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In page Hereditary spastic paraplegia:

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Mitochondrial dysfunctions have been connected with developmental and degenerative neurological disorders. Only a few HSP genes encode mitochondrial proteins. Two mitochondrial resident proteins are mutated in HSP: paraplegin and chaperonin 60. Paraplegin is a m-AAA metalloprotease of the inner mitochondrial membrane. It functions in ribosomal assembly and protein quality control. The impaired chaperonin 60 activity leads to impaired mitochondrial quality control. Two genes DDHD1 and CYP2U1 have shown alteration of mitochondrial architecture in patient fibroblasts. These genes encode enzymes involved in fatty-acid metabolism.[citation needed]