Novel Linkage Peaks Discovered for Diabetic Nephropathy in Individuals With Type 1 Diabetes

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Finndiane Study Grp , Haukka , J , Sandholm , N , Valo , E , Forsblom , C , Harjutsalo , V , Cole , J B , McGurnaghan , S J , Colhoun , H M & Groop , P-H 2021 , ' Novel Linkage Peaks Discovered for Diabetic Nephropathy in Individuals With Type 1 Diabetes ' , Diabetes , vol. 70 , no. 4 , pp. 986-995 . https://doi.org/10.2337/db20-0158

Title: Novel Linkage Peaks Discovered for Diabetic Nephropathy in Individuals With Type 1 Diabetes
Author: Finndiane Study Grp; Haukka, Jani; Sandholm, Niina; Valo, Erkka; Forsblom, Carol; Harjutsalo, Valma; Cole, Joanne B.; McGurnaghan, Stuart J.; Colhoun, Helen M.; Groop, Per-Henrik
Contributor: University of Helsinki, HUS Abdominal Center
University of Helsinki, Clinicum
University of Helsinki, HUS Abdominal Center
University of Helsinki, Institute for Molecular Medicine Finland
University of Helsinki, Research Programs Unit
University of Helsinki, HUS Abdominal Center
Date: 2021-04
Number of pages: 10
Belongs to series: Diabetes
ISSN: 0012-1797
URI: http://hdl.handle.net/10138/329167
Abstract: Genome-wide association studies (GWAS) and linkage studies have had limited success in identifying genome-wide significantly linked regions or risk loci for diabetic nephropathy (DN) in individuals with type 1 diabetes (T1D). As GWAS cohorts have grown, they have also included more documented and undocumented familial relationships. Here we computationally inferred and manually curated pedigrees in a study cohort of >6,000 individuals with T1D and their relatives without diabetes. We performed a linkage study for 177 pedigrees consisting of 452 individuals with T1D and their relatives using a genome-wide genotyping array with >300,000 single nucleotide polymorphisms and PSEUDOMARKER software. Analysis resulted in genome-wide significant linkage peaks on eight chromosomal regions from five chromosomes (logarithm of odds score >3.3). The highest peak was localized at the HLA region on chromosome 6p, but whether the peak originated from T1D or DN remained ambiguous. Of other significant peaks, the chromosome 4p22 region was localized on top of ARHGAP24, a gene associated with focal segmental glomerulosclerosis, suggesting this gene may play a role in DN as well. Furthermore, rare variants have been associated with DN and chronic kidney disease near the 4q25 peak, localized on top of CCSER1.
Subject: 3121 General medicine, internal medicine and other clinical medicine
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