COL1A2 gene polymorphisms (Pvu II and Rsa I), serum calciotropic hormone levels, and dental fluorosis.
OBJECTIVE
To investigate the relationship between dental fluorosis, polymorphisms in the COL1A2 gene, and serum calciotropic hormone levels.


METHODS
We conducted a case-control study among children between 8 and 12 years of age with (n = 75) and without (n = 165) dental fluorosis in two counties in Henan Province, China. The PvuII and RsaI polymorphisms in the COL1A2 gene were genotyped using the PCR-RFLP procedure. Calcitonin and osteocalcin levels in the serum were measured using radioimmunassays.


RESULTS
Children carrying the homozygous genotype PP of COL1A2 PvuII had a significantly increased risk of dental fluorosis (OR =4.85, 95% CI: 1.22-19.32) compared to children carrying the homozygous genotype pp in an endemic fluorosis village (EFV). However, the risk (OR = 1.07, 95% CI: 0.45-2.52) was not elevated when the control population was recruited from a non-endemic fluorosis village. Additionally, fluoride levels in urine and osteocalcin levels in serum were found to be significantly lower in controls from non-endemic villages compared to cases. However, the differences in fluoride and osteocalcin levels were not observed when cases were compared to a control population from endemic fluorosis villages.


CONCLUSIONS
This study provides the first evidence of an association between polymorphisms in the COL1A2 gene with dental fluorosis in high fluoride exposed populations. Future studies are needed to confirm the association.
Huang
Hui
H
Department of Environmental Health, Zhengzhou University School of Public Health, Zhengzhou, China.
Ba
Yue
Y
Cui
Liuxin
L
Cheng
Xuemin
X
Zhu
Jingyuan
J
Zhang
Yuling
Y
Yan
Pingping
P
Zhu
Cairong
C
Kilfoy
Briseis
B
Zhang
Yawei
Y
D002116:Calcitonin / Q000097:blood; D016022:Case-Control Studies; D002648:Child; D002681:China / Q000453:epidemiology; D003094:Collagen / Q000235:genetics*; D024042:Collagen Type I; D015257:DNA-Cytosine Methylases; D015252:Deoxyribonucleases, Type II Site-Specific; D005260:Female; D009050:Fluorosis, Dental / Q000097:blood / Q000453:epidemiology / Q000235:genetics*; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D006801:Humans; D016015:Logistic Models; D008297:Male; D015675:Osteocalcin / Q000097:blood; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide; D011347:Procollagen / Q000235:genetics
D024042:Collagen Type I; D005819:Genetic Markers; D011347:Procollagen; D015675:Osteocalcin; D002116:Calcitonin; D003094:Collagen; C047084:DNA modification methylase PvuII; D015257:DNA-Cytosine Methylases; D015252:Deoxyribonucleases, Type II Site-Specific; C040158:GTAC-specific type II deoxyribonucleases