Vitamin D dependent rickets type II is an autosomal recessive disease caused by the vitamin D defective receptor. More than 200 patients with different types of lower limb deformities were detected in a rural area of the Cauca department in the southwest part of Colombia. Patients were well nourished and in good physical condition in spite of their deformities. None of them presented alopecia, myopathy, seizures or aminoaciduria. Serum analysis showed significantly lower serum calcium as compared to normal relatives, though in the normal low range, normal phosphorus, high alkaline phosphatase, normal 25‐hydroxyvitamin D3 and high 1,25‐dihydroxyvitamin D3, indicating target organ resistance. The cDNA analysis showed normal nucleotide sequence. We suggest that our patients represent a distinct form of receptor‐positive resistance to vitamin D. This report is the first extensive study on this class of patients.
Al norte del departamento del Cauca se detectó un numeroso grupo de pacientes con deformidades en miembros inferiores (genu varo, genu valgo o ambos) que correspondían clínica y radiológicamente a un cuadro de raquitismo. Ninguno de los pacientes presentaban alopecia, miopatia, tetania o aminoaciduria. La mayoría deellos proceden de un grupo poblacional semiaislado de ancestro afromestizo, en el corregimiento de La Toma, del municipio de Suárez.Los estudios bioquímicos comparativos entre 64 pacientes y 109 individuos no afectados, parientes en primer grado, mostraron en los pacientes una ligera hipocalcemia, niveles normales altos de fósforo sérico, un sustancial incremento de lafosfatasaalcalina,valoresnormalesde proteínasy albúminas y nivelesséricos de paratohormonaaumentados. Estudiosen orinade24 horas mostraron hipocalciuria e hipofosfaturia. A un subgrupo de 8 pacientes se les determino niveles séricos de la 25 (OH)D, y l
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