Hypophosphatasia (hī-pō-ˌfäs-fə-ˈtā-zh(ē-)ə) or HPP is an inherited (genetic) metabolic disorder. People with this condition have low levels of the enzyme alkaline phosphatase (ALP), which often affects the development of bones and teeth.

Typically, the earlier HPP symptoms become apparent, the more severe the condition. It is estimated that severe forms of HPP occur in approximately one of every 100,000 live births. While exact numbers are unknown, it is estimated that one out of every 200 Americans may be a carrier for HPP.

Diagnosis is generally made through x-rays and blood tests and the disease is classified based on the age at which symptoms first appear. The five main types of HPP are: Odonto, Perinatal, Infantile, Childhood and Adult. Researchers understand HPP is a genetic condition of the TNSALP gene, which is part of a patient’s genetic makeup, regardless of when it is diagnosed. However, a genetic diagnosis is currently not an adequate predictor of severity of disease. More research is underway and funded by Soft Bones to gain a better understanding of the genotype/phenotype relationship.

For more information, please see our publications created by HPP experts and members of the Soft Bones Scientific Advisory Board.