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CRISPR01:59

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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
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CRISPR-CasB technology in forensic DNA analysis: challenges and solutions.

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CRISPR-Cas technology offers advanced forensic DNA analysis for challenging samples like degraded or mixed DNA. However, it can create fraudulent "ghost" DNA profiles, necessitating careful analysis of additional genetic markers.

Keywords:
CRISPR-CasForensic DNAGhost DNAMixed profileSTR-Seq

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Area of Science:

  • Biotechnology
  • Forensic Science
  • Molecular Biology

Background:

  • CRISPR-Cas technology revolutionizes biotechnology with precise gene editing capabilities.
  • Its applications extend beyond clinical uses to forensic DNA analysis.
  • The technology enables targeted genetic marker enrichment for identification.

Purpose of the Study:

  • To explore the applications of CRISPR-Cas technology in forensic DNA analysis.
  • To highlight its utility in analyzing challenging samples like low copy number (LCN), mixed, and degraded DNA.
  • To address the potential threat of CRISPR-Cas technology generating fraudulent "ghost" DNA profiles.

Main Methods:

  • Utilizing CRISPR-Cas for targeted genetic marker enrichment.
  • Employing non-PCR-dependent techniques for DNA analysis.
  • Investigating the modification/alteration of target genetic markers.

Main Results:

  • CRISPR-Cas is effective for analyzing low copy number (LCN), mixed, and degraded DNA samples.
  • DNA alteration via CRISPR-Cas can lead to the generation of "ghost" DNA profiles.
  • Alternative genetic markers and methylation patterns show potential for detecting "ghost" DNA profiles.

Conclusions:

  • CRISPR-Cas technology presents dual utility in forensic science: enabling analysis of difficult samples and posing a risk of profile manipulation.
  • Forensic analysts must be vigilant against "ghost" DNA profiles.
  • Comprehensive analysis using additional markers (non-CODIS, Y-, X-chromosome, mitochondrial DNA) is crucial for validating profiles in suspected cases.