# Alterations in energy production in a Drosophila model for the X-linked dystonia-parkinsonism-related Taf1 deficiency

## TL;DR

This study explores how energy production changes in a fruit fly model of XDP, a rare neurological disorder, and finds that metabolic responses depend on the level of TAF1 deficiency.

## Contribution

The study reveals dosage-dependent metabolic responses to TAF1 deficiency and identifies a compensatory mechanism in lipid-dependent energy production.

## Key findings

- Taf1-deficient flies show upregulated lipid-dependent energy production genes to maintain ATP levels.
- Elevated β-oxidation occurs in flies with severe TAF1 reduction but not in XDP patient fibroblasts.
- Metabolic responses appear to depend on a critical TAF1 dosage threshold.

## Abstract

X-linked dystonia-parkinsonism (XDP), an adult-onset neurodegenerative disorder, is caused by an SVA insertion in the TAF1 gene, containing a hexanucleotide, the length of which is correlated to the severity of the disease. The SVA insertion moderately disrupts gene expression; however, the underlying disease mechanism remains enigmatic.

Here, we characterized a fly model for Taf1 deficiency and performed a pilot RNA sequencing analysis. Subsequently, we validated these findings in Taf1-deficient flies and in XDP patient-derived fibroblasts.

We identified an upregulation of genes involved in lipid-dependent energy production as a compensatory mechanism to maintain proper ATP levels. However, studies in XDP patient-derived fibroblasts with minor TAF1 reduction did not confirm these findings.

β-oxidation is elevated in flies with severe TAF1 reduction but not detected in XDP-patient fibroblasts, suggesting that this compensatory mechanism may only manifest above a critical TAF1 dosage threshold, absent in patient basal conditions. This finding thus suggests that dosage-dependent metabolic responses occur following TAF1 loss.