DNA sequence, finished

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DNA sequence, finished

DNA sequence, finished

A DNA sequence in which the bases are identified to an accuracy of no more than 1 error in 10,000 and are placed in the right order and orientation along a chromosome with almost no gaps. A finished sequence is as opposed to a draft DNA sequence.

RELATED TERMS
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Orientation
Awareness of one's self in relation to time, place, and person.

Chromosome
A structural unit within a eukaryotic nucleus that carries genes. A chromosome consists of a long, continuous strand of DNA and associated proteins.

SIMILAR TERMS
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DNA (deoxyribonucleic acid)
Any of various acids that are found in cell nuclei and are the principal components of chromosomes; the molecular basis of heredity.

DNA (Deoxyribonucleic Acid)
A chemical substance in plant and animal cells that tells the cells what to do and when to do it. DNA is the information about what each person inherits from his or her parents.

DNA amplification
The production of multiple copies of a sequence of DNA. Repeated copying of a piece of DNA. DNA amplification plays a role in cancer cells. A tumor cell amplifies, or copies, DNA segments as a result of cell signals and sometimes environmental events. Amplification can occur in vivo (in the living individual) or in vitro (literally "in glass", or in a plastic vessel in the laboratory).

DNA assembly
The process of putting fragments of DNA that have been sequenced into their correct chromosomal positions. The pieces of DNA are assembled to reconstitute the sequence of the chromosome from which they came.

DNA cloning
The use of DNA manipulation procedures to produce multiple copies of a single gene or segment of DNA.

DNA forensics
The application of DNA technology and the knowledge of DNA genetics to the practice of forensic medicine and to the power of legal medicine. Crime scene investigation has been markedly changed -- some would say revolutionized -- by the advent of DNA forensics. This has led to the invention of devices for DNA forensics. One is a plate of glass about the size of a hand is etched with very thin channels and reservoirs. A minute sample of DNA is moved between reservoir and channel through timed electric pulses. These thin channels then act like capillary tubes and can resolve the constituents of this minute sample of DNA. At the crime scene, the forensic technician can perform the PCR reactions for DNA fingerprinting and immediately resolve the samples on the glass plate. What normally would take more than a day, once the sample is taken to the laboratory, now takes only a few hours at the crime scene.

DNA methylation
A biochemical process involving the addition of chemical tags called methyl groups (-CH3) to DNA. Methylation can be a signal for a gene or a section of a chromosome to turn off gene expression and become inactive or "silent".

DNA molecules, recombinant
A combination of DNA molecules of different origin that are joined using recombinant DNA technology.

DNA polymerase
Enzyme that catalyzes (speeds) the polymerization of DNA. DNA polymerase uses preexisting nucleic acid templates and assembles the DNA from deoxyribonucleotides.

DNA repair
The body has a series of special enzymes to repair mutations (changes) in the DNA and restore the DNA to its original state. The DNA in genes is constantly mutating and being repaired. This repair process is controlled by special genes. A mutation in a DNA repair gene can cripple the repair process and cause a cascade of unrepaired mutations in the genome that lead to cancer.

DNA repair gene
A gene engaged in DNA repair. When a DNA repair gene is impaired, mutations pile up throughout the DNA. The DNA in genes is constantly mutating and being repaired. This repair process is controlled by special genes. A mutation in a DNA repair gene can cripple the repair process and cause a cascade of unrepaired mutations in the genome that lead to cancer.

DNA repair gene, Med1
A gene that codes for one of the key enzymes involved in repairing DNA. The DNA in genes is constantly mutating and being repaired. This repair process is controlled by special genes. A mutation in a DNA repair gene such as Med1 can cripple the repair process and cause a cascade of unrepaired mutations in the genome that lead to cancer.

DNA repair pathway
The sequence of steps in the repair of DNA. Each step is governed by an enzyme.

DNA replication
A wondrous complex process whereby the ("parent") strands of DNA in the double helix are separated and each one is copied to produce a new ("daughter") strand. This process is said to be "semi-conservative" since one of each parent strand is conserved and remains intact after replication has taken place.

