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J Clin Pathol. Feb 2000; 53(2): 95–99.
PMCID: PMC1763296
Danish type gelsolin related amyloidosis: 654G-T mutation is associated with a disease pathogenetically and clinically similar to that caused by the 654G-A mutation (familial amyloidosis of the Finnish type)
C. P. Maury, M. Liljestrom, G. Boysen, T. Tornroth, A. de la Chapelle, and E. Nurmiaho-Lassila
Department of Medicine, University of Helsinki, Finland. peter.maury/at/huch.fi
Background—Familial amyloidosis of the Finnish type (FAF, Finnish hereditary amyloidosis) is caused by a 654G-A mutation in the gelsolin gene on chromosome 9 resulting in the expression of mutant Asn-187 gelsolin which is abnormally proteolytically processed generating amyloidogenic fragments that polymerise into amyloid fibrils. We have recently shown that in a Danish and a Czech family with a clinical syndrome similar to FAF, including corneal lattice dystrophy, cranial neuropathy and skin changes, the disease is caused by another mutation at the same position, namely 654G-T predicting a Tyr-for-Asp substitution at 187 in secreted gelsolin.
Aim—To undertake a closer examination of the Danish subtype of FAF and report immunohistochemical and biochemical findings.
Results—Immunostaining of plasma gelsolin isolated from heterozygous FAF of the Danish subtype revealed a pattern similar to that found in FAF-Asn 187. The > 60 kDa gelsolin species contain an epitope characteristic of the amyloid forming region as revealed by an amyloid specific antibody, whereas the ~50 kDa fragments are devoid of it. Compared with the wild-type gelsolin peptide (Asp-187), the corresponding mutant peptide (Tyr-187) showed dramatically increased fibrillogenicity as revealed by quantitative thioflavine-T based fluorimetry; ultrastructurally, amyloid-like fibrils were formed by the mutant peptide. Immunohistochemistry showed that antibodies directed against residues 231–242 of secreted gelsolin, representing the carboxy terminus of the sequence forming the amyloid protein (residues 173–243) laid down in the tissues in a fibrillar form in FAF, specifically labelled the amyloid deposited in rectum and skin in the Danish (654G-T) subtype.
Conclusions—The 654G-T mutation in the gelsolin gene gives rise to an amyloid disease clinically and pathogenetically similar to that caused by the 654G-A mutation.
Key Words: amyloidosis • Finnish familial amyloidosis • gelsolin mutation 654G-T • fibrillogenesis
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Figure 1 Schematic presentation of the amyloid forming region (residues 173–243) and mutation site in secreted gelsolin (residues 1–755) in Danish-type FAF, as well as the regions of the gelsolin molecule to which the amyloid specific (more ...)
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Figure 2 Reverse phase high pressure liquid chromatography on a Vydac C18 column of synthetic mutant 182–192 gelsolin peptide (Tyr-187).
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Figure 3 Dermal eccrine glands in Danish subtype (Tyr-187) familial amyloidosis showing prominent amyloid deposits in thickened basement membranes. Congo red staining, polarised light, magnification x140.
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Figure 4 Immunogold-silver staining with amyloid specific antibody PoAb 231–242 of a skin biopsy in Danish subtype (Tyr-187) amyloidosis. Amyloid located in basement membranes is specifically stained. Magnification x134.
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Figure 5 Comparison of heterozygous Danish subtype FAF (Tyr-187) and heterozygous Asn-187 FAF by immunoblotting by the monoconal MoAb-2C4 antibody. Lane 1, FAF Asn-187; lane 2, Danish FAF (Tyr-187); STD, prestained molecular weight markers (kDa).
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Figure 6 Immunostaining of the gelsolin fraction isolated from FAF plasma by affinity chromatography on an MoAb-2C4 Sepharose column by polyclonal antiamyloid antibodies directed against the C terminus of the amyloid region (231–242). Lane 1, (more ...)
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Figure 7 Electron micrograph of negatively stained protein assemblies formed by the mutant (Tyr-187) peptide, corresponding to residues 182–192 in gelsolin. Magnification x59 595.
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Figure 8 Comparison of amyloid fibril formation at different peptide concentrations by mutant (Tyr-187) gelsolin 182–192 peptide corresponding to Danish type amyloidosis (filled triangles), by mutant (Asn-187) gelsolin peptide 182–192 (more ...)
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