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Related Concept Videos

DNA Base Pairing02:27

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Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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DNA-only Transposons02:57

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Methylated DNA Immunoprecipitation
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Developing DNA methylation-based diagnostic biomarkers.

Hyerim Kim1, Xudong Wang2, Peng Jin1

  • 1Department of Human Genetics, School of Medicine, Emory University, Atlanta, GA 30322, USA.

Journal of Genetics and Genomics = Yi Chuan Xue Bao
|March 3, 2018
PubMed
Summary
This summary is machine-generated.

DNA methylation offers a promising, reproducible approach for disease diagnosis, overcoming limitations of genetic markers. These epigenetic biomarkers can be detected noninvasively, advancing clinical implementation for various conditions.

Keywords:
BiomarkerBrain disordersCancerDNA methylationEpigeneticsLiquid biopsyMolecular diagnosis

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Area of Science:

  • Biomolecular science
  • Epigenetics
  • Molecular diagnostics

Background:

  • Traditional disease diagnosis relies on clinical symptoms, which can be subjective and lack specificity.
  • Genetic and transcription-based biomarkers have shown limited clinical utility due to poor reproducibility and accuracy.
  • Epigenetic modifications, particularly DNA methylation, present a more stable and potentially accurate alternative for disease detection.

Purpose of the Study:

  • To highlight the advantages of DNA methylation signatures as diagnostic biomarkers across various diseases.
  • To discuss the potential of DNA methylation for noninvasive disease diagnosis using samples like blood.
  • To identify and address the statistical and technical challenges hindering the clinical implementation of DNA methylation biomarkers.

Main Methods:

  • Review of current literature on epigenetic changes, specifically DNA methylation, in disease pathogenesis.
  • Analysis of studies investigating the diagnostic potential of DNA methylation patterns in clinical samples.
  • Discussion of the feasibility and challenges associated with detecting DNA methylation in noninvasive biological specimens.

Main Results:

  • Distinctive DNA methylation disruptions are associated with specific disease pathologies.
  • DNA methylation biomarkers demonstrate higher specificity and reproducibility compared to genetic markers.
  • Noninvasive detection of DNA methylation in blood samples is feasible for diagnostic purposes.

Conclusions:

  • DNA methylation signatures represent a significant advancement in molecular diagnostics for disease identification.
  • Overcoming statistical and technical hurdles is crucial for the widespread clinical adoption of DNA methylation-based diagnostics.
  • Epigenetic biomarkers hold substantial promise for improving the accuracy and accessibility of disease diagnosis.