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Repeats

Biology Repeated sequenceRepetitive DNA

Long terminal repeats have inverted repeats, that is, sequences close to either end are identical when read in opposite directions.

 


Alu Repeats: Source for the Genesis of Simple Sequence Repeats
Santosh S. Arcot, Hernan Bazan, Prescott L. Deininger and Mark A. Batzer ...

Direct repeats are a type of genetic sequence that consists of two or more repeats of a specific sequence.[1] ...

Tandem repeats
Multiple adjacent copies of the same sequence.
Tautomeric shift
A reversible change in the position of a hydrogen atom in a molecule which results in the conversion of the molecule between different isomers.

Tandem repeats Repeated sequences which are arranged consecutively and in the same orientation.
Telomere The DNA structure which stabilises the ends of chromosomes.

The repeats cause the X to have a thread-like portion. It is called a fragile site because it breaks if cultured under certain conditions in the laboratory.
Translocation ...

Inverted repeats are commonly found in
The DNA to which transcription factors bind.
The DNA sequence shown above is that of the glucocorticoid response element where n represents any nucleotide. [Discussion] ...

Interspersed repeats:
SINEs (Short INterspersed Elements),
LINEs (Long INterspersed Elements).
The majority of LINEs are LINE-1 and the majority of SINEs are ALUs.

Short, tandem repeats that are useful as genetic markers See also PCR Glossary.
Other Resources
PubMed Google ...

They are usually quite monotonous repeats of the same sugar (monosaccharide) over and over. The bonds between the sugars may vary to produce polysaccharides with different properties. Glycogen is a polysaccharide we store in our liver.

VNTR stands for "variable number of tandem repeats"
A tandem repeat is a short sequence of DNA that is repeated in a head-to-tail fashion at a specific chromosomal locus. Tandem repeats are interspersed throughout the human genome.

Surprisingly, in addition to commonly accepted structures with a single, contiguous heptad repeat, we identified sequences with multiple, offset heptad repeats.

These may be short repeats just a few nt long, like CACACA etc. They can also range up to a few hundred nt long. Examples of the latter include Alu repeats, LINEs, SINEs. The function of these elements is often unknown.

So for tandem repeats to occur, we have at least two or more of base pairs, and these base pairs are repeated in a way that they can, indeed, be unique to individuals or be more common in set populations than others.

The structure is two inverted repeats separating one small single copy and one large single copy. This structure is very similar in most plants, the size varies between 120 and 160 kb.

Essentially, these VNTR's are small repeats of DNA sequence that exist in multiple copies, and the number of these repeats can vary.

Self-diagonal plot A tool used to search for amino acid sequence repeats within a protein. The protein sequence is displayed on both the vertical and the horizontal axes, running from amino to carboxyl terminis.

See also variable-number-of-tandem-repeats (VNTR) locus.
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Highly polymorphic DNA markers comprised of a variable number of tandem repeats that tend to cluster near the telomeric ends of chromosomes. The repeats often contain a repeat of 10 nucleotides. They are used for genetic mapping. Cf. microsatellite.

Within their characteristic long terminal repeats (LTRs), some retrotransposons encode retroviral-like proteins (e.g., gag, pol) for reverse transcriptase and integrase.

pulse to specifications, the EA fires a pulse, measures the proportions of the resulting product molecules, randomly mutates the beam characteristics with the hope of getting these proportions closer to the desired output, and the process repeats.

recapitulation. Summing up or repeating; hypothesis that an individual repeats its phylogenetic history in its development.
receptacle The expanded tip of a pedicel or peduncle to which the floral organs are attached.

The chromosomal region around which the nucleolus forms, a site of tandem repeats of the rRNA gene. A region (or regions) of the chromosome set physically associated with the nucleolus and containing rRNA genes.

The simplest kind of a transposon, consisting of inserted repeats of DNA flanking a gene for transposase, the enzyme that catalyzes transposition.
insight learning ...

Typically the differences are due to small insertions/deletions such as those caused by differences in the number of simple sequence repeats.

Many organisms share same introns and types of repeats, which is remarkable since we know of no obvious functional reason why these components need to be so similar. These similarities can be explained by descent from a common ancestor.

In the process of making the cDNA strand for the viral RNA, the enzyme also makes long terminal repeats (LTRs) sequences at the terminal ends of the cDNA. These LTRs may also make insertion of the viral DNA into the host DNA easier.

The number of repeats varies between individuals and is used as a basis for genetic identification.
Western Blot Protein blot taken from an electrophoresis gel. Normally probed with a specific antibody.

See also: Sequence, DNA, Trans, Genome, Organ