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Melanin-free DNA extraction: a rapid and high-efficiency protocol for molecular studies
Sanae El Bardai1,2, Fatima El Agy3, Layla Tahiri Elousrouti3,4
1Interdisciplinary Laboratory of Health, Environment, and Health Techniques, Higher Institute of Nursing Professions and Health Techniques, Fez, Morocco. souina1974@gmail.com.
Molecular Biology Reports
|January 13, 2026
Summary
Melanin in DNA from pigmented tissues inhibits PCR. A new phenol-based protocol effectively removes melanin, improving DNA purity and enabling accurate genetic analysis for melanoma diagnostics.
Area of Science:
- Molecular Oncology
- Genetics
- Biochemistry
Background:
- High-quality genomic DNA is essential for molecular oncology diagnostics.
- Melanin in DNA from melanocytes and melanoma inhibits PCR, impacting diagnostic accuracy.
- Current methods struggle with melanin contamination in pigmented tissues.
Purpose of the Study:
- To develop a rapid and efficient protocol for eliminating melanin contamination from DNA.
- To improve DNA purity and PCR amplification success rates in pigmented samples.
- To enhance the accuracy of genetic analyses for melanoma diagnostics.
Main Methods:
- Developed a protocol involving pre-treatment of sample lysates with phenol before DNA extraction.
- Applied the protocol to 15 pigmented tissue specimens with previously inconclusive molecular testing.
- Performed PCR and Sanger sequencing to assess amplification and genotyping success.
Main Results:
- Phenol pre-treatment significantly enhanced the removal of PCR inhibitors.
- Improved DNA purity and increased PCR amplification and genotyping success rates.
- Demonstrated effectiveness on challenging pigmented tissue samples.
Conclusions:
- The protocol enables simultaneous DNA extraction and purification, removing melanin inhibitors.
- Enhances accuracy and consistency in molecular biology and diagnostic research.
- Supports informed therapeutic strategies for melanoma patients through reliable genetic analysis.
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