Hypophosphatasia: validation and expansion of the clinical nosology for children from 25 years experience with 173 pediatric patients

Bone
M P WhyteSteven Mumm

Abstract

Hypophosphatasia (HPP) is caused by loss-of-function mutation(s) within the gene TNSALP that encodes the "tissue-nonspecific" isoenzyme of alkaline phosphatase (TNSALP). In HPP, inorganic pyrophosphate, an inhibitor of mineralization and substrate for TNSALP, accumulates extracellularly often leading to rickets or osteomalacia and tooth loss, and sometimes to craniosynostosis and calcium crystal arthropathies. HPP's remarkably broad-ranging expressivity spans stillbirth from profound skeletal hypomineralization to adult-onset dental problems or arthropathies without bone disease, which is largely explained by autosomal recessive versus autosomal dominant transmission from among several hundred, usually missense, TNSALP mutations. For clinical purposes, this expressivity has been codified according to absence or presence of skeletal disease and then patient age at presentation and diagnosis. Pediatric patients are reported principally with "odonto", "childhood", "infantile", or "perinatal" HPP. However, this nosology has not been tested using a cohort of patients, and the ranges of the clinical and laboratory findings have not been defined and contrasted among these patient groups. To evaluate the extant nosology for HPP in chil...Continue Reading

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