X chromosome inactivation
Posted: Thu Nov 01, 2007 8:11 am
Another angle to try and figure out the gender difference in MS incidence.
Eur J Neurol. 2007 Oct 26
X chromosome inactivation in females with multiple sclerosis.
Knudsen GP, Harbo HF, Smestad C, Celius EG, Akesson E, Oturai A, Ryder LP, Spurkland A, Orstavik KH.
Department of Medical Genetics, Faculty Division Rikshospitalet, University of Oslo, Oslo, Norway.
The aetiology of multiple sclerosis (MS) is unknown. Autoimmune mechanisms are most probably involved. Loss of immunological tolerance to self-antigens is a common feature of autoimmune disorders. Response to X-linked self-antigens could be influenced by X-chromosome inactivation, and contribute to the gender bias observed in autoimmune disorders. Previous studies have indicated an association between skewed X inactivation and autoimmune thyroid disease and scleroderma. To investigate a potential role of X inactivation in MS, we compared the X-inactivation pattern in 568 female MS patients with controls. We found no difference in degree of skewing between patients (median 64%) and controls (median 65%) (P = 0.474). The X-inactivation pattern did thus not explain the female predominance of MS patients in general. As the aetiology of different subgroups of MS may differ, patients were grouped according to disease course: relapsing-remitting (RR-MS), secondary progressive (SP-MS) and primary progressive (PP-MS). A comparison of the X-inactivation pattern between subgroups indicated a possible difference in degree of skewing between patients with a progressive versus a relapsing course (P = 0.05).
Pubmed link
Eur J Neurol. 2007 Oct 26
X chromosome inactivation in females with multiple sclerosis.
Knudsen GP, Harbo HF, Smestad C, Celius EG, Akesson E, Oturai A, Ryder LP, Spurkland A, Orstavik KH.
Department of Medical Genetics, Faculty Division Rikshospitalet, University of Oslo, Oslo, Norway.
The aetiology of multiple sclerosis (MS) is unknown. Autoimmune mechanisms are most probably involved. Loss of immunological tolerance to self-antigens is a common feature of autoimmune disorders. Response to X-linked self-antigens could be influenced by X-chromosome inactivation, and contribute to the gender bias observed in autoimmune disorders. Previous studies have indicated an association between skewed X inactivation and autoimmune thyroid disease and scleroderma. To investigate a potential role of X inactivation in MS, we compared the X-inactivation pattern in 568 female MS patients with controls. We found no difference in degree of skewing between patients (median 64%) and controls (median 65%) (P = 0.474). The X-inactivation pattern did thus not explain the female predominance of MS patients in general. As the aetiology of different subgroups of MS may differ, patients were grouped according to disease course: relapsing-remitting (RR-MS), secondary progressive (SP-MS) and primary progressive (PP-MS). A comparison of the X-inactivation pattern between subgroups indicated a possible difference in degree of skewing between patients with a progressive versus a relapsing course (P = 0.05).
Pubmed link