Related topics: cells · protein · dna · genetic material · dna sequences

Scientists create new genomic resource for improving tomatoes

Tomato breeders have traditionally emphasized traits that improve production, like larger fruits and more fruits per plant. As a result, some traits that improved other important qualities, such as flavor and disease resistance, ...

Details of the history of inner Eurasia revealed by new study

An international team of researchers has combined archaeological, historical and linguistic data with genetic information from over 700 newly analyzed individuals to construct a more detailed picture of the history of inner ...

New cell subtypes classified in mouse brain

It's been estimated that the human brain contains roughly 100 billion neurons, together completing countless tasks through countless connections. So how do we make sense of the roles each of these neurons play? As part of ...

Cell editors correct genetic errors

Almost all land plants employ an army of cellular editors who correct errors in their genetic information. Researchers at the University of Bonn have now transferred parts of this machinery into a bacterium. Their results ...

'Ibiza is different', genetically

"Ibiza is different." That is what the hundreds of standard-bearers of the "hippie" movement who visited the Pitiusan Island during the 60s thought, fascinated by its climate and its unexplored nature. What they did not imagine ...

Research creates DNA-like molecule to aid search for alien life

In a research breakthrough funded by NASA, scientists have synthesized a molecular system that, like DNA, can store and transmit information. This unprecedented feat suggests there could be an alternative to DNA-based life, ...

page 1 from 23

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:

This text uses material from Wikipedia, licensed under CC BY-SA