Dna Samples
Dna Samples - Related Videos
13:16
Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA
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Cited by 26 •
2018
Here, we present a protocol for tracing genomic DNA (gDNA) contamination in RNA samples. The presented method utilizes primers specific for the internal transcribed spacer region (ITS) of ribosomal DNA (rDNA) genes. The method is suited for reliable and sensitive detection of DNA contamination in most eukaryotes and prokaryotes.
07:58
Cell-Free DNA Integrity Analysis in Urine Samples
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Cited by 16 •
2017
A method for analyzing DNA integrity in the cell-free supernatant fraction of urine samples is proposed. The method is suitable for early detection of urological malignancies and has proven accurate for the early diagnosis of bladder cancer.
04:36
Bisulfite Conversion of Genomic DNA: A Method to Study DNA Methylation in Genomic DNA Samples from Gastrointestinal Cancer Tissue
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2023
This video demonstrates the procedure of bisulfite modification of genomic DNA from gastrointestinal cancer samples. The technique is beneficial for investigating the relationship between genes’ methylation patterns and establishing their contribution to carcinogenesis.
11:00
Genotyping of Plant and Animal Samples without Prior DNA Purification
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Cited by 14 •
2012
The Direct PCR approach presented here facilitates PCR amplification directly from small amounts of unpurified plant and animal tissue.
09:16
Air-sampled Filter Analysis for Endotoxins and DNA Content
0 Views •
2016
Two complementary analyses of atmospheric biological particles from air sampled filters are described herein: the extraction and detection of endotoxin, and of DNA.
FAQs
Preparation begins by breaking open cells to release their contents, followed by separating DNA from proteins and other cellular components. The resulting purified material can then serve as input for polymerase chain reaction, sequencing, genotyping, or cloning. This sequence of steps matters because downstream analyses depend on obtaining DNA sufficiently separated from substances that could compromise testing.
Contamination introduces unwanted biological material that may alter the apparent genetic result, whereas degradation reduces the quality of the material available for testing. Either problem can affect experimental accuracy and complicate interpretation. Researchers therefore treat collection, storage, and quality assessment as connected controls rather than as separate administrative steps.
Quality assessment helps determine whether a preserved DNA preparation remains reliable for testing. It is especially important because contamination or degradation can distort experimental accuracy, making a genetic result harder to interpret confidently. By checking sample condition before analysis, researchers can better connect findings from sequencing, genotyping, polymerase chain reaction, or cloning to the original biological specimen.
A basic workflow starts with collecting a biological specimen, such as blood, saliva, tissue, or cultured cells. Cells are then broken open, DNA is separated from proteins and other components, and the purified material is preserved. After quality assessment, it can be directed to polymerase chain reaction, sequencing, genotyping, or cloning, depending on the study.
Purified DNA should be preserved as part of a controlled workflow because later testing depends on maintaining reliable material. The overview identifies storage and preservation as essential, alongside collection and quality assessment. Their purpose is to limit degradation and support accurate genetic analysis. This is relevant whether the sample will undergo sequencing, genotyping, polymerase chain reaction, or cloning.
They support studies of gene structure, genetic variation, disease mechanisms, and comparisons among organisms. The appropriate downstream method depends on the question: sequencing, genotyping, polymerase chain reaction, and cloning are among the techniques enabled by prepared material. In biology, these applications connect molecular evidence in a sample with broader investigations of heredity and organismal characteristics.