Among whites, rs34459162, a novel missense single nucleotide polymorphism (SNP) in <i>RCN3</i>, was associated with fructosamine (<i>P</i> = 5.3 × 10<sup>-9</sup>) and rs1260236, a known diabetes-related missense mutation in <i>GCKR</i>, was associated with percent glycated albumin (<i>P</i> = 5.9 × 10<sup>-9</sup>) and replicated in CARDIA.