3-Methyl Glutaconic Aciduria and Elevated Plasma Growth Differentiation Factor 15 Level in an Adult with Monoallelic <i>SPG7</i> Pathogenic Variant.

Pathogenic variants in <i>SPG7</i> cause autosomal dominant progressive muscular atrophy. <i>SPG7</i> encodes an inner mitochondrial membrane protein, paraplegin. Burgeoning lines of evidence have continued to suggest important roles for paraplegin in mitochondria function. Here we report elevated levels of biochemical markers of mitochondria dysfunction [3-methylglutaconic acid and 3-methylglutaric acid (in urine and blood) as well as plasma Growth Differentiation Factor 15 (GDF 15)] in a 65-year-old woman with a heterozygous pathogenic <i>SPG7</i> variant [c.1529C > T (p.Ala510Val)], and evidence of muscle disease as well as chronic cerebral vasculopathy.