DNA sequence
The precise ordering of the bases (A,T,G,C) from which the DNA is composed. DNA sequencing involves determining the exact order of the base pairs in a segment of DNA.

DNA sequence, draft
Sequence of a DNA with less accuracy than a finished sequence. In a draft sequence, some segments are missing or are in the wrong order or are oriented incorrectly. A draft sequence is as opposed to a finished DNA sequence.

DNA technology, recombinant
A series of procedures used to join together (recombine) DNA segments. A recombinant DNA molecule is constructed (recombined) from segments from 2 or more different DNA molecules. Under certain conditions, a recombinant DNA molecule can enter a cell and replicate there, autonomously (on its own) or after it has become integrated into a chromosome.

DNA virus
A virus in which the genetic material is DNA rather than RNA. The DNA may be either double- or single-stranded. Major groups of double-stranded DNA viruses (class I viruses) include the adenoviruses, the herpes viruses, and the poxviruses. Major groups of single-stranded DNA viruses (class II viruses) include the parvoviruses and coliphages.

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DNA repair gene, Med1
A gene that codes for one of the key enzymes involved in repairing DNA. The DNA in genes is constantly mutating and being repaired. This repair process is controlled by special genes. A mutation in a DNA repair gene such as Med1 can cripple the repair process and cause a cascade of unrepaired mutations in the genome that lead to cancer.

DNA repair pathway
The sequence of steps in the repair of DNA. Each step is governed by an enzyme.

DNA replication
A wondrous complex process whereby the ("parent") strands of DNA in the double helix are separated and each one is copied to produce a new ("daughter") strand. This process is said to be "semi-conservative" since one of each parent strand is conserved and remains intact after replication has taken place.

DNA sequence
The precise ordering of the bases (A,T,G,C) from which the DNA is composed. DNA sequencing involves determining the exact order of the base pairs in a segment of DNA.

DNA sequence, draft
Sequence of a DNA with less accuracy than a finished sequence. In a draft sequence, some segments are missing or are in the wrong order or are oriented incorrectly. A draft sequence is as opposed to a finished DNA sequence.

DNA sequence, finished

DNA technology, recombinant
A series of procedures used to join together (recombine) DNA segments. A recombinant DNA molecule is constructed (recombined) from segments from 2 or more different DNA molecules. Under certain conditions, a recombinant DNA molecule can enter a cell and replicate there, autonomously (on its own) or after it has become integrated into a chromosome.

DNA virus
A virus in which the genetic material is DNA rather than RNA. The DNA may be either double- or single-stranded. Major groups of double-stranded DNA viruses (class I viruses) include the adenoviruses, the herpes viruses, and the poxviruses. Major groups of single-stranded DNA viruses (class II viruses) include the parvoviruses and coliphages.

DNA, coding
A sequence of DNA that codes for protein. Coding DNA sequences are separated by long regions of DNA called introns that have no apparent function. Coding DNA is also known as an exon.

DNA, mitochondrial
Mitochondrial DNA (mtDNA) is the DNA of the mitochondrion, a structure situated in the cytoplasm of the cell rather than in the nucleus (where all the other chromosomes are located). All mtDNA is inherited from the mother. There are 2 to 10 copies of the mtDNA genome in each mitochondrion. mtDNA is a double-stranded, circular molecule. It is very small relative to the chromosomes in the nucleus and so contains only a limited number of genes. It is specialized in the information it carries and encodes a number of the subunits in the mitochondrial respiratory-chain complex that the cell needs to respire. (It also contains genes for some ribosomal RNAs and transfer RNAs). Mutations (changes) in mtDNA can cause disease. The mutations often impair the function of oxidative-phosphorylation enzymes in the respiratory chain. This is especially manifest in tissues with a high energy expenditure such as brain and muscle.

DNA, repetitive
DNA sequences that are repeated in the genome. These sequences do not code for protein. One class termed highly repetitive DNA consists of short sequences, 5-100 nucleotides, repeated thousands of times in a single stretch and makes up satellite DNA. Another class termed moderately repetitive DNA consists of longer sequences, about 150-300 nucleotides, dispersed evenly throughout the genome, and includes what are called Alu sequences and transposons.

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