Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to hypokalemic periodic paralysis ?
    ### Response:
    Mutations in the CACNA1S and SCN4A genes cause hypokalemic periodic paralysis.  The CACNA1S and SCN4A genes provide instructions for making proteins that play an essential role in muscles used for movement (skeletal muscles). For the body to move normally, these muscles must tense (contract) and relax in a coordinated way.
    