NDPACX: a newly defined X-linked Parkinsonian syndrome associated with <i>SLC9A6</i> hemizygote mutation
Bibliographic record
Abstract
Abstract X-linked female-restricted neurodegenerative disorder with Parkinsonian syndrome and cognitive impairment (NDPACX) is a recently recognized clinical entity caused by heterozygous mutations in SLC9A6 on the X chromosome, which encodes the endosomal Na⁺/H⁺ exchanger NHE6 that contributes to endolysosomal trafficking and acidification. While hemizygous SLC9A6 mutations in males cause Christianson syndrome, a severe neurodevelopmental disorder, emerging evidence indicates that female carriers may develop progressive, adult-onset Parkinsonian syndrome variably accompanied by cognitive decline and psychiatric symptoms. These features often resemble those of corticobasal degeneration, progressive supranuclear palsy, and atypical Parkinson’s disease. Although pathological data for NDPACX are currently lacking, mechanistic inferences drawn from Christianson syndrome and animal models implicate endosomal dysfunction, impaired receptor recycling, and tau accumulation, depending on the loss of function. Furthermore, recent findings have linked reduced SLC9A6 expression to the increased vulnerability of the substantia nigra in sporadic Parkinson’s disease, suggesting a broader relevance beyond rare monogenic disorders. In particular, NDPACX represents a model of endolysosomal neurodegeneration that may be related to lysosomal storage diseases or autophagy-related mechanisms commonly implicated in Parkinsonian syndromes. In this review, we summarize the clinical, molecular, and emerging pathological insights into NDPACX and propose that targeting endolysosomal homeostasis may open new therapeutic avenues for both hereditary and idiopathic neurodegenerative diseases characterized by proteinopathies.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".