News tagged with genetic sequence

Related topics: genes , dna sequences , genetic variation

A new era for genetic interpretation

Millions of genetic variants have been discovered over the last 25 years, but interpreting the clinical impact of the differences in a person's genome remains a major bottleneck in genomic medicine. In a paper published in ...

May 27, 2015
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Cancer risk linked to DNA 'wormholes'

Single-letter genetic variations within parts of the genome once dismissed as 'junk DNA' can increase cancer risk through wormhole-like effects on far-off genes, new research shows.

Feb 19, 2015
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Crowdfunding helps solve rare disease mystery

Rare diseases—those that affect fewer than one in 200,000 people—are often identified early in life. Some 30 percent of children afflicted by these "orphan diseases" do not live to see their fifth birthday. ...

Feb 10, 2015
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DNA sequence

A DNA sequence or genetic sequence is a succession of letters representing the primary structure of a real or hypothetical DNA molecule or strand, with the capacity to carry information as described by the central dogma of molecular biology.

The possible letters are A, C, G, and T, representing the four nucleotide bases of a DNA strand — adenine, cytosine, guanine, thymine — covalently linked to a phosphodiester backbone. In the typical case, the sequences are printed abutting one another without gaps, as in the sequence AAAGTCTGAC, read left to right in the 5' to 3' direction. Short sequences of nucleotides are referred to as oligonucleotides and are used in a range of laboratory applications in molecular biology. With regard to biological function, a DNA sequence may be considered sense or antisense, and either coding or noncoding. DNA sequences can also contain "junk DNA."

Sequences can be derived from the biological raw material through a process called DNA sequencing.

In some special cases, letters besides A, T, C, and G are present in a sequence. These letters represent ambiguity. Of all the molecules sampled, there is more than one kind of nucleotide at that position. The rules of the International Union of Pure and Applied Chemistry (IUPAC) are as follows:

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