News tagged with genetic sequence

Related topics: genes , dna sequences , genetic variation

Genetics of cancer: Non-coding DNA can finally be decoded

Cancer is a disease of the genome resulting from a combination of genetic modifications (or mutations). We inherit from our parents strong or weak predispositions to developing certain kinds of cancer; in addition, we also ...

Jul 23, 2014
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A new syndrome caused by mutations in AHDC1

A team of researchers led by Baylor College of Medicine have identified the gene underlying a newly recognized genetic syndrome that has symptoms of sleep apnea, delayed speech and hyptonia, or generalized upper body weakness.

May 01, 2014
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Refining the language for chromosomes

When talking about genetic abnormalities at the DNA level that occur when chromosomes swap, delete or add parts, there is an evolving communication gap both in the science and medical worlds, leading to inconsistencies in ...

Apr 17, 2014
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Important discovery for the diagnosis of genetic diseases

A study conducted by Marie Kmita's team at the IRCM, in collaboration with Josée Dostie at McGill University, shows the importance of the chromatin architecture in controlling the activity of genes, especially those required ...

Jan 16, 2014
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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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