junk DNA

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junk DNA

that portion of DNA that is not transcribed and expressed, comprising a major fraction of the base pairs of the human genome; much of this DNA is repetitive in seuqence and appears to serve no purpose; its function is not known. segments of DNA that appear to serve no function and are replicated along with the rest of the DNA that serves vital functions; examples are pseudogenes and tandemly repeated DNA sequences that seem functionless but are retained by unequal crossing-over.
Synonym(s): selfish DNA

junk DNA

n.
A DNA sequence that is part of a genome and is not known to code for proteins or to regulate the expression of genes. Junk DNA may constitute up to 95 percent of the human genome and is postulated to be involved in the evolution of new genes and possibly the repair of genes.
Any long stretch of non-protein-coding DNA that composes 97–98% of the human genome, which has been highly conserved in plant and animal genomes over millions of years. It is now recognised that non-coding DNA determines the differences in transcription rates of genes, which is what makes each of us unique, making junk DNA is a misnomer

junk DNA

(jŭngk)
The portion of DNA that is not transcribed and expressed, comprising about 90% of the 3 billion base pairs of the human genome; its function is not known.
Synonym(s): selfish DNA.

junk DNA

The long sequences of DNA between those segments that code for protein. Only three percent of DNA consist of functional genes. The rest is junk DNA and is preserved over millions of years of evolution. Species differ not so much in the number of active genes as in the amount of junk DNA. These facts suggest the junk DNA has an important function, not yet discovered.

junk DNA

DNA of no apparent function, generally in GENOMES ofEUKARYOTES, where sequences have been repeated. Also called non-coding DNA.
References in periodicals archive ?
html (stating that although non-coding DNA was believed to be nonfunctional, some modern researchers are finding that these unexplored regions of DNA may play important roles); New Findings Challenge Established Views on Human Genome, Nat'l Human Genome RESEARCH INST.
Pennacchio added: "The fact that this non-coding region works on genes over 100,000 base pairs away goes to show that non-coding DNA can play important roles in common human disorders.
We are happy to report that under our licensing agreement with GTG, all of Biosearch's oligonucleotide products are now licensed for research use under the GTG patents and so enable the legitimate practice of non-coding DNA analysis.
Genetic Technologies has now licensed its non-coding DNA technology to over 55 companies in a wide variety of life sciences industries.
Researchers have found genes that arose from non-coding DNA in flies, yeast, and primates.
The initial focus of this relationship will be in the area of non-coding DNA analysis.
MELBOURNE, Australia -- Genetic Technologies Limited (NASDAQ:GENE)(ASX:GTG) is pleased to report it has granted a license to its non-coding DNA patents to GENOSENSE Diagnostics GmbH, based in Vienna, Austria.
Cationic lipids are formulated with non-coding DNA (plasmid) to create JVRS-100, a lipid-DNA complex, which as a single product will have utility in multiple infectious disease and cancer applications.
Cationic lipids are formulated with non-coding DNA (plasmid) to create the JuvImmune (JVRS-100) Immunostimulant, a lipid-DNA complex, which as a single product will have utility in multiple infectious disease and cancer applications.
Cationic lipids are formulated with non-coding DNA (plasmid) to create the JuvImmune Immunostimulant, a lipid-DNA complex, which as a single product will have utility in multiple infectious disease and cancer applications.
These tests are known to depend on analysis of non-coding DNA.
GTG's non-coding DNA patents, together with our business model patent, will provide us with the ability to develop and explore exciting and new commercial opportunities in the field of Nutrigenomics.

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