Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Myoclonic epilepsy with ragged red fibers ?
    ### Response:
    What are the signs and symptoms of Myoclonic epilepsy with ragged red fibers? Because muscle cells and nerve cells have especially high energy needs, muscular and neurological problems are common features of diseases that affect the mitochondria.  MERRF is a progressive multi-system syndrome with symptoms that begin during childhood, but onset may occur in adulthood.
    