Heterologous expression of mBCNG-1 demonstrated that it codes for a channel with properties indistinguishable from pacemaker channels in brain and similar to those in heart.
The study identifies mBCNG-1 as a gene encoding a hyperpolarization-activated pacemaker channel, establishing a new gene family relevant to pacemaker activity in the heart and brain.
The generation of pacemaker activity in heart and brain is mediated by hyperpolarization-activated cation channels that are directly regulated by cyclic nucleotides. We previously cloned a novel member of the voltage-gated K channel family from mouse brain (mBCNG-1) that contained a carboxy-terminal cyclic nucleotide-binding domain (Santoro et al., 1997) and hence proposed it to be a candidate gene for pacemaker channels. Heterologous expression of mBCNG-1 demonstrates that it does indeed code for a channel with properties indistinguishable from pacemaker channels in brain and similar to those in heart. Three additional mouse genes and two human genes closely related to mBCNG-1 display unique patterns of mRNA expression in different tissues, including brain and heart, demonstrating that these channels constitute a widely expressed gene family.
Santoro et al. (1998) studied this question. Heterologous expression of mBCNG-1 was evaluated on Channel properties. Heterologous expression of mBCNG-1 demonstrated that it codes for a channel with properties indistinguishable from pacemaker channels in brain and similar to those in heart.