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A pilot study of demographic and dopaminergic genetic contributions to weight change in kidney transplant recipients

Stanfill, A and Hathaway, D and Cashion, A and Homayouni, R and Cowan, P and Thompson, C and Madahian, B and Conley, Y (2015) A pilot study of demographic and dopaminergic genetic contributions to weight change in kidney transplant recipients. PLoS ONE, 10 (9).

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Kidney transplant recipients often experience a significant amount of weight gain in the first year post-transplantation. While demographic factors such as age, race, and sex have been associated with weight gain in this population, these factors do not explain all of the variability seen. A number of studies have suggested that genetics also plays a critical role in weight changes. Recently, alterations in the activity of the neurotransmitter dopamine have been associated with weight change, and gene expression studies in kidney transplant recipients have supported this association. The purpose of this pilot study is to first examine the feasibility and methodology, and then to examine the associations of age, race, sex, and genotype for 13 SNPs and 3 VNTRs in 9 dopaminergic pathway genes (ANKK1, DRD2, DRD3, DRD4, SLC6A3/DAT1, MAOA, MAOB, COMT, CPE) for associations with percent weight change at 12 months post-transplantation. Seventy kidney transplant recipients had demographic and clinical data collected as a part of a larger observational study. DNA was extracted from repository buffy coat samples taken at the time of transplant, and genotyped using Taqman and PCR based methods. Three SNPs were independently associated with percent weight change: ANKK1 rs1800497 (r = -0.28, p = 0.05), SLC6A3/DAT1 rs6347 (p = 0.046), and CPE rs1946816 (p = 0.028). Stepwise regression modelling confirmed the combined associations of age (p = 0.0021), DRD4 VNTR 4/5 genotype (p = 0.0074), and SLC6A3/DAT1 rs6347 CC genotype (p = 0.0009) and TT genotype (p = 0.0004) with percent weight change in a smaller sample (n = 35) of these kidney transplant recipients that had complete genotyping. These associations indicate that there may be a genetic, and an age component to weight changes post transplantation.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Stanfill, A
Hathaway, D
Cashion, A
Homayouni, R
Cowan, P
Thompson, C
Madahian, B
Conley, Yyconley@pitt.eduYCONLEY
ContributionContributors NameEmailPitt UsernameORCID
Date: 25 September 2015
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: PLoS ONE
Volume: 10
Number: 9
DOI or Unique Handle: 10.1371/journal.pone.0138885
Institution: University of Pittsburgh
Refereed: Yes
Date Deposited: 23 Aug 2016 14:39
Last Modified: 02 Feb 2019 14:56


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