Methylated Cytosine Identification
Methylated Cytosine Identification - Related Videos
08:47
DNA Methylation Analysis
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2023
Methylation at CpG dinucleotides is a chemical modification of DNA hypothesized to play important roles in regulating gene expression. In particular, the methylation of clusters of methylation sites, called “CpG islands”, near promoters and other gene regulatory elements may contribute to the stable silencing of genes, for example, during epigenetic processes such as genomic imprinting and X-chromosome inactivation. At the same time, aberrant CpG methylation has been shown to be associated with...
12:34
DNA Methylation: Bisulphite Modification and Analysis
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Cited by 75 •
2011
The gold standard for DNA methylation analysis is genomic sequencing of bisulphite converted DNA. This method takes advantage of the increased sensitivity of cytosine compared with 5-methylcytosine (5-MeC) to bisulphite deamination under acidic conditions. Unmethylated cytosines can be distinguished from methylated cytosines after PCR amplification of the target genomic DNA.
04:28
Multiplex Droplet Polymerase Chain Reaction to Detect DNA Methylation in Leukocytes
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2025
This video demonstrates the multiplex droplet polymerase chain reaction technique for the simultaneous quantification of methylated DNA regions in different white blood cell populations as an early biomarker for clinical diagnosis and prognosis.
07:16
Rapid and Efficient Spatiotemporal Monitoring of Normal and Aberrant Cytosine Methylation within Intact Zebrafish Embryos
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Cited by 3 •
2022
This paper describes a protocol for the rapid and efficient spatiotemporal monitoring of normal and aberrant cytosine methylation within intact zebrafish embryos.
07:13
Detection of Modified Forms of Cytosine Using Sensitive Immunohistochemistry
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Cited by 8 •
2016
Herein we describe a sensitive immunochemical method for mapping the spatial distribution of 5mC oxidation derivatives based on the use of peroxidase-conjugated secondary antibodies and tyramide signal amplification.
FAQs
Bisulfite treatment creates a sequence-level contrast between modified and unmodified cytosines. During treatment, unmethylated cytosine is converted to uracil, whereas 5-methylcytosine remains unchanged. Sequencing then reads the treated DNA, allowing researchers to infer which original cytosine positions carried methyl groups. This makes the approach useful for mapping methylation patterns across DNA.
These approaches generate different types of methylation measurements. Methylation-sensitive restriction enzymes help assess DNA according to whether methylation affects enzyme-based analysis, while antibodies can enrich DNA carrying the modification. Chemical labeling can enrich or measure modified DNA. Bisulfite treatment instead supports sequence-based distinction, so method choice depends on whether researchers need mapping, enrichment, or measurement.
The location and pattern of methylated cytosines provide context for examining gene activity without a change in DNA sequence. Comparing these patterns can help researchers investigate how epigenetic states relate to cellular behavior and biological conditions. Identification is therefore useful not only for detecting the modification, but also for connecting methylation profiles with changes in gene regulation.
A bisulfite-based workflow first exposes DNA to treatment that changes unmethylated cytosines into uracil while preserving 5-methylcytosine. The treated material is then analyzed by sequencing, which reveals the resulting base differences. Researchers use those sequence patterns to identify and map methylated positions, producing a methylation profile that can be compared across biological samples or conditions.
Researchers apply this analysis when they need to examine methylation patterns in contexts such as development, genomic imprinting, cell identity, disease, or responses to environmental and therapeutic conditions. The resulting measurements can reveal associations between epigenetic patterns and these biological states. Such comparisons help define where methylation differs and which conditions may be linked with those differences.
In developmental and cell-biology research, methylation profiles can be compared among developmental states or cell types. These comparisons help investigators examine whether distinct biological identities are associated with different patterns of cytosine modification. The approach also provides a way to study genomic imprinting, where methylation patterns are relevant to understanding parent-associated regulation within biological systems.