Sulla eredopatologia delle mesenchimopatie reattive (cosidette malattie del collageno). III. Sulla comune predisposizione genetica al reumatismo acuto primario e al reumatismo cronico primario

Abstract

SUMMARYThis study is based on pedigrees of 479 patients with Primary Rheumatism (287 patients with Rheumatic Fever and 192 with Rheumatoid Arthritis) which are compared with pedigrees of 300 controls. The conclusion of this study is that the predisposition to Rheumatic Fever and to Rheumatoid Arthritis is trasmitted by a single principal autosomal gene wich is dominant and has reduced penetrance and variable expressivity.The appearance of the acute and the chronic forms of the disease is in function of accessory modifying factors, as genetic and acquired ones. These factors condition the variation of the organic reactive response into the ambit of «type of reactivity» trasmitted by the principal factor. The possible existence of accessory modifying factors, admitted because the way of appearance of the disease in the various generations of families, it occurs in similar situations of human and experimental genetics.The predisposition to primary rheumatic disease has no genetic relationship to the diathesis of allergic diseases and the diathesis of degenerative connective tissue disorders (mesenchymotic diathesis).