Summary
β-Mannosidase deficiency was demonstrated in fibroblasts of a girl who showed severe psychomotor retardation, bone deformities and gargoylism and recurrent skin and respiratory infections and who died at 20 years of age from bronchopneumonia. This first demonstration of a female patient confirms the autosomal recessive inheritance of β-mannosidosis. Further investigation of this gipsy family revealed β-mannosidosis in an older brother with a milder manifestation of gargoyl facial dysmorphology, mental retardation, hearing impairment and recurrent infections. β-Mannosidase activity was completely deficient in his cultured skin fibroblasts, leukocytes and plasma. In urine a characteristic disaccharide was present. Heterozygote levels of β-mannosidase were found in fibroblasts and/or plasma of the parents and one sister.
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Kleijer, W.J., Hu, P., Thoomes, R. et al. β-Mannosidase deficiency: Heterogeneous manifestation in the first female patient and her brother. J Inherit Metab Dis 13, 867–872 (1990). https://doi.org/10.1007/BF01800211
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DOI: https://doi.org/10.1007/BF01800211