[A report of two siblings with both maternal dentato-rubro-pallido-luysian atrophy and paternal Ehlers-Danlos syndrome type III].

The report deals with the first description of two siblings, a 43-year-old woman and 39-year-old man, who have developed cerebellar ataxia, choreoathetosis, dementia, epilepsy, hyperelasticity of the skin, and hypermobility and dislocation of joints. The frequent dislocations of joints sometimes could not be corrected surgically. Their mother and maternal uncle have the same neurological signs and symptoms as the siblings do. However, they do not present with the signs of skin and joints. Gene analysis of peripheral blood lymphocytes from these 4 patients revealed that the CAG repeat length of the dentato-rubro-pallido-luysian atrophy (DRPLA) gene is increased in all four. On the contrary, their father has displayed only hyperelasticity of the skin. From the clinical signs, family history and skin biopsy, we consider that the siblings and their father have Ehlers-Danlos syndrome (EDS) type III. In conclusion, the previously unreported coincidental development of maternal DRPLA and paternal EDS observed in two siblings deserves to be described.