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Phenotypic variation between siblings with Metachromatic Leukodystrophy.

Saskia Elgün1, Jakob Waibel1, Christiane Kehrer1

  • 1Department of Paediatric Neurology and Developmental Medicine, University Children's Hospital Tübingen, Hoppe-Seyler-Strasse 1, 72076, Tübingen, Germany.

Orphanet Journal of Rare Diseases
|June 13, 2019
PubMed
Summary
This summary is machine-generated.

Phenotypic variation in Metachromatic Leukodystrophy (MLD) differs between sibling pairs. Juvenile MLD siblings show more consistent symptoms and disease progression than unrelated patients, aiding treatment evaluations and family counseling.

Keywords:
GeneticsGenotypeMetachromatic leukodystrophyNatural courseSiblings

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Area of Science:

  • Genetics
  • Neurology
  • Rare Diseases

Background:

  • Metachromatic Leukodystrophy (MLD) is an autosomal-recessive lysosomal storage disorder.
  • Mutations in the ARSA gene cause MLD.
  • Understanding genotype-phenotype correlation and sibling variability is crucial for clinical trials and family counseling.

Purpose of the Study:

  • To systematically investigate phenotypic variation in MLD siblings.
  • To compare sibling variability with a larger MLD cohort and published case reports.

Main Methods:

  • Detailed clinical data from 12 MLD sibling pairs (3 late-infantile, 9 juvenile) and 61 single patients were analyzed.
  • Phenotypic variability, including age at onset and disease dynamics, was compared between siblings and the general cohort.
  • Published case reports of MLD families were also reviewed.

Main Results:

  • Age at onset variability was similar between MLD siblings and unrelated patients.
  • Juvenile MLD siblings exhibited less variable first symptoms and disease progression compared to the general cohort.
  • Late-infantile MLD siblings showed similar variability in symptoms and disease dynamics as unrelated patients.

Conclusions:

  • Sibling variability in MLD differs based on disease form.
  • Juvenile MLD siblings present a more homogeneous phenotype regarding symptoms and disease evolution.
  • Findings are critical for evaluating treatment efficacy and providing family support in MLD.