SCNN1D [SEP] chromosome
in the short arm of chromosome 1 (Ensembl database code: ENSG00000162572) and starts at nucleotide 1,280,436 on the forward strand. Its length is about 11,583 bp. The gene encodes several alternative transcripts with different transcription and translation initiation sites (see Fig. 1 below). In mRNA samples from human brain, alternative splicing products have been detected, cloned and characterized.
The SCNN1D gene is found in most vertebrates. But the gene has been lost in the mouse and rat genomes. 
Tissue-specific expression.
SCNN1D
The SCNN1D gene encodes for the δ (delta) subunit of the epithelial sodium channel ENaC in vertebrates. ENaC is assembled as a heterotrimer composed of three homologous subunits α, β, and γ or δ, β, and γ. The other ENAC subunits are encoded by SCNN1A, SCNN1B, and SCNN1G.
ENaC is expressed in epithelial cells and is different from the voltage-gated sodium channel that is involved in the generation of action potentials in neurons. The abbreviation for the genes encoding for voltage-gated sodium