Expression of Cacna1d (3-fold), Cacna1g, Cacna1h (4-fold), Cacna2d1, Cacna2d3, and Cacng4 (3-fold) were downregulated in GK compared to control SAN.
Regarding the changes in mRNA of particular interest were (i) downregulation of Gja5 and Gjd3 (4-fold), (ii) downregulation of Trpc6 (6-fold), (iii) downregulation of Hcn4 (5-fold), (iv) downregulation of Cacna1d (3-fold), Cacna1h (4-fold), and Cacng4 (3-fold), (v) downregulation of Kcna5 (5-fold) and Kcnk1 (7-fold) in GK compared to control SAN, and (vi) upregulation of Nppb in GK compared to control SAN.
Cacna1d ([Ca.sub.v]1.3), Cacna1h (Cav3.2), and Cacng4 ([Cav.sub.[gamma]]4) were downregulated in GK compared to control SAN.