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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Hum+Genet
2017 ; 100
(5
): 803-816
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High-Resolution Genetic Maps Identify Multiple Type 2 Diabetes Loci at Regulatory
Hotspots in African Americans and Europeans
#MMPMID28475862
Lau W
; Andrew T
; Maniatis N
Am J Hum Genet
2017[May]; 100
(5
): 803-816
PMID28475862
show ga
Interpretation of results from genome-wide association studies for T2D is
challenging. Only very few loci have been replicated in African ancestry
populations and the identification of the implicated functional genes remain
largely undefined. We used genetic maps that capture detailed linkage
disequilibrium information in European and African Americans and applied these to
large T2D case-control samples in order to estimate locations for putative
functional variants in both populations. Replicated T2D locations were tested for
evidence of being regulatory hotspots using adipose expression. We validated a
sample of our co-location intervals using next generation sequencing and
functional annotation, including enhancers, transcription, and chromatin
modifications. We identified 111 additional disease-susceptibility locations, 93
of which are cosmopolitan and 18 of which are European specific. We show that
many previously known signals are also risk loci in African Americans. The
majority of the disease locations appear to confer risk of T2D via the regulation
of expression levels for a large number (266) of cis-regulated genes, the
majority of which are not the nearest genes to the disease loci. Sequencing three
cosmopolitan locations provided candidate functional variants that precisely
co-locate with cell-specific chromatin domains and pancreatic islet enhancers.
These variants have large effect sizes and are common across populations. Results
show that disease-associated loci in different populations, gene expression, and
cell-specific regulatory annotation can be effectively integrated by localizing
these effects on high-resolution genetic maps. The cis-regulated genes provide
insights into the complex molecular pathways involved and can be used as targets
for sequencing and functional molecular studies.