| Collaborator Contribution | Developing novel analysis methods using bioinformatics and other high throughput technologies. |
| Impact | No outputs yet |
| Start Year | 2013 |
| Description | NMR Metabolomics in Isolate Cohorts |
| Organisation | University of Edinburgh |
| Department | Usher Institute of Population Health Sciences and Informatics |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | All fieldwork for sample collection and phenotyping, DNA extraction, genotyping and QC, transfer of samples for analysis. |
| Collaborator Contribution | Funding provided in kind through a British Council Award for analysis of additional samples from isolate populations |
| Impact | No outputs yet |
| Start Year | 2017 |
| Description | Regeneron Exome Sequencing |
| Organisation | Regeneron Pharmaceuticals, Inc. |
| Country | United States |
| Sector | Private |
| PI Contribution | All fieldwork to collect samples and data, preparation of data dictionaries, pedigree verification, provision of purified DNA for sequencing. Analysis of the resulting exome sequencing data will be a collaboration involving both researchers from the QTL Group and from Regeneron. |
| Collaborator Contribution | Library preparation and exome sequencing of approximately 9,000 DNA samples. |
| Impact | No outcomes yet. |
| Start Year | 2017 |
| Description | Reprogen |
| Organisation | ReproGen Consortium |
| Country | Global |
| Sector | Academic/University |
| PI Contribution | Contribution of genome-wide genetic and detailed phenotype data relevant to reproductive health. |
| Collaborator Contribution | Analysis plans and meta-analysis. |
| Impact | Not multi-disciplinary. PubMed IDs 22267201 |
| Start Year | 2010 |
| Description | Spirometa |
| Organisation | SpiroMeta Consortium |
| Country | Global |
| Sector | Academic/University |
| PI Contribution | Contribution of lung function phenotype and genome-wide genotype data to the Consortium. |
| Collaborator Contribution | Analytical project plans and meta-analyses. Expertise in the lung function phenotype. |
| Impact | Not multi-disciplinary. PMID: 24929828, 30804561, 30175238, 28082375, 26404118, 26395457, 21625484, 20010834 |
| Start Year | 2008 |
| Title | Biomarkers for Pain |
| Description | A Data Use Licence was signed by MRCT with the University of Dundee, for the provision of data on genetic biomarkers associated with pain. These data were generated through MRC funding for the QTL Programme ie this award. |
| IP Reference | |
| Protection | Protection not required |
| Year Protection Granted | 2014 |
| Licensed | Yes |
| Impact | Research paper published (McIntosh et al, PLoS Medicine 2016, PMID 27529168) |
| Description | ? Presentations of the FAS Passive Surveillance Study 2010-2014 and The Ayrshire and Arran Pilot Project, to the Fourth European Conference on FASD September 12-15th at the Royal Holloway, University of London (Organised by the European FASD Alliance (www.eufasd.org) |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Professional Practitioners |
| Results and Impact | Presentations of the FAS Passive Surveillance Study 2010-2014 and The Ayrshire and Arran Pilot Project, to the Fourth European Conference on FASD September 12-15th at the Royal Holloway, University of London (Organised by the European FASD Alliance (www.eufasd.org) |
| Year(s) Of Engagement Activity | 2016 |
| Description | Farr Institute Case Study |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Public/other audiences |
| Results and Impact | The activity was preparation and publishing a case study on the Farr Institute website, part of the series "100 ways of using data to make lives better" |
| Year(s) Of Engagement Activity | 2016 |
| URL | http://www.farrinstitute.org/public-engagement-involvement/100-ways-of-using-data-to-make-lives-bett... |
| Description | Fieldwork Consultancy |
| Form Of Engagement Activity | A formal working group, expert panel or dialogue |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Professional Practitioners |
| Results and Impact | Consultancy on fieldwork and sample handling standard operating procedures, provided by Dr Caroline Hayward to the World health organisation |
| Year(s) Of Engagement Activity | 2013,2014 |
| Description | Genetic Ancestry Testing |
| Form Of Engagement Activity | A formal working group, expert panel or dialogue |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Policymakers/politicians |
| Results and Impact | Prof Jim Wilson is a member of the American Society of Human Genetics Round Table on Genetic Ancestry Testing, white paper in preparation. |
| Year(s) Of Engagement Activity | 2016,2017 |
| Description | IGMM Open Day |
| Form Of Engagement Activity | Participation in an open day or visit at my research institution |
| Part Of Official Scheme? | No |
| Geographic Reach | Regional |
| Primary Audience | Public/other audiences |
| Results and Impact | The IGMM Open Day was part of the Edinburgh Doors Open Day event and attracted over 200 visitors. A range of activities was offered, including a poster about the work of the QTL Group |
| Year(s) Of Engagement Activity | 2017 |
| URL | https://www.ed.ac.uk/igmm/news-and-events/news-2017/over-200-visitors-igmm-open-day |
| Description | MRC Festival of Medical Research |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | Regional |
| Primary Audience | Public/other audiences |
| Results and Impact | As part of the MRC Festival of Medical Research, the MRC Institute of Genetics and Molecular Medicine organised a day of hands-on activities at Ocean Terminal, one of Europe's largest shopping and leisure centres. Shoppers were engaged with the DNA research happening at the Institute, through colourful hands-on activities, thought-provoking conversation and presentation of posters, under the overall theme of "People-powered DNA Research". |
| Year(s) Of Engagement Activity | 2017 |
| URL | https://www.ed.ac.uk/igmm/news-and-events/news-2017/people-powered-dna-research |