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Updated: Jan 16, 2026

Whole-brain Segmentation and Change-point Analysis of Anatomical Brain MRI—Application in Premanifest Huntington's Disease

Whole-brain Segmentation and Change-point Analysis of Anatomical Brain MRI—Application in Premanifest Huntington's Disease

Published on: June 9, 2018

Substantia Nigra as Brainstem Signature in Pediatric-Onset Huntington's Disease: The RAREST-JHD Study.

Umberto Sabatini¹, Sabrina Maffi², Maria Eugenia Caligiuri¹

¹Neuroscience Research Centre, Department of Medical and Surgical Sciences, University Magna Graecia, Catanzaro, Italy.

Movement Disorders Clinical Practice

|October 3, 2025

Summary

Pediatric-onset Huntington's disease (POHD) shows reduced Substantia Nigra (SN) volume, unlike adult-onset HD. This SN volume decrease may explain the parkinsonism seen in POHD patients.

Keywords:

brainstem midbrain parkinsonism pediatric HD substantia Nigra

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Area of Science:

Neuroscience
Neurology
Genetics

Background:

Pediatric-onset Huntington's disease (POHD) presents atypically with parkinsonism and dystonia, differing from adult-onset HD (AOHD).
The underlying brain changes contributing to the POHD phenotype are not well understood.

Purpose of the Study:

To investigate volumetric differences in the midbrain and Substantia Nigra (SN) in POHD compared to AOHD.
To explore the correlation between these brain changes and clinical symptoms in Huntington's disease patients.

Main Methods:

A cross-sectional study utilizing 3T high-field Magnetic Resonance Imaging.
Assessment of POHD (≥60 CAG repeats) and AOHD (≤59 CAG repeats) cohorts using the Unified Huntington Disease Rating Scale (UHDRS).

Main Results:

POHD patients exhibited significantly lower SN volumes compared to AOHD patients (P=0.003).
Reduced striatal volume was also observed in POHD (P<0.05).
Across the entire Huntington's disease cohort, lower SN volume correlated with poorer motor, functional capacity, and independence scores on the UHDRS.

Conclusions:

A decrease in Substantia Nigra (SN) volume may serve as a distinct brain biomarker for POHD.
This SN volume reduction could be a key factor underlying the parkinsonian features characteristic of POHD.