Repeated sequence (DNA)
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Repeated sequence (DNA)
In the study of DNA sequences, one can distinguish two main types of repeated sequence:
Tandem repeats: ...
Repeated Sequences
Repeated sequences are short segments of DNA that are repeated hundreds or thousands of times. For example: In the segment of DNA illustrated below, CCG is repeated several times.
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STRs are repeated sequences of a few (usually four) nucleotides, e.g., TCATTCATTCATTCAT. They often occur in the untranslated parts of known genes (whose sequence can be used for the PCR primers).
Tandem repeats Repeated sequences which are arranged consecutively and in the same orientation.
Telomere The DNA structure which stabilises the ends of chromosomes.
A DNA segment composed of repeated sequences linked end to end. Conjugation. The joining of two bacteria cells when genetic material is transferred from one bacterium to another. Constitutive promoter.
If the TS and the DB are the same sequence this is a convenient method to detect all of the repeated sequences, of any length.
A locus including a tandemly repeated sequence may exhibit moderate to high levels of intraspecific variation in the alleles available for that locus. Such loci are thought to have alleles that differ in the number of repeats of the 'core' sequence.
They also have repeated sequences 20-40 nucleotides in length at each end. Insertion sequences are short (600-1500 base pairs long) simple transposons that do not carry genes beyond those essential for insertion of the transposon into E. coli.
In eukaryotes, repeated sequences characterize great amounts of noncoding DNA. Some of this repetitive DNA is dispersed more or less randomly throughout the genome.
 See also: Sequence, DNA, Trans, Genome, Gene
  
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