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Boletín médico del Hospital Infantil de México
Print version ISSN 1665-1146
Abstract
CHAVEZ-GUITRON, Luis E. et al. Autosomal recessive osteopetrosis type I: description of pathogenic variant of TCIRG1 gene. Bol. Med. Hosp. Infant. Mex. [online]. 2018, vol.75, n.4, pp.255-259. ISSN 1665-1146. https://doi.org/10.24875/bmhim.m18000028.
Background:
Autosomal malignant osteopetrosis is a rare condition arising from dysfunction of bone-resorbing osteoclasts, in which diagnosis requires a high suspicion index. Treatment of choice is allogeneic stem cell transplantation. Best outcomes occur if the procedure is carried out before damage to cranial nerves ensues; nonetheless, patients improve their clinical condition.
Case report:
An 8-month-old infant was referred for hematology consultation for cytopenias, hepatomegaly, and growth failure. Autosomal malignant osteopetrosis was diagnosed on the basis of physical findings, alteration in calcium and phosphorus metabolism, and hyperdensity of bone. DNA was obtained from the patient and parents; compound heterozygosity of the TCIRG1 gene with a previously non-described deletion (c.1809_1818del) was identified.
Conclusions:
A new pathogenic mutation of TCIRG1 was identified in a Mexican osteopetrotic patient. Hematopoietic stem cell transplantation was offered as the best available treatment but declined by the parents. An early recognition and wider access to this procedure should be implemented.
Keywords : Autosomal malignant osteopetrosis; Hematopoietic stem cell transplantation; Deletion mutation.