The two members found in humans are called Hyccin and Hyccin 2, and are encoded by the genes HYCC1 and HYCC2 respectively. Defects in Hyccin are the cause of Hypomyelination and Congenital Cataract (HCC), also called leukodystrophy hypomyelinating type 5 (HLD5). This disorder is characterised by congenital cataracts, progressive neurologic impairment, and diffuse myelin deficiency. Affected individuals experience progressive pyramidal and cerebellar dysfunction, muscle weakness and wasting prevailing in the lower limbs.
↑Kawasoe T, Furukawa Y, Daigo Y, Nishiwaki T, Ishiguro H, Fujita M, Satoh S, Miwa N, Nagasawa Y, Miyoshi Y, Ogawa M, Nakamura Y (July 2000). "Isolation and characterization of a novel human gene, DRCTNNB1A, the expression of which is down-regulated by beta-catenin". Cancer Res. 60 (13): 3354–8. PMID10910037.
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