A common TCN1 loss-of-function variant is associated with lower vitamin B12 concentration in African Americans.
Hu Y, Raffield LM, Polfus LM, Moscati A, Nadkarni G, Preuss MH, Zhong X, Wei Q, Rich SS, Li Y, Wilson JG, Correa A, Loos RJF, Li B, Auer PL, Reiner AP. A common TCN1 loss-of-function variant is associated with lower vitamin B12 concentration in African Americans. Blood. 2018 06 21; 131(25):2859-2863.