Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to pulmonary alveolar microlithiasis ?
    ### Response:
    Pulmonary alveolar microlithiasis is caused by mutations in the SLC34A2 gene. This gene provides instructions for making a protein called the type IIb sodium-phosphate cotransporter, which plays a role in the regulation of phosphate levels (phosphate homeostasis).
    