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Topic: Premature stop codon

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	MDA Research \| Gentamicin FAQ (Site not responding. Last check: 2007-08-11)
		Mdx mice all have DMD because of a premature stop codon in the dystrophin gene.
		Dystrophin made from a gene with a premature stop codon is too small to be useful and is quickly destroyed by the cell.
		Premature stop codons probably account for a small percentage of disease-causing genetic mutations in most genetic disorders and in some forms of cancer.
	www.mdausa.org /research/gentamicin.html (1296 words)

	Nonsense mutation - Wikipedia, the free encyclopedia
		In genetics, a nonsense mutation is a point mutation in a sequence of DNA that results in a premature stop codon, or a nonsense codon in the transcribed mRNA, and possibly a truncated, and often nonfunctional protein product.
		Suppose that a nonsense mutation were introduced at the fourth triplet in the DNA sequence (CGA) causing the cytosine to be replaced with thymine, yielding TGA in the DNA sequence.
		The remaining codons of the mRNA are not translated into amino acids because the stop codon is prematurely reached during translation.
	en.wikipedia.org /wiki/Nonsense_mutation (309 words)

	MDA News \| Antibiotic Shows Promise As Systemic Treatment for Muscular Dystrophy: MDA Investigators Plan Clinical Trial ... (Site not responding. Last check: 2007-08-11)
		Muscle function in these mdx mice, which have a premature stop codon, was improved and signs of the disease were reversed with the restoration of just 20 percent of normal dystrophin levels.
		Premature stop codons instruct cells to stop making a protein prematurely, before its synthesis is complete.
		A protein that cells manufacture when a premature stop codon exists is usually too small to be useful and is quickly destroyed by the cell.
	www.mdausa.org /news/990729antibiotic.html (1060 words)

	Stickler syndrome: Encyclopedia of Genetic Disorders
		All COL2A1 mutations known to cause Stickler syndrome result in the formation of a premature termination codon within the type-II collagen gene.
		Stickler syndrome has been associated with stop mutations in COL2A1 and with missense and splicing mutations in all of the three genes.
		Because the meaning of a specific missense mutation within the gene coding sequence may not be clear, mutation detection in a parent is not advised without strong clinical support for the diagnosis.
	health.enotes.com /genetic-disorders-encyclopedia/stickler-syndrome (2222 words)

	ExonHit - Alternative Splicing - RNA Processing - mRNA surveillance (Site not responding. Last check: 2007-08-11)
		Such mechanisms assess the position of the protein stop codon within the mature mRNA as a measure of the accuracy of RNA splicing.
		However, if the mRNA surveillance machinery detects an in frame stop codon upstream of the last exon then mechanisms are initiated to either degrade the transcript or remove the premature stop codon to allow expression of almost full length protein.
		In order to verify that the stop codon is positioned in the last exon of the mRNA each exon/exon boundary must be flagged prior to, or during, the RNA splicing process.
	www.exonhit.com /alternativesplicing/pages/rna_processing/4 (444 words)

	Science News Online (8/7/99): Antibiotics for Muscular Dystrophy?
		In some cases—between 5 and 15 percent, according to various estimates—the mutation consists of a premature stop codon, a brief DNA sequence that tells muscle cells to stop making dystrophin before the protein has all of its amino acids.
		His group decided to test the approach on mice whose dystrophin gene has a premature stop codon, causing a degenerative muscle disease similar to Duchenne muscular dystrophy.
		Bedwell and his colleagues have recently tested aminoglycosides on people with cystic fibrosis caused by a premature stop codon—about 5 percent of all cases.
	www.sciencenews.org /pages/sn_arc99/8_7_99/fob1.htm (752 words)

