A novel compound heterozygote (FAP ATTR Arg104His/ATTR Val30Met) with high serum transthyretin (TTR) and retinol binding protein (RBP) levels.

Abstract:

:A 64-year-old Japanese male suffering from very slowly progressive amyloidosis was studied by immunohistopathologic, mass spectrometric, and molecular genetic methods. After confirming the immunoreactivity of transthyretin (TTR) in the amyloid deposits using an anti-TTR polyclonal antibody, matrix-assisted laser desorption ionization/time-of-flight-mass spectrometry (MALDI/TOF-MS) was employed to look for the presence of variant TTR(s) in the serum. Two variant forms of TTR, one with a molecular weight 32 Da greater and another with a molecular weight 19 Da less than that of normal TTR encoded by the two respective alleles, were detected in this patient. Direct sequence analysis confirmed the presence of a double substitution: one at codon 30 from GTG (Val) to ATG (Met) and the other at codon 104 from CGC (Arg) to CAC (His) in the two alleles. MALDI/TOF-MS of the parents of the proband revealed that his father was a heterozygote of ATTR Arg104His and his mother was a heterozygote of ATTR Val30Met. The total TTR and retinol binding protein (RBP) concentrations in the serum samples of the proband were very high compared with those of FAP ATTR Val30Met patients and control subjects. We report here a new compound heterozygote in the TTR gene with familial amyloidotic polyneuropathy (FAP).

authors

Terazaki H,Ando Y,Misumi S,Nakamura M,Ando E,Matsunaga N,Shoji S,Okuyama M,Ideta H,Nakagawa K,Ishizaki T,Ando M,Saraiva MJ

doi

10.1006/bbrc.1999.1514

subject

Has Abstract

pub_date

1999-10-22 00:00:00

pages

365-70

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)91514-0

journal_volume

264

pub_type

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