How to Use Biochemical analyzer gene sequencing Forensic laboratory

August 04, 2023

To use biochemical analyzer gene sequencing in a forensic laboratory, follow these general steps:

Sample Collection and Preservation: Collect biological samples from crime scenes or individuals involved in the investigation. Properly preserve these samples following forensic guidelines to ensure the DNA remains intact and suitable for sequencing.

DNA Extraction: Extract DNA from the collected samples using established techniques such as phenol-chloroform extraction or commercial DNA extraction kits. Ensure that the extracted DNA is of high quality and free from contaminants.

DNA Quantification: Determine the concentration and quality of the extracted DNA using methods like spectrophotometry or fluorometry. This step helps determine the amount of DNA available for sequencing and ensures that the DNA meets the required standards for analysis.

Library Preparation: Prepare DNA libraries for sequencing. This involves fragmenting the DNA into smaller pieces, attaching sequencing adapters, and amplifying the DNA fragments using PCR or other techniques. Different library preparation methods may be used depending on the sequencing technology being employed.

Sequencing: Load the prepared DNA libraries onto the biochemical analyzer gene sequencing platform. Follow the manufacturer's instructions to initiate the sequencing run. The sequencing platform will perform the sequencing reactions and generate raw sequencing data.

Data Analysis: Analyze the generated sequencing data using bioinformatics tools and software. This includes aligning the sequencing reads to a reference genome, identifying genetic variants such as SNPs or STRs, and interpreting the genetic information obtained.

Genetic Profiling and Comparison: Compare the genetic profiles generated from the sequencing data with reference databases, such as forensic DNA databases or missing person databases, to identify individuals or establish relationships. Use specialized software and algorithms to accurately analyze the data and generate genetic profiles.

Interpretation and Reporting: Analyze the genetic data in the context of the specific forensic investigation or case. Interpret the findings and generate a comprehensive report detailing the genetic information, any matches or discrepancies found, and the significance of the findings.

It's important to note that the specific protocols and procedures may vary depending on the laboratory's equipment, sequencing platform, and standard operating procedures. Forensic laboratories should adhere to established guidelines and quality assurance protocols to ensure accurate and reliable results.

Author:

Mr. Mr. Léi

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wanglei@superyears.com

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