ArticleDisease models & mechanisms2023
Unexpected phenotypic and molecular changes of combined glucocerebrosidase and acid sphingomyelinase deficiency.
Article in Disease models & mechanisms, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 4 citations in OpenAlex.
- A zebrafish model of acmsd deficiency does not support a prominent role for ACMSD in Parkinson's disease.NPJ Parkinson's disease · 2025Article
- C9ORF72 Deficiency Results in Neurodegeneration in the Zebrafish Retina.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2024Article
- A zebrafish model of combined saposin deficiency identifies acid sphingomyelinase as a potential therapeutic target.Disease models & mechanisms · 2023Article
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Authors and funding
13 authors at 4 institutions in 3 countries.
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Abstract
Heterozygous variants in GBA1, encoding glucocerebrosidase (GCase), are the most common genetic risk factor for Parkinson's disease (PD). Moreover, sporadic PD patients also have a substantial reduction of GCase activity. Genetic variants of SMPD1 are also overrepresented in PD cohorts, whereas a reduction of its encoded enzyme (acid sphingomyelinase or ASM) activity is linked to an earlier age of PD onset. Despite both converging on the ceramide pathway, how the combined deficiencies of both enzymes might interact to modulate PD has yet to be explored. Therefore, we created a double-knockout (DKO) zebrafish line for both gba1 (or gba) and smpd1 to test for an interaction in vivo, hypothesising an exacerbation of phenotypes in the DKO line compared to those for single mutants. Unexpectedly, DKO zebrafish maintained conventional swimming behaviour and had normalised neuronal gene expression signatures compared to those of single mutants. We further identified rescue of mitochondrial Complexes I and IV in DKO zebrafish. Despite having an unexpected rescue effect, our results confirm ASM as a modifier of GBA1 deficiency in vivo. Our study highlights the need for validating how genetic variants and enzymatic deficiencies may interact in vivo.
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