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  • Hamdy Ahmad
    Participant

      ChIP-seq (Chromatin Immunoprecipitation Sequencing)

      Cells are crosslinked to preserve protein–DNA interactions.

      Chromatin is fragmented (usually by sonication).

      Antibodies pull down the protein of interest along with bound DNA.

      The DNA fragments are purified and sequenced to identify binding sites.

       

      CUT&RUN (Cleavage Under Targets & Release Using Nuclease)

      Uses permeabilized cells without crosslinking.

      Antibody binds to the target protein in situ.

      A fusion of Protein A and MNase (micrococcal nuclease) cleaves DNA near the binding site.

      Released fragments diffuse out and are sequenced.

       

      CUT&Tag (Cleavage Under Targets & Tagmentation)

      Similar to CUT&RUN but uses a fusion of Protein A and Tn5 transposase.

      Antibody binds to the target protein, and Tn5 inserts sequencing adapters directly at binding sites.

      DNA is ready for sequencing with minimal processing.

      Hamdy Ahmad
      Participant

        Protein C deficiency is a rare genetic trait that predisposes to thrombotic disease. It was first described in 1981. The disease belongs to a group of genetic disorders known as thrombophilias. Protein C deficiency is associated with an increased incidence of venous thromboembolism (relative risk 8–10), whereas no association with arterial thrombotic disease has been found.

        Here is a complete description:

        Protein C deficiency – Wikipedia

        in reply to: What is DNA replication-related template switching? #3530
        Hamdy Ahmad
        Participant

          DNA replication–related template switching is a mutation mechanism that creates reverse-complement copies of sequence regions within a genome by replicating briefly along either the complementary or nascent DNA strand.

           

          Hamdy Ahmad
          Participant

            According to Merriam-Webster dictionary,

            microbiome:

            1- a community of microorganisms (such as bacteria, fungi, and viruses) that inhabit a particular environment and especially the collection of microorganisms living in or on the human body.

            2- the collective genomes of microorganisms inhabiting a particular environment and especially the human body.

            microbiota:

            1- the microscopic organisms of a particular environment.

            2- MICROBIOME sense 1

             

             

            in reply to: What is DNA barcoding? #3241
            Hamdy Ahmad
            Participant

              DNA barcoding is a method of species identification using a short sequence of DNA from a specific gene or genes. Each species has a unique marker sequence like a product in a supermarket having a unique barcode.

              Source: DNA barcoding – Wikipedia

               

               

              in reply to: What is digital PCR? #3203
              Hamdy Ahmad
              Participant
                in reply to: What genes were modified in the donor pig? #280
                Hamdy Ahmad
                Participant

                  A major genetic difference between humans/higher apes and pigs is that they do not share a working version of gal-transferase.

                  That gene is called galactose-alpha-1,3,galactotransferase — gal-transferase for short . All mammals except humans and higher apes have a working version of gal-transferase, which coats cells with an antigen. This means if pig tissue is transplanted into humans our immune system will mount a drastic rejection response as our bodies detect the antigen and attack it. Pigs weren’t part of that lineage. This is a fact, established by comparative research on genomes. Humans are closely related to chimpanzees (and gorillas), with whom we share this missing gene.

                  source: evolution – Are humans descended from chimp-pig hybrids? – Skeptics Stack Exchange

                  in reply to: What is bioinformatics? #203
                  Hamdy Ahmad
                  Participant

                    Bioinformatics is all about computer aided biological research on a molecular level.

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