| DNA polymerase beta | <enzyme> A DNA repair enzyme that catalyses DNA synthesis during base excision DNA repair. Registry number: EC 2.7.7.- (12 Dec 1998) |
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| DNA polymerase i | DNA Polymerase I is an enzyme that aids in DNA replication. It has the following 3 functions: 1. Polymerizes in the 5(r) to 3(r) direction on single-stranded template. 2. Degrades single or double-stranded DNA from a free 3(r)-OH end, and 3. Degrades double-stranded DNA from a free 5(r) end. (09 Oct 1997) |
| DNA polymerase II | <enzyme> An enzyme that aids in DNA replication. It has a number of different functions, including the repair of ultraviolet radiation damaged DNA. (09 Oct 1997) |
| DNA polymerase III | <enzyme> An enzyme that aids in DNA replication. It has a number of different functions, such as: proofreading newly replicated DNA, removing nucleotides from the 3' end of the strand one by one, and binding nucleotides from the 5' end of the strand. (09 Oct 1997) |
| DNA polymerisation | <molecular biology> The making of a DNA molecule from nucleotide monomers by linking them together in a long chain (a polymer). (09 Oct 1997) |
| DNA polymorphism | A condition in which one of two different but normal nucleotide sequences can exist at a particular site in DNA. (05 Mar 2000) |
| DNA primase | <enzyme> A single-stranded DNA-dependent RNA polymerase that functions to initiate, or prime, DNA synthesis by synthesizing a nucleotide RNA polymer. Registry number: EC 2.7.7.- (12 Dec 1998) |
| DNA primers | Short sequences (generally about 10 base pairs) of DNA that are complementary to sequences of messenger RNA and allow reverse transcriptases to start copying the adjacent sequences of mRNA. Primers are used extensively in genetic and molecular biology techniques. (12 Dec 1998) |
| DNA probe | <molecular biology> A small piece of nucleic acid that has been labelled with a radioactive isotope, dye, or enzyme and is used to locate a complementary nucleotide sequence or gene on a DNA molecule. (14 Nov 1997) |
| DNA probes | Species- or subspecies-specific DNA (including complementary DNA (DNA, complementary), conserved genes, whole chromosomes, or whole genomes) used in hybridization studies in order to identify microorganisms, to measure DNA-DNA homologies, to group subspecies, etc. The DNA probe hybridises with a specific mRNA, if present. Conventional techniques used for testing for the hybridization product include dot blot assays, southern blot assays, and DNA:RNA hybrid-specific antibody tests. Conventional labels for the DNA probe include the radioisotope labels 32p and 125i and the chemical label biotin. The use of DNA probes provides a specific, sensitive, rapid, and inexpensive replacement for cell culture techniques for diagnosing infections. (12 Dec 1998) |
| DNA probes, HLA | DNA probes specific for the human leukocyte antigen genes, which represent the major histocompatibility determinants in humans. The four known loci are designated as a, b, c, and d. Specific antigens are identified by a locus notation and number, e.g., HLA-a11. The inheritance of certain HLA alleles is associated with increased risk for certain diseases (e.g., insulin-dependent diabetes mellitus). (12 Dec 1998) |
| DNA probes, HPV | DNA probes specific for the identification of human papilloma virus. (12 Dec 1998) |
| DNA profiling | <molecular biology> See restriction fragment length polymorphism. (18 Nov 1997) |
| DNA-protein interaction | <molecular biology> Any complex that forms between a protein molecule and DNA. Examples are nucleosomes (structures formed for the purpose of DNA storage) and any gene regulatory protein (a protein which regulates transcription by binding to a regulatory region on the DNA). (09 Oct 1997) |
| DNA, protozoan | Deoxyribonucleic acid that makes up the genetic material of protozoa. (12 Dec 1998) |