SLC34A2 and potassium-aggravated myotonia: Disruption of the functional activity of the NaPi2b transporter, caused by pathogenic variants in the SLC34A2 gene, is considered a contributing factor to a rare autosomal recessive disease known as pulmonary alveolar microlithiasis (PAM), characterized by the accumulation of concretions, primarily composed of calcium phosphates in the alveoli, leading to lung tissue damage [61].