Differences in viral and host genetic risk factors for development of human T-cell lymphotropic virus type 1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis between Iranian and Japanese HTLV-1-infected individuals

• Published in: Journal of general virology 2005-03, Vol.86 (3), p.773-781
• Main Authors: Sabouri, Amir H, Saito, Mineki, Usuku, Koichiro, Bajestan, Sepideh Naghibzadeh, Mahmoudi, Mahmoud, Forughipour, Mohsen, Sabouri, Zahra, Abbaspour, Zahra, Goharjoo, Mohammad E, Khayami, Esmaeil, Hasani, Ali, Izumo, Shuji, Arimura, Kimiyoshi, Farid, Reza, Osame, Mitsuhiro
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Genetic Predisposition to Disease; Genetics; HLA-A Antigens - genetics; Human T-lymphotropic virus 1; Human T-lymphotropic virus 1 - genetics; Human T-lymphotropic virus 1 - immunology; Humans; Iran; Japan; Microbiology; Miscellaneous; Paraparesis, Tropical Spastic - etiology; Paraparesis, Tropical Spastic - genetics; Paraparesis, Tropical Spastic - immunology; Paraparesis, Tropical Spastic - virology; Risk Factors; Virology
• ISSN: 0022-1317; 1465-2099
• DOI: 10.1099/vir.0.80509-0

1 Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan 2 Department of Medical Information Science, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan 3 Department of Immunology and Immunology Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran 4 Department of Neurology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran 5 Khorasan Blood Transfusion Center, Mashhad, Iran 6 Department of Molecular Pathology, Center for Chronic Viral Diseases, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan Correspondence Mineki Saito mineki{at}m3.kufm.kagoshima-u.ac.jp Human T-cell lymphotropic virus type 1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is a neurological disease observed only in 1–2 % of infected individuals. HTLV-1 provirus load, certain HLA alleles and HTLV-1 tax subgroups are reported to be associated with different levels of risk for HAM/TSP in Kagoshima, Japan. Here, it was determined whether these risk factors were also valid for HTLV-1-infected individuals in Mashhad in northeastern Iran, another region of endemic HTLV-1 infection. In Iranian HTLV-1-infected individuals ( n =132, 58 HAM/TSP patients and 74 seropositive asymptomatic carriers), although HLA-DRB1*0101 was associated with disease susceptibility in the absence of HLA-A*02 ( P =0·038; odds ratio=2·71) as observed in Kagoshima, HLA-A*02 and HLA-Cw*08 had no effect on either the risk of developing HAM/TSP or HTLV-1 provirus load. All Iranian subjects possessed tax subgroup A sequences, and the protective effects of HLA-A*02 were observed only in Kagoshima subjects with tax subgroup B but not in those with tax subgroup A. Both the prevalence of HTLV-1 subgroups and the host genetic background may explain the different risks levels for HAM/TSP development in these two populations.