Abstract:
:Thyroid lymphocyte RNA from a Hashimoto patient exhibiting high titre serum IgG autoantibodies against thyroglobulin (Tg) has been used to construct a Fab library in phage lambda. Screening of this library with radioiodinated Tg has permitted the cloning of an anti-Tg antibody (MH52) with an affinity of 4.5 x 10(9) molar-1 as determined by inhibition ELISA. Sequence analysis showed MH52 to be an authentic antibody of the IgG1/K isotype with variable region genes from the VHI and VKIII families in combination with the JH3, DK4 and JK2 gene segments. The MH52 light chain gene showed high sequence homology (93%) with the germline gene used by several rheumatoid factors and some DNA autoantibodies. Greater divergence from the germline was observed in the case of the MH52 heavy chain gene which showed 86% homology with a germline heavy chain gene isolated from human liver. Overall the similarity between the genes coding for MH52 and the genes coding for some other autoantibodies of non-related specificity might suggest that similar regulatory processes control the formation of these different autoantibodies.
journal_name
Autoimmunityjournal_title
Autoimmunityauthors
Hexham JM,Furmaniak J,Pegg C,Burton DR,Smith BRdoi
10.3109/08916939209150320subject
Has Abstractpub_date
1992-01-01 00:00:00pages
135-41issue
2eissn
0891-6934issn
1607-842Xjournal_volume
12pub_type
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