Research brief
A recent case study has identified a connection between a genetic mutation and hypertrophic olivary degeneration (HOD), a rare neurological condition. The study examined a 60-year-old woman with symptoms including unsteady gait, vertigo, and oscillopsia. Neurological exams and genetic tests revealed a mutation in the RNF170 gene, previously linked to sensory ataxia. This case suggests RNF170 mutations might increase susceptibility to HOD, which involves degeneration in specific brain areas.
Key points
- HOD is linked to the RNF170 gene mutation.
- The patient showed no family history of ataxia.
- Genetic screening is advised for unexplained HOD.
Uncommon Presentation of HOD
Hypertrophic olivary degeneration (HOD) is a rare neurological disorder involving degeneration of the inferior olivary nuclei in the brainstem. Symptoms typically include palatal tremor, ataxia, and nystagmus. In this case, the patient experienced progressive gait instability and vertigo, along with a sensation described as walking on cotton.
Genetic Insights
Genetic testing revealed a heterozygous mutation in the RNF170 gene, associated with autosomal dominant sensory ataxia. The combination of HOD with an RNF170 mutation is rarely documented, making this case particularly noteworthy. The absence of a family history of ataxia and negative results for common spinocerebellar ataxia genes further emphasise the uniqueness of this presentation.
Clinical Implications
This case suggests that RNF170 gene mutations may predispose individuals to HOD or mimic its symptoms. For patients with unexplained HOD and significant ataxia, genetic screening for RNF170 mutations could be beneficial. These findings provide insight into the potential genetic factors involved in HOD.
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