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"Cloning and characterization of a cDNA that encodes a 70-kDa novel human thyroid autoantigen."

Chan JY, Lerman MI, Prabhakar BS, Isozaki O, Santisteban P, Kuppers RC, Oates EL, Notkins AL, Kohn LD

Published March 5, 1989 in J Biol Chem volume 264 .

Pubmed ID: 2917966

cDNA clones were isolated by screening a human thyroid carcinoma lambda gt11 library with immunoglobulins purified from serum of a patient with autoimmune Graves' disease. One clone (ML8) containing a 1.25-kilobase (kb) insert hybridized with a single 2.0-kb poly(A+) mRNA in human thyroid and lymphocytes but not in human brain, liver, kidney, or muscle. In addition, this probe also hybridized with a single 2.0-kb poly(A+) mRNA from a rat thyroid cell line (FRTL-5). An apparently full length 2,074-base pair (bp) human cDNA was obtained and sequenced. The nucleotide sequence of the 2,074-bp cDNA includes a 5'-noncoding sequence of 17 bp, a 1827-bp open reading frame, and a 222-bp 3'-noncoding sequence. The canonical polyadenylation signal AATAAA is present 18 bp upstream of the poly(A) tail. This cDNA encodes a 69,812-dalton protein with two potential N-linked glycosylation sites and at least one potential membrane spanning domain. Immunoprecipitation of the in vitro translated protein by sera from several patients with Graves' disease argues that the 69,812-dalton protein is an autoantigen.

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Last modification of this entry: Oct. 6, 2010

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