Levy E, Haltia M, Fernandez-Madrid I, Koivunen O, Ghiso J, Prelli F, Frangione B
Department of Pathology, New York University Medical Center, New York 10016.
J Exp Med. 1990 Dec 1;172(6):1865-7. doi: 10.1084/jem.172.6.1865.
Familial amyloidosis, Finnish type (FAF), is an autosomal dominant form of familial amyloid polyneuropathy. The novel amyloid fibril protein found in these patients is a degradation fragment of gelsolin, an actin-binding protein. We found a mutation (adenine for guanine) at nucleotide 654 of the gelsolin gene in genomic DNA isolated from five FAF patients. This site is polymorphic since the normal allele was also present in all the patients tested. This mutation was not found in two unaffected family members and 11 normal controls. The A for G transition causes an amino acid substitution (asparagine for aspartic acid) that was found at position 15 of the amyloid protein. The mutation and consequent amino acid substitution may lead to the development of FAF.
芬兰型家族性淀粉样变性(FAF)是家族性淀粉样多神经病的常染色体显性形式。在这些患者中发现的新型淀粉样纤维蛋白是凝溶胶蛋白(一种肌动蛋白结合蛋白)的降解片段。我们在从5名FAF患者分离的基因组DNA中,发现凝溶胶蛋白基因第654位核苷酸处有一个突变(鸟嘌呤突变为腺嘌呤)。该位点具有多态性,因为在所有检测的患者中也存在正常等位基因。在两名未受影响的家庭成员和11名正常对照中未发现此突变。由A到G的转变导致在淀粉样蛋白第15位出现氨基酸替代(天冬氨酸被天冬酰胺替代)。该突变及随之而来的氨基酸替代可能导致FAF的发生。