Amyloidogenic and non-amyloidogenic transthyretin Asn 90 variants.
Recently, a new transthyretin (TTR) variant was described in the normal Portuguese and German populations. The same substitution was found associated with familial amyloidotic polyneuropathy (FAP) in an American family of Italian origin. Comparative isoelectric focusing studies showed a difference in the mobility pattern between the non-pathogenic and pathogenic variants. However, comparative DNA sequencing between them did not reveal any additional mutation. Comparative isoelectric focusing between the variants and TTR Asn 90 produced by recombinant techniques indicated that the non-pathogenic variant has the electrophoretic behaviour expected for the mutation. We suggest that an as yet unknown post-translational modification may have occurred in the FAP-associated Asn 90 variant, turning it into an amyloidogenic molecule.
Centro de Estudos de Paramiloidose, Hosp. Sto António, Porto, Portugal.
I L
IL
Alves
M R
MR
Almeida
J
J
Skare
M
M
Skinner
K
K
Kurose
Y
Y
Sakaki
P P
PP
Costa
M J
MJ
Saraiva
D000686:Amyloidosis / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D005260:Female; D006801:Humans; D007525:Isoelectric Focusing; D008297:Male; D008969:Molecular Sequence Data; D010523:Peripheral Nervous System Diseases / Q000235:genetics* / Q000378:metabolism; D012150:Polymorphism, Restriction Fragment Length; D011228:Prealbumin / Q000096:biosynthesis / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid
D011228:Prealbumin