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Positional Cloning definitions

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  • Positional Cloning
    Experimental approach narrowing from a broad chromosome region to a single gene responsible for a phenotype, often a disease.
  • Candidate Genes
    Subset of genes within a mapped region considered likely to influence a specific phenotype based on location and expression.
  • Chromosome Region
    Segment of a chromosome identified through mapping as potentially harboring a gene linked to a phenotype.
  • Disease Phenotype
    Observable trait or condition resulting from a genetic variant, used as a clue in gene identification.
  • Pedigree
    Diagram showing inheritance patterns across generations, useful for mapping genes in humans.
  • Mapping
    Process of associating genetic markers with phenotypes to localize genes on chromosomes.
  • DNA Marker
    Identifiable DNA sequence used to track inheritance and narrow down gene locations.
  • Recombination Frequency
    Measure of how often genetic material is exchanged between chromosomes, aiding in gene localization.
  • Chromosome Walking
    Technique using overlapping DNA fragments to progressively move toward a gene of interest within a region.
  • Genomic Library
    Collection of overlapping DNA fragments representing an organism's entire genome, used for gene identification.
  • Clone
    Individual DNA fragment from a genomic library, used as a step in chromosome walking.
  • Locus
    Specific physical location on a chromosome where a gene or marker resides.
  • Expression Pattern
    Spatial and temporal profile of gene activity, used to assess candidate genes' relevance to a phenotype.
  • Genetic Cross
    Mating of organisms to analyze inheritance patterns and map genes, commonly used in model organisms.
  • Genotype
    Genetic constitution of an individual, analyzed to correlate with observed phenotypes during mapping.