News tagged with dna sequences
Neuroscientists show 'jumping genes' may contribute to aging-related brain defects
As the body ages, the physical effects are notable; wrinkles in the skin appear, physical exertion becomes harder. But there are also less visible processes going on. Inside aging brains there is another phenomenon at work, ...
Neuroscience
Apr 08, 2013 |
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Researchers find controlling element of Huntington's disease
A three molecule complex may be a target for treating Huntington's disease, a genetic disorder affecting the brain. This finding by an international research team including scientists from the German Center for Neurodegenerative ...
Diseases, Conditions, Syndromes
Feb 26, 2013 |
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Genes and their regulatory 'tags' conspire to promote rheumatoid arthritis, study finds
In one of the first genome-wide studies to hunt for both genes and their regulatory "tags" in patients suffering from a common disease, researchers have found a clear role for the tags in mediating genetic ...
Genetics
Jan 20, 2013 |
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Genomic 'hotspots' offer clues to causes of autism, other disorders
An international team, led by researchers from the University of California, San Diego School of Medicine, has discovered that "random" mutations in the genome are not quite so random after all. Their study, ...
Genetics
Dec 20, 2012 |
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Scientists pair blood test and gene sequencing to detect cancer
Scientists at the Johns Hopkins Kimmel Cancer Center have combined the ability to detect cancer DNA in the blood with genome sequencing technology in a test that could be used to screen for cancers, monitor cancer patients ...
Cancer
Nov 28, 2012 |
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Proteins expressed by human cytomegalovirus mapped
(Medical Xpress)—A new study in the US and Germany has added to our understanding of the human cytomegalovirus (HCMV) and how it manipulates the cells it infects.
Medical research
Nov 23, 2012 |
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Mutations in genes that modify DNA packaging result in Facioscapulohumeral Muscular Dystrophy
A recent finding by medical geneticists sheds new light on how Facioscapulohumeral Muscular Dystrophy develops and how it might be treated. More commonly known as FSHD, the devastating disease affects both ...
Genetics
Nov 11, 2012 |
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About face: Long-ignored segments of DNA play role in early stages of face development
(Medical Xpress)—The human face is a fantastically intricate thing. The billions of people on the planet have faces that are individually recognizable because each has subtle differences in its folds and ...
Genetics
Oct 22, 2012 |
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Epigenetic analysis of stomach cancer finds new disease subtypes
Researchers at the Duke-NUS Graduate Medical School in Singapore have identified numerous new subtypes of gastric cancer that are triggered by environmental factors.
Cancer
Oct 17, 2012 |
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Genetic error linked to rare disease that causes chronic respiratory infections
(Medical Xpress)—Scanning the DNA of two people with a rare disease has led scientists to identify the precise genetic error responsible for their disorder, primary ciliary dyskinesia.
Genetics
Oct 16, 2012 |
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Single change in genetic sequence can significantly impact BMI variability
(Medical Xpress)—One small change to the DNA sequence can cause more weighty changes to the human body, according to a new study released today.
Genetics
Sep 17, 2012 |
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Scientists map the genomic blueprint of the heart
Scientists at the Gladstone Institutes have revealed the precise order and timing of hundreds of genetic "switches" required to construct a fully functional heart from embryonic heart cells—providing new ...
Medical research
Sep 13, 2012 |
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Gene therapy restores sense of smell, may aid research into other diseases caused by cilia defects
Scientists have restored the sense of smell in mice through gene therapy for the first time—a hopeful sign for people who can't smell anything from birth or lose it due to disease.
Medical research
Sep 02, 2012 |
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New method enables sequencing of fetal genomes using only maternal blood sample
Researchers at the Stanford University School of Medicine have for the first time sequenced the genome of an unborn baby using only a blood sample from the mother.
Genetics
Jul 04, 2012 |
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New technique could transform epigenetics research
(Medical Xpress) -- Collaboration between scientists at Cambridge University and the Babraham Institute have demonstrated a new technique that will significantly improve scientists' ability to perform epigenetics ...
Genetics
Apr 26, 2012 |
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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:
For more information about DNA sequence, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
