High Throughput Science - Genomic and metabolmic analysis of haemorrhagic in the China Kadoorie Biobank

Lead Research Organisation: University of Oxford

Abstract

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Technical Summary

Stroke is the second leading cause of death globally, with much less known about its genetic and non-genetic determinants than for other major diseases such as ischaemic heart disease (IHD). In the UK, although intracerebral haemorrhage (ICH) accounts for only 10-15% of stroke cases, it causes more than half of all stroke deaths, and much severe disability. In China, about 30% of incident cases of stroke are due to ICH and almost all suspected cases of stroke will have CT/MRI after admission to hospital, allowing reliable determination of stroke subtypes. Better understanding of genetic and non-genetic risk factors for stroke subtypes is essential for improved prediction and prevention, and the development of new therapies.
Twin studies and other family studies indicate a substantial genetic component to stroke risk, but there are to date no reports of well-powered GWAS studies of ICH. We will investigate the genetic contribution to ICH in a case-control study nested within the prospective China Kadoorie Biobank (CKB) study of 0.5 million people, which included extensive data by questionnaires and physical measurements and long-term storage of blood samples. In the CKB follow-up through linkage to death and disease registries and to the nationwide health insurance system on all hospitalised events has accumulated >20,000 first strokes. The GWAS will include 5,000 scan-confirmed incident cases of ICH and 10,000 controls, frequency-matched by area, age, sex, time of enrollment, etc. We will use a 800,000 SNP Affymetrix Axiom® myDesign® array, custom-designed to maximise whole-genome coverage in the Chinese population, enabling imputation of 6-10M SNPs and indels using relevant publically available reference panels. The 10,000 control subjects will also form a set of “common controls” for genotyping studies of other diseases (e.g. ischaemic stroke, IHD).
Genome-wide significant associations will be validated by direct genotyping, and up to 100 variants identified as putatively associated with stroke risk (e.g. P<10 6) will be prioritised for replication in additional incident cases from CKB and other cohorts from China and East Asia, together with in silico replication in imputed GWAS data from available ethnically diverse cohorts.
In future, we plan to supplement the genetic analysis of these 15,000 subjects with metabolomic measurements on blood plasma based on mass spectrometry and proton nuclear magnetic resonance spectroscopy, and standard blood biomarker assays. Using system biology approaches to combine these ‘-omics’ data with detailed environmental and lifestyle information, we aim ultimately to understand the molecular basis of haemorrhagic stroke.

Publications


10 25 50
 
Description Beijing Genomics Institute 
Organisation Beijing Genomics Institute (BGI)
Country China, People's Republic of 
Sector Academic/University 
PI Contribution CKB are working with BGI on various research projects including DNA extravtion and large-scale GWAS of 100,000 CKB samples. We are also collaboratiing with BGI's Research organisation on a Mitochondrial DNA Project. This Project will involve sequencing the mitochondrial genomes of up to 300 samples (up to 100 parent-offspring trios) from the China Kadoorie Biobank. These results can be used to assess the inheritance patterns of mitochondrial genomes, including the extent of heteroplasmy and paternal inheritance. Framework agreement for the above project and future research collaborations ( eg on Whole genome sequencing, methylation) currently being finalised.)
Collaborator Contribution BGI are providing the facilities and technical infrastructure for the conduct of genomic assays.
Impact n/a
Start Year 2015
 
Description GIANT: Genetic Investigation of ANthropometric Traits 
Organisation Broad Institute
Department The Genetic Investigation of ANthropometric Traits (GIANT)
Country United States of America 
Sector Academic/University 
PI Contribution CKB plans to share genomics data or contribute to GWAS meta analyses being conducted by this group.
Collaborator Contribution Access to additional GWAS data to increase the likelihood of novel significant findings.
Impact N/A
Start Year 2017
 
