Finnish type familial amyloidosis (FAF) is a neurodegenerative disease, which involves the deposition of D187N or -Y mutant gelsolin fragments as amyloid in various tissues, accompanied by dermatologic, neurologic, and ophthalmologic disorders.
Familial amyloidosis-Finnish type (FAF) results from a single mutation at residue 187 (D187N or D187Y) within domain 2 of the actin-regulating protein gelsolin.
The Asp 187-->Asn (D187N) Asp 187-->Tyr (D187Y) gelsolin mutations facilitate two proteolytic cuts in the parent protein generating a 71-residue fragment that forms amyloid fibrils in humans, putatively causing Finnish type familial amyloidosis (FAF).