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Interactions between calcium intake and polymorphisms in genes essential for calcium reabsorption and risk of colorectal neoplasia in a two-phase study.

Zhao J, Zhu X, Shrubsole MJ, Ness RM, Hibler EA, Cai Q, Long J, Chen Z, Jiang M, Kabagambe EK, Zhang B, Hou L, Smalley WE, Edwards TL, Giovannucci EL, Zheng W, Dai Q
Mol Carcinog. 2017 56 (10): 2258-2266

PMID: 28544176 · PMCID: PMC5609815 · DOI:10.1002/mc.22678

The SLC8A1 (solute carrier family 8, member 1) gene, encoding Na /Ca exchanger, is essential in regulating calcium reabsorption and homeostasis. Calcium homeostasis plays a key role in cell proliferation and apoptosis. We hypothesized that polymorphisms in five calcium-regulating genes (SLC8A1, ATP2B1, CALB1, CALB2, and CABP1) interact with calcium intake in relation to the risk of colorectal neoplasia. A two-phase (discovery and replication) study was conducted within the Tennessee Colorectal Polyp Study, including a total of 1275 cases and 2811 controls. In Phase I, we identified six out of 135 SNPs that significantly interacted with calcium intake in relation to adenoma risk. In Phase II, the calcium intake by rs4952490 (SLC8A1) interaction was replicated (P  = 0.048). We found an inverse association between calcium intake (1000-2000 mg/day) and colorectal adenomas, particularly for multiple/advanced adenomas, among the G-allele carriers but not among homozygous carriers of the common variant (A) in rs4952490. In the joint analysis of SLC8A1, KCNJ1, and SLC12A1 SNPs, carriers of variant alleles in at least two genes and with calcium intake above the DRI (1000 mg/day) were approximately 30-57% less likely to have adenomas than those whose calcium intake was below the DRI. The association was stronger for multiple/advanced adenomas. No association was found among those who did not carry any variant alleles in these genes when calcium intake was below 2500 mg/day. These findings, if confirmed, may provide a new avenue for the personalized prevention of colorectal adenoma and cancer.

© 2017 Wiley Periodicals, Inc.

MeSH Terms (15)

Adult Aged Calbindin 1 Calbindin 2 Calcium, Dietary Colorectal Neoplasms Female Humans Male Middle Aged Pharmacogenomic Variants Plasma Membrane Calcium-Transporting ATPases Polymorphism, Single Nucleotide Risk Factors Sodium-Calcium Exchanger

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