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Apoptotic gene variants do not predispose to primary Sjögren’s syndrome in Australians
| The first 150 words of the full text of this article appear below. |
A molecular genetic study has suggested that a common variant in the Fas gene promoter region prevents an autoimmune response to intracellular ribonucleoproteins in some patients with primary Sjögren’s syndrome. How this relates to pathogenesis is unclear, but testing polymorphisms against other autoantigens that relocate to the cell surface during apoptosis may be worth while.
The study in Australian patients tested whether genetic variants in this region were linked to the syndrome. Genotype distributions and allelic frequencies of the two common variants at positions -1377 and -670 were no different in patients and controls, but the allelic frequency of the -670 variant was significantly higher in patients without Ro/La autoantibodies than in those with, raising the possibility that this variant might somehow prevent immunological exposure to these intracellular antigens.
The study typed 101 patients with primary Sjögren’s syndrome and 108 ethnically matched controls for Fas gene promoter variants -1377G
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