RESUMO
Human studies have demonstrated a correlation between noncoding polymorphisms of "the pain protective" haplotype in the GCH1 gene that encodes for GTP cyclohydrolase I (GTPCH1)-which leads to reduced tetrahydrobiopterin (BH4) production in cell systems-and a diminished perception of experimental and clinical pain. Here, we investigate whether heterozygous mutations in the GCH1 gene which lead to a profound BH4 reduction in patients with dopa-responsive dystonia (DRD) have any effect on pain sensitivity. The study includes an investigation of GCH1-associated biomarkers and pain sensitivity in a cohort of 22 patients with DRD and 36 controls. The patients with DRD had, when compared with controls, significantly reduced levels of BH4, neopterin, biopterin, and GTPCH1 in their urine, blood, or cytokine-stimulated fibroblasts, but their pain response with respect to non-painful stimulation, (acute) stimulus-evoked pain, or pain response after capsaicin-induced sensitization was not significantly different. A family-specific cohort of 11 patients with DRD and 11 controls were included in this study. The patients with DRD were heterozygous for the pain protective haplotype in cis with the GCH1 disease-causing mutation, c.899T>C. No effect on pain perception was observed for this combined haplotype. In conclusion, a reduced concentration of BH4 is not sufficient to alter ongoing pain sensitivity or evoked pain responses.
Assuntos
Biopterinas/análogos & derivados , Distúrbios Distônicos/complicações , Distúrbios Distônicos/genética , GTP Cicloidrolase/genética , Mutação/genética , Dor/etiologia , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Animais , Biopterinas/biossíntese , Biopterinas/metabolismo , Capsaicina/farmacologia , Células Cultivadas , Estudos de Coortes , Citocinas/metabolismo , Citocinas/farmacologia , Feminino , Fibroblastos/efeitos dos fármacos , GTP Cicloidrolase/metabolismo , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Neópteros/metabolismo , Dor/genética , Limiar da Dor/fisiologia , Fatores Sexuais , Adulto JovemRESUMO
We present a case of classical Menkes disease (MD) due to a novel "silent" substitution in the ATP7A gene; c.2781G>A (p.K927K). The affected nucleotide is the last nucleotide in exon 13, and affects mRNA splicing. Transcripts missing exon 13; and transcripts missing exons 11, 12 and 13 in addition to a very small amount of normal spliced ATP7A transcripts were expressed. This is the first report of a synonymous ATP7A substitution being responsible for MD.
