News tagged with dna sequences

Related topics: genes , genome , proceedings of the national academy of sciences , chromosomes , gene expression

Latent virus and life expectancy

The telomeres are repetitive DNA sequences at each end of our chromosomes. Studies show that in every cell division, the telomere is shortened. As a result, the telomere limits the cell to a fixed number of divisions and ...

Jul 02, 2015
popularity 7 comments 0

New ALS gene and signaling pathways identified

Using advanced DNA sequencing methods, researchers have identified a new gene that is associated with sporadic amyotrophic lateral sclerosis (ALS), or Lou Gehrig's disease. ALS is a devastating neurodegenerative ...

Feb 19, 2015
popularity 727 comments 0

Genetic guides to epigenetics

Dirk Schübeler and his group at the Friedrich Miescher Institute for Biomedical Research (FMI) identify determinants that set epigenetic marks along the genome. The new study, published in Nature, shows ...

Feb 10, 2015
popularity 76 comments 8

Brain development controlled by epigenetic factor

McGill researchers have discovered, for the first time, the importance of a key epigenetic regulator in the development of the hippocampus, a part of the brain associated with learning, memory and neural ...

Mar 10, 2015
popularity 164 comments 0

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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