8 public questions tagged with this topic.
DNA probes are used in molecular diagnostics to detect specific DNA sequences by hybridizing with complementary sequences. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biotechnology and its Applications, Topic: DNA probes, molecular diagnostics, hybridization for detection.
DNA probes are used in molecular diagnostics to detect specific DNA sequences by hybridizing with_x000D_ complementary sequences.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA
Autoradiography detects mutated genes by using radioactive probes that hybridize with complementary DNA.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA
Southern blotting uses complementary DNA probes to detect specific DNA sequences through hybridization.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA
Nucleic acid probes must balance specificity, hybridization kinetics, and tissue penetration. Probes shorter than about 15 nucleotides lack sequence complexity and hybridize non-specifically to multiple sites, while excessively long probes exhibit slow reassociation, poor membrane transfer, and limited cellular penetration. Optimal oligonucleotide probes range approximately 20 to 100 nucleotides, providing sufficient uniqueness to recognize single-copy sequences in complex eukaryotic genomes while maintaining high melting temperature and stable duplex formation. This size range enables rapid h
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Fluorescence In Situ Hybridization combines cytogenetics with fluorescence detection. Denatured metaphase chromosomes or interphase nuclei are hybridized with fluorescently labeled locus-specific, centromeric, or whole-chromosome painting probes. Upon specific binding, signals are visualized by fluorescence microscopy, allowing detection of aneuploidies, deletions, duplications, translocations, and amplifications. Unlike SAGE or CGH, FISH preserves cellular morphology and provides single-cell resolution. Comparative genomic hybridization assesses copy number changes but not balanced rearrangem
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
After transfer and fixation of colony DNA to membrane, hybridization with radiolabeled probe specific for insert is carried out. To visualize successful annealing, membranes are exposed to X-ray film sensitive to beta radiation emitted by isotopes such as 32P incorporated into probe backbone. Regions where probe hybridized produce dark spots on film due to autoradiographic emission, aligning with original colony positions. This X-ray autoradiography provides high sensitivity and spatial resolution. Detection does not rely on ultraviolet fluorescence, colorimetric X-gal cleavage, or direct fluo
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Colony hybridization, developed by Grunstein and Hogness, identifies recombinant clones harboring specific DNA sequences without phenotypic screening. Colonies are replica-transferred to nitrocellulose or nylon membrane, lysed with alkali, and DNA denatured and fixed. The membrane is then incubated with a 32P or 35S labeled nucleic acid probe complementary to desired insert. After stringent washing to remove non-specific binding, positive colonies are detected by autoradiography where hybridization signal exposes X-ray film. Blue-white screening and direct antibiotic selection do not employ ra
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
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