Home › Neuroscience › Optimized Analysis of DNA Methylation and Gene Expression from Small, Anatomically-defined Areas of the Brain
Neuroscience JoVE (Open Access) Citable · DOI

Optimized Analysis of DNA Methylation and Gene Expression from Small, Anatomically-defined Areas of the Brain

DOI: 10.3791/3938-v
What you'll learn
  • ✓ Isolate DNA and RNA simultaneously from discrete brain tissue punches
  • ✓ Perform bisulfite conversion and PCR for methylation analysis
  • ✓ Apply RT-PCR to quantify gene expression from brain samples
  • ✓ Analyze epigenetic changes induced by early-life stress in mice
Protocol

A streamlined workflow to study DNA methylation and gene expression changes upon early-life stress is shown. Starting from maternal separation of newborn mice and isolation of discrete brain tissues, we represent a protocol to simultaneously isolate DNA and RNA from brain tissue punches for subsequent bisulfite sequencing and RT-PCR analysis.

Difficulty
advanced
Total time
~3–4 days (including tissue collection, nucleic acid extraction, bisulfite treatment, PCR, and sequencing analysis)
Model organism
Mouse (neonatal, maternal separation paradigm)
Biosafety
BSL-1

Steps

1
Induce early-life stress via maternal separation

Apply maternal separation protocol to newborn mice to model early-life adversity. This creates epigenetic and gene expression changes studied in downstream analyses.

▶ 01:58
2
Collect discrete brain tissue punches

Extract anatomically-defined brain regions using tissue punch methodology. Isolate precise areas to ensure homogeneous samples for accurate methylation and expression profiling.

▶ 02:45
3
Extract DNA and RNA from brain punches

Perform simultaneous nucleic acid isolation from tissue punches using optimized protocols. Obtain both DNA and RNA in single workflow to preserve tissue integrity and reduce sample loss.

▶ 04:02
4
Perform bisulfite conversion and PCR amplification

Treat isolated DNA with bisulfite reagent to deaminate unmethylated cytosines, then amplify target regions via PCR. This converts methylation status into sequence information for downstream analysis.

▶ 06:08
5
Sequence bisulfite-converted DNA amplicons

Perform bisulfite sequencing to determine cytosine methylation patterns at single-nucleotide resolution. Compare methylation across early-life stress and control groups.

▶ 07:41
6
Quantify gene expression and correlate methylation

Use RT-PCR to measure arginine vasopressin (AVP) and other target genes; integrate methylation and expression data to assess epigenetic regulation in response to early-life stress.

▶ 10:57
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