A Case-Sibling Assessment of the Association Between Skin Pigmentation and Other Vitamin D-related Factors and Type 1 Diabetes Mellitus
Date
2009
Authors
Ponsonby, Anne-Louise
Cameron, Fergus
Saffery, Richard
Pezic, Angela
Wong, Nick
Craig, Jeff
Ellis, Justine
Dwyer, Terence
Journal Title
Journal ISSN
Volume Title
Publisher
American Society of Photobiology
Abstract
Fair skin pigmentation has been associated with a higher risk of type 1 diabetes mellitus (T1DM). The aim is to compare children with T1DM directly to a sibling in relation to their skin pigmentation in sun-exposed and unexposed sites, past sun exposure and methylation of the VDR gene promoter. The sample consisted of children with T1DM attending a diabetes outpatient clinic and siblings (total n = 42). Cutaneous melanin density was estimated using a spectrophotometer. Parental report on past sun exposure was obtained. DNA methylation analysis of the VDR gene promoter was conducted. Matched data analysis was performed comparing each case directly to their sibling. Cases were significantly more likely to have lighter skin pigmentation at the upper arm (AOR 0.69 [95% CI: 0.52, 0.90]; P = 0.01). Low infant sun exposure was imprecisely associated with a two-fold increase in T1DM risk (AOR 2.43 [95% CI: 0.91, 6.51]; P = 0.08 for under 1 h of winter sun exposure per leisure day). The VDR gene promoter was completely unmethylated in both cases and siblings. The previously demonstrated association between light skin pigmentation and T1DM risk was evident even in this comparison across sibling pairs. Further work on past UVR exposure and related factors such as skin pigmentation is required.
Description
Keywords
Keywords: primer DNA; vitamin D; article; case control study; genetics; human; insulin dependent diabetes mellitus; nucleotide sequence; pathology; skin pigmentation; Base Sequence; Case-Control Studies; Diabetes Mellitus, Type 1; DNA Primers; Humans; Skin Pigmenta
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Source
Photochemistry and Photobiology
Type
Journal article
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2037-12-31