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Retrospective Cohort Study on Genetic Susceptibility of Lead Exposure using Stored Blood in Specimen Bank-Focused Newly employed workers  

Kim, Nam-Soo (Institute of Industrial Medicine, Soonchunhyang University)
Kim, Jin-Ho (Institute of Industrial Medicine, Soonchunhyang University)
Lee, Kap-Soo (Institute of Industrial Medicine, Soonchunhyang University)
Lee, Sung-Soo (Institute of Industrial Medicine, Soonchunhyang University)
Kim, Hwa-Sung (Institute of Industrial Medicine, Soonchunhyang University)
Ahn, Kyu-Dong (Institute of Industrial Medicine, Soonchunhyang University)
Schwartz, Brian S. (Department of Epidemiology, Johns Hopkins School of Hygiene and Public Health)
Lee, Byung-Kook (Institute of Industrial Medicine, Soonchunhyang University)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.16, no.2, 2006 , pp. 152-160 More about this Journal
Abstract
Genotype of ALAD and VDR yields two alleles, respectively and it has been implicated in susceptibility to lead toxicity. Also genotype known to variety by race. To evaluate the genetic susceptibility of ALAD and VDR gene on health effect of lead exposure, this study was done with new workers who entered lead industries from 1992 to 2001. Among database of lead industries of Soonchunhyang University Institute of Industrial Medicine, only new workers were selected for this study. The total of eligible workers for this category was 3,540 workers including non lead exposed workers of same lead industries. Genotype of ALAD and VDR were measured from stored blood in specimen bank of Soonchunhyang University, blood lead and other relevant information were obtained from database of each workers which were gathered at their first year of employment. Among 3,540 new employed study subjects during period of 1992-2001, 3204 workers(90.5%) had ALAD genotype 1-1; whereas 336 workers(9.5%) had variant type of ALAD (1-2 or 2-2). Lead exposed workers, 9.8%(n=243) male and 8.1%(n=16) female were heterozygous for the ALAD allele. Also non lead exposed workers, 8.9%(n=67) male and 9.3%(n=10) female were heterozygous for the ALAD allele. For VDR genotype, 2,903 workers(89.7%) out of total tested 3,238 workers were belonged to type bb and 335 workers(10.3%) were type bB or BB. Lead exposed workers, 10.4%(n=235) male and 12.2%(n=24) female were heterozygous for the VDR allele. Also non lead exposed workers, 9.2%(n=64) male and 12.5%(n=12) female were heterozygous for the VDR allele. No significant differences were seen in mean blood lead levels by ALAD and VDR genotype, nor was significantly associated with blood lead except age in multiple regression analysis.
Keywords
Specimen bank; Lead exposure; ALAD; VDR;
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