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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Am+Soc+Nephrol 2018 ; 29 (1): 335-348 Nephropedia Template TP
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Genome-Wide Meta-Analysis Unravels Interactions between Magnesium Homeostasis and Metabolic Phenotypes #MMPMID29093028
Corre T; Arjona FJ; Hayward C; Youhanna S; de Baaij JHF; Belge H; Nagele N; Debaix H; Blanchard MG; Traglia M; Harris SE; Ulivi S; Rueedi R; Lamparter D; Mace A; Sala C; Lenarduzzi S; Ponte B; Pruijm M; Ackermann D; Ehret G; Baptista D; Polasek O; Rudan I; Hurd TW; Hastie ND; Vitart V; Waeber G; Kutalik Z; Bergmann S; Vargas-Poussou R; Konrad M; Gasparini P; Deary IJ; Starr JM; Toniolo D; Vollenweider P; Hoenderop JGJ; Bindels RJM; Bochud M; Devuyst O
J Am Soc Nephrol 2018[Jan]; 29 (1): 335-348 PMID29093028show ga
Magnesium (Mg(2+)) homeostasis is critical for metabolism. However, the genetic determinants of the renal handling of Mg(2+), which is crucial for Mg(2+) homeostasis, and the potential influence on metabolic traits in the general population are unknown. We obtained plasma and urine parameters from 9099 individuals from seven cohorts, and conducted a genome-wide meta-analysis of Mg(2+) homeostasis. We identified two loci associated with urinary magnesium (uMg), rs3824347 (P=4.4x10(-13)) near TRPM6, which encodes an epithelial Mg(2+) channel, and rs35929 (P=2.1x10(-11)), a variant of ARL15, which encodes a GTP-binding protein. Together, these loci account for 2.3% of the variation in 24-hour uMg excretion. In human kidney cells, ARL15 regulated TRPM6-mediated currents. In zebrafish, dietary Mg(2+) regulated the expression of the highly conserved ARL15 ortholog arl15b, and arl15b knockdown resulted in renal Mg(2+) wasting and metabolic disturbances. Finally, ARL15 rs35929 modified the association of uMg with fasting insulin and fat mass in a general population. In conclusion, this combined observational and experimental approach uncovered a gene-environment interaction linking Mg(2+) deficiency to insulin resistance and obesity.