Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to benign chronic pemphigus ?
    ### Response:
    Benign chronic pemphigus results from mutations in the ATP2C1 gene. This gene provides instructions for producing a protein called hSPCA1, which is found in many types of cells. The hSPCA1 protein helps cells store calcium until it is needed. Calcium has several critical functions in cells, including regulating cell growth and division and helping cells stick to one another (cell adhesion).
    