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An arithmetic sequence is a structured arrangement of numbers where each term is derived by adding a constant value, known as the common difference, to the previous term. This consistent pattern allows for the efficient computation of any term within the sequence as well as the cumulative sum of multiple terms. The formula for finding the nth term of an arithmetic sequence is:Here, aₙ represents the nth term of the sequence, a is the first term, d is the common difference, and n is the...
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Targeted DNA Methylation Analysis by Next-generation Sequencing
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Simultaneous Targeted Methylation Sequencing (sTM-Seq).

Natalie Asmus1, Ligia A Papale1, Andy Madrid1,2

  • 1Department of Neurological Surgery, University of Wisconsin, Madison, Wisconsin.

Current Protocols in Human Genetics
|January 9, 2019
PubMed
Summary
This summary is machine-generated.

Simultaneous targeted methylation sequencing (sTM-Seq) offers a rapid, affordable method to analyze DNA methylation and hydroxymethylation at multiple sites. This technique overcomes NGS data limitations, improving clinical applications and patient care turnaround times.

Keywords:
5-hydroxymethylcytosine5-methylcytosineDNA methylation

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Area of Science:

  • Epigenetics and Genomics
  • Molecular Biology
  • Biotechnology

Background:

  • DNA methylation patterns are crucial for understanding gene regulation, genomic imprinting, and embryonic development.
  • Next-generation sequencing (NGS) provides nucleotide-level epigenomic data but has outpaced targeted validation methods for DNA methylation.
  • Accurate confirmation of epigenetic marks like DNA methylation is essential for clinical applications.

Purpose of the Study:

  • To introduce a rapid and robust protocol, simultaneous targeted methylation sequencing (sTM-Seq), for parallel examination of multiple methylated DNA sequences.
  • To address the limitations of current NGS data validation for epigenetic marks.
  • To provide a scalable and cost-effective solution for high-resolution epigenomic analysis.

Main Methods:

  • Developed sTM-Seq, a protocol enabling parallel examination of multiple methylated DNA sequences.
  • sTM-Seq eliminates the need for large amounts of high-molecular-weight DNA.
  • The method distinguishes between 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC) at the nucleotide level, utilizing universal primers and web-based software.

Main Results:

  • sTM-Seq is scalable, allowing investigation of multiple loci across numerous samples in a single sequencing run.
  • The protocol is affordable and efficient, leveraging freely available software and universal primers.
  • Demonstrated the ability to distinguish between 5mC and 5hmC with nucleotide specificity.

Conclusions:

  • sTM-Seq provides a rapid, robust, and scalable method for targeted DNA methylation and hydroxymethylation analysis.
  • The technique's efficiency and cost-effectiveness facilitate wide-reaching clinical applications.
  • sTM-Seq can improve turnaround rates for same-day procedures and provide high-resolution data for diverse patient settings.