Abstract:
:The thyrotropin receptor is of fundamental importance to normal thyroid function and is considered to be the predominant antigen affected by the autoantibodies of Graves' autoimmune hyperthyroidism. The identification of the epitopes on the receptor to which the autoantibodies bind or the mechanism by which the autoantibodies arise remain to be established. In this report we have analysed in detail thein vivo transcription of the human TSH receptor gene (hTSH-R), demonstrating the presence of numerous novel TSH receptor transcripts. Northern blot analysis of mRNA from human thyroid tissue using a radiolabelled cDNA probe specific for the extracellular domain of the hTSH-R revealed the presence of small polyadenylated mRNAs, in addition to the full-length hTSH-R mRNA. A PCR strategy devised to clone transcripts with 3' polyadenylation and 5' hTSH-R specific sequences was used to clone five different hTSH-R transcripts (hTSH-R. ST1 to ST5; 250bp-1.7 kb) from human thyroid tissue. Sequence analysis demonstrated that the small transcripts arose by alternative splicing of the hTSH-R mRNA. The transcripts were associated with polysomes and were demonstrated in human thyroid tissue from patients suffering from Graves' disease, sporadic goiter as well as in healthy lobes of thyroid tissue.In situ hybridization demonstrated that two of the alternative transcripts adopted a tissue distribution pattern identical to that of the full-length hTSH-R transcript. The two major truncated transcripts ST4 and ST5 contained unique sequences at the 3' end of the mRNAs and thus potentially represent the molecular origin of soluble TSH receptor variants which have been postulated on numerous occasions.
journal_name
Endocrinejournal_title
Endocrineauthors
Hunt N,Willey KP,Abend N,Balvers M,Jähner D,Northemann W,Ivell Rdoi
10.1007/BF02994449subject
Has Abstractpub_date
1995-03-01 00:00:00pages
233-40issue
3eissn
1355-008Xissn
1559-0100journal_volume
3pub_type
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