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The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Hereditary peripheral neuropathies diagnosed by next-generation sequencing.

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Next-generation sequencing (NGS) identified more genetic causes for hereditary peripheral neuropathy than Sanger sequencing. This advanced genetic testing revealed novel mutations, improving diagnostic yield for patients.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Neurology

Background:

  • Next-generation sequencing (NGS) offers enhanced efficiency for sequencing multiple genes compared to traditional Sanger sequencing.
  • NGS is increasingly utilized for diagnosing complex genetic disorders involving multiple genes.
  • Hereditary peripheral neuropathies are a group of genetic disorders affecting the peripheral nervous system.

Purpose of the Study:

  • To compare the diagnostic yield of next-generation sequencing (NGS) versus Sanger sequencing for hereditary peripheral neuropathy.
  • To evaluate the effectiveness of NGS in identifying genetic causes of peripheral neuropathy.

Main Methods:

  • Retrospective analysis of 103 patient samples investigated for hereditary peripheral neuropathy (2012-2014).
  • Exclusion of PMP22 duplication/deletion.
  • Analysis of 96 samples using NGS with physical enrichment targeting 52 hereditary peripheral neuropathy genes.

Main Results:

  • A genetic cause was identified in 35% of patients with peripheral neuropathy.
  • Next-generation sequencing identified 28 point mutations, accounting for 27% of diagnoses.
  • A significant portion of identified mutations were in genes not previously routinely tested.

Conclusions:

  • Next-generation sequencing demonstrated a higher diagnostic yield for hereditary peripheral neuropathy compared to previous methods.
  • NGS enabled the identification of pathogenic point mutations in genes not typically analyzed by Sanger sequencing.
  • This study highlights the value of NGS in expanding the diagnostic capabilities for hereditary peripheral neuropathies.