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Sclerosis multiplex in gypsies

ABSTRACT MS rarely occurs in gypsies in Hungary despite the high DR2 frequency. When it does occur, it has special features more resembling that of Asians than Central Europeans. In order to find correlation between the clinical observations and the immunogenetical data, the distribution of DQw1 subtypes was investigated by means of Eco RV ‐ DQ beta RFLP in DR2 positive healthy gypsies and Hungarians, as well as in DR2‐positive Hungarian and unselected gypsy MS patients. DQw6 correlated with MS susceptibility in Hungarians. This allotype was completely absent in healthy DR2‐positive gypsies. DR2‐positive gypsy MS patients, however, carried DQw6. No correlation of complement allotypes with the occurrence of MS was found in Hungarians, while a striking elevation of C4 QO occurred in gypsy MS patients compared with healthy individuals in the gypsy group. The absence of the DR2, DW2, DQw6 haplotype, and the low frequency of C4A QO in healthy gypsies seems to be associated with the low MS prevalence, but genes outside this region might also influence the MS susceptibility.