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[Autosomal dominant spastic paraplegias].

G E Rudenskaya1, V A Kadnikova1, L A Bessonova1

  • 1Bochkov Research Center for Medical Genetics, Moscow, Russia.

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Summary

This study identified nine mutations in six genes responsible for autosomal dominant spastic paraplegias (AD-SPG). It characterized the spectrum and clinical features of these rare genetic disorders.

Keywords:
SPG12SPG17SPG31SPG6SPG8SPG9Amassive parallel sequencing (MPS)mutationsphenotypesspastic paraplegias

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Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Autosomal dominant spastic paraplegias (AD-SPG) are a heterogeneous group of inherited neurological disorders.
  • Understanding the genetic basis and clinical spectrum of rare AD-SPG subtypes is crucial for diagnosis and management.

Purpose of the Study:

  • To determine the frequency and range of infrequent autosomal dominant spastic paraplegias (AD-SPG).
  • To investigate the molecular and clinical characteristics of these AD-SPG subtypes in affected families.

Main Methods:

  • Studied ten families with six diagnosed AD-SPG subtypes using clinical, genealogical, and molecular-genetic approaches.
  • Employed massive parallel sequencing, spastic paraplegia gene panels, whole-exome sequencing, MLPA, and Sanger sequencing.
  • Utilized bioinformatic analyses for mutation detection and characterization.

Main Results:

  • Identified nine heterozygous mutations across six genes, including novel mutations in WASHC5 (SPG8) and RTN2 (SPG12), and REEP1 (SPG31).
  • Confirmed known mutations in NIPA1 (SPG6), ALDH18A1 (SPG9A), and BSCL2 (SPG17).
  • Observed 'pure' spastic paraplegia phenotypes in SPG6, SPG8, SPG12, and SPG31, with SPG31 showing the mildest course.

Conclusions:

  • This research expands the understanding of genetic variations in AD-SPG and their associated clinical presentations.
  • SPG31 exhibited a benign course, while SPG9A and SPG17 presented with 'complicated' paraplegias, including potential later-onset amyotrophy.
  • The study highlights the importance of comprehensive genetic testing for diagnosing rare forms of spastic paraplegia.