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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Updated: Jun 29, 2025

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Exploring SVA Insertion Polymorphisms in Shaping Differential Gene Expressions in the Central Nervous System.

Lauren S Hughes1, Alexander Fröhlich1,2, Abigail L Pfaff1,3

  • 1Perron Institute for Neurological and Translational Science, Perth, WA 6009, Australia.

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|March 28, 2024
PubMed
Summary

SVA elements, a type of transposable element, influence gene expression in the central nervous system. These genetic variations are linked to neurodegenerative diseases like ALS, impacting gene regulation.

Keywords:
HLAMAPTRNA-seqSINE-VNTR-Aluamyotrophic lateral sclerosisexpression quantitative trait locigene expression regulationtransposable elementwhole-genome sequencing

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Area of Science:

  • Genomics
  • Neuroscience
  • Molecular Biology

Background:

  • Transposable elements (TEs), comprising ~45% of the human genome, include SINE-VNTR-Alu (SVA) elements capable of genomic mobilization.
  • SVA polymorphisms (presence/absence variations) exist within populations.
  • TEs, including SVAs, are implicated in neurodegenerative diseases (e.g., Parkinson's, ALS), but mechanisms remain unclear.

Purpose of the Study:

  • To investigate the genome-wide influence of reference SVA elements on gene expression in central nervous system (CNS) tissues.
  • To elucidate the role of SVA insertion polymorphisms in gene regulation within the context of neurodegenerative diseases.

Main Methods:

  • Utilized whole-genome sequencing and RNA sequencing data from ALS patients and healthy controls (New York Genome Centre ALS Consortium).
  • Applied matrix expression quantitative trait loci (eQTL) analysis to assess the impact of SVA insertions on gene expression.

Main Results:

  • Reference SVA insertion polymorphisms significantly modulate the expression of numerous genes.
  • This modulation occurs preferentially in the *trans* position and exhibits tissue-specific patterns.
  • SVAs were found to significantly regulate mitochondrial genes and genes within the *HLA* and *MAPT* loci, which are associated with neurodegenerative diseases.

Conclusions:

  • Polymorphic SVAs play a crucial role in gene regulation.
  • TEs, particularly SVAs, are important factors in the pathology of neurodegenerative diseases.
  • This research deepens our understanding of SVA-mediated gene regulation and its implications for CNS disorders.