Prevalence of the HLA-DQB1*0602 allele in narcolepsy and idiopathic hypersomnia patients seen at a sleep disorders outpatient unit in São Paulo

• Autor(a) principal: Coelho, Fernando Morgadinho Santos [UNIFESP]
• Data de Publicação: 2009
• Outros Autores: Pradella-Hallinan, Márcia Lurdes de Cássia [UNIFESP], Predazzoli Neto, Mario [UNIFESP], Bittencourt, Lia Rita Azeredo [UNIFESP], Tufik, Sergio [UNIFESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: http://dx.doi.org/10.1590/S1516-44462009000100004; http://repositorio.unifesp.br/handle/11600/4913
• topic: HLA-DQB1*0602 allele; Narcolepsy; Hypersomnolence; idiopathic; Outpatients; Diagnosis; Alelo HLA-DQB1*0602; Narcolepsia; Hipersonolência idiopática; Pacientes ambulatoriais; Diagnóstico

OBJECTIVE: Narcolepsy (with and without cataplexy) and idiopathic hypersomnia, are disorders with common features but with different HLA-DQB1*0602 allele prevalence. The present study describes the prevalence of HLA-DQB1*0602 allele in narcoleptics with and without cataplexy and in patients with idiopathic hypersomnia. METHOD: Subjects comprised 68 patients who were diagnosed for narcolepsy or idiopathic hypersomnia and 23 healthy controls according to the International Classification of Sleep Disorders-2. Subjects comprised 43 patients with narcolepsy and cataplexy, 11 patients with narcolepsy but without cataplexy, 14 patients with idiopathic hypersomnia and 23 healthy controls. Genotyping of HLA-DQB1*0602 allele was performed for all subjects. RESULTS: The prevalence of the HLA-DQB1*0602 allele was increased in idiopathic hypersomnia and in narcoleptic patients with and without cataplexy when compared to healthy subjects (p = 0.04; p = 0.03 and p < 0.0001, respectively). CONCLUSIONS: This finding is in accordance with those of previous studies. The gold standard exam of narcolepsy with cataplexy is Hypocretin-1 dosage, but in patients without cataplexy and idiopathic hypersomnia, there are no specific diagnostic lab findings. The presence of the HLA-DQB1* 0602 allele may be important for the differential diagnosis of situations that resemble those sleep disorders such as secondary changes in sleep structure due to drugs' consumption.