A mutation in the saposin A domain of the sphingolipid activator protein (prosaposin) gene results in a late-onset, chronic form of globoid cell leukodystrophy in the mouse.

Abstract excerpt

Sphingolipid activator proteins (saposins A, B, C and D) are small homologous glycoproteins derived from a common precursor protein (prosaposin) encoded by a single gene. They are required for in vivo degradation of sphingolipids with short carbohydrate chains. Six cysteines and one glycosylation site are strictly conserved in all four saposins. Total deficiency of all saposins and specific deficiency of saposin...

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