	Potentially decisive evidence against pseudogene ‘shared mistakes’
		Many pseudogenes have been identified in all sorts of organisms on the grounds that they are duplicated genes that exhibit stop codons or other disabling mutations in their DNA sequences, so that they cannot have the full function of the original genes from which derived.
		Members of the orang-gorilla-chimp-human clade share the codon 33 premature stop codon, while the one at codon 187 is found in gorillas, chimps and humans.
		The CGA codon (arginine) mutated to the premature stop codon TGA,
	www.answersingenesis.org /tj/v18/i3/mistakes.asp (4796 words)

	stop codon
		stop codon A set of three nucleotides for which there is no corresponding tRNA molecule to insert an amino acid into the polypeptide chain.
		Three stop codons are known: UAA (ochre), UAG (amber) and UGA (opal).
		...revealed that the patient was a compound heterozygote carrying a previously described mutation located in exon 4 causing a premature stop codon (E255X) and a...
	www.mongabay.com /igapo/biotech/stop_codon.html (174 words)

	Significance of premature stop codons in env of simian immunodeficiency virus.
		Significance of premature stop codons in env of simian immunodeficiency virus.
		The SIVmac251 and SIVmac142 infectious clones have premature stop signals that differ in location by one codon; transfection of these DNAs into human HUT-78 cells yielded virus with a truncated TMP (28 to 30 kilodaltons [kDa]).
		Sequence analysis of viral DNAs from these cultures showed that premature stop codons arising by point mutation were responsible for the change in size of the TMP with time.
	www.aegis.com /aidsline/1990/jan/M9010412.html (582 words)

	UPHS: News and Periodicals: (Site not responding. Last check: 2007-08-11)
		In about 15 percent of Duchenne patients, the disease is caused by a specific type of genetic mutation called a premature stop codon in the dystrophin gene, and it is this group that might benefit from the treatment strategy, so far demonstrated only in mice.
		In about 15 percent of Duchenne patients, a genetic error called a premature stop codon signals cellular protein-production machinery to cease work in midstream, before the job is done.
		Small, short-term clinical trials involving about 15 patients with identified premature stop codon mutations in the dystrophin gene are planned for the near future.
	www.uphs.upenn.edu /news/News_Releases/july99/gentamicin.shtml (645 words)

	Leaky termination at premature stop codons antagonizes nonsense-mediated mRNA decay in S. cerevisiae -- KEELING et al. ...
		UPF3 genes increase the readthrough of stop codons (Maderazo
		that was dependent on the presence of a premature stop codon.
		of a premature stop mutation in the ß-galactosidase
	www.rnajournal.org /cgi/content/full/10/4/691 (6854 words)

	Report on the Rare Diseases and Conditions Research Activities of the NIH 1999 - National Institute on Neurological ... (Site not responding. Last check: 2007-08-11)
		In about 15% of DMD patients, the mutation is a premature stop codon, that is, an incorrect code word in the gene that causes the protein synthesizing machinery of the cell to halt, resulting in the absence of dystrophin.
		The mdx mouse model of DMD also results from a premature stop codon, so it is an especially good model for these 15% of DMD cases.
		For several years, scientists have known that certain antibiotics cause misreading of the genetic code and can sometimes suppress premature stop codons by causing the protein synthesizing machinery to misread the stop, insert another amino acid protein building block, and continue.
	rarediseases.info.nih.gov /html/reports/fy1999/ninds.html (1898 words)

	Answer Key
		The codons are the three-base sequences that indicate which amino acid is to be added to the polypeptide chain.
		By definition, a "nonsense" mutation is a mutation that introduces a premature stop codon.
		Any combination of codons that specify the correct amino acids in their proper order would be sufficient to encode a given polypepetide.
	web.mit.edu /hst.160/www/quiz/eval.htm (2429 words)

	Jason Carnes (Site not responding. Last check: 2007-08-11)
		However, nonsense mutations generate a premature stop codon before the authentic stop codon, causing the ribosome to terminate early and preventing translation of a full-length protein.
		The truncated protein that results from a premature stop codon is frequently non-functional, and the loss of function can lead to disease.
		Release factors are the proteins responsible for terminating translation when the ribosome reaches an authentic stop codon.
	faculty.washington.edu /carnes (545 words)

	Biology 161 Lecture Notes Gene Expression
		The "new" codon may represent a different amino acid, but the change does not alter the performance of the protein.
		Change in a base pair might change the codon's meaning so that the amino acid that is placed erroneously in the protein drastically changes the function of the protein (missense mutation).
		Insertion or deletion of 