Description Global Lipids Genetics Consortium 
Organisation Global Lipids Genetic Consortium (GLGC)
Country United States of America 
Sector Charity/Non Profit 
PI Contribution CKB plans to share genomics data or contribute to GWAS meta analyses being conducted by this group.
Collaborator Contribution Access to additional GWAS data to increase the likelihood of novel significant findings.
Impact In progress
Start Year 2017
 
Description International Stroke Genetics Consortium 
Organisation Massachusetts General Hospital
Department International Stroke Genetics Consortium
Country United States of America 
Sector Charity/Non Profit 
PI Contribution CKB plans to share genomics data or contribute to GWAS meta-analyses being conducted by this group.
Collaborator Contribution Long-term collaboration. Access to additional GWAS data to increase the likelihood of novel significant findings.
Impact In Progress
Start Year 2016
 
Description Nanjing Medical University 
Organisation Nanjing Medical University
Country China, People's Republic of 
Sector Academic/University 
PI Contribution Joint academic collaboration investigating stroke genetics among a case-control study of CKB participants.
Collaborator Contribution Contributing research and analystical expertise. CKB/ Oxford currently hosting a post-doctoral researcher from Nanjing who is working on this project.
Impact Papers currentry being drafted.
Start Year 2015
 
Description Newton Fund_University of Leicester 
Organisation University of Leicester
Department Department of Health Sciences
Country United Kingdom of Great Britain & Northern Ireland (UK) 
Sector Academic/University 
PI Contribution CKB has included additional custom respiratory content into its array design and Prof Tobin will assist in examining this GWAs data alongside baseline and prospective datasets
Collaborator Contribution Ongoing long-term collaboration.
Impact Nature genetic papers (in Press) "Genome-wide association analyses for lung function and chronic obstructive pulmonary disease identify new loci and potential druggable targets"
Start Year 2015
 
Description ROHgen - (Runs of Homozygosity) 
Organisation ReproGen Consortium
Country Global 
Sector Academic/University 
PI Contribution CKB plans to share genomics data or contribute to GWAS meta analyses being conducted by this group.
Collaborator Contribution Access to additional GWAS data to increase the likelihood of novel significant findings.
Impact In progress
Start Year 2016
 
Description University of Oxford - OCDEM 
Organisation University of Oxford
Country United Kingdom of Great Britain & Northern Ireland (UK) 
Sector Academic/University 
PI Contribution Access to relevant CKB data including genomics data and diabetes outcome data. Paper drafting and internal genomics expertise and supervision.
Collaborator Contribution Provision of a post graduate research assistant working on the the identification and characterization of genetic variants that influence predisposition to type 2 diabetes and related traits.
Impact Already contributed several novel and interesting findings including piblished research papers
Start Year 2014
 
Description Wellcome Trust Centre for Human Genetics 
Organisation University of Oxford
Department Wellcome Trust Centre for Human Genetics
Country United Kingdom of Great Britain & Northern Ireland (UK) 
Sector Academic/University 
PI Contribution Collaborated in the design of a customised genotyping array for genomewide analysis, which is complementary to the UK Biobank array, and will facilitate future joint projects in the genomics of common diseases.
Collaborator Contribution Groups at the WTCHG will work closely with the CKB team in genome wide data imputation and analysis, for the current work on stroke, as well as future genomic projects, including the partial cohort-wide genotyping funded by the MRC-Newton fund.
Impact n/a
Start Year 2015
 
Description Coverage on study in Pharmaceutical industry trade journal 
Form Of Engagement Activity A magazine, newsletter or online publication
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Industry/Business
Results and Impact Some coverage of paper on LPa2 emphasising the implications for drug target discovery and pharmaceutical inductrial practice.

https://www.drugtargetreview.com/news/12376/prospective-biobank-studies/
Year(s) Of Engagement Activity 2016
URL http://www.drugtargetreview.com/news/12376/prospective-biobank-studies/
 
Description WuxiApp Tec, Shanghai, China 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Professional Practitioners
Results and Impact WuxiApp Tec, Shanghai, China
Year(s) Of Engagement Activity 2015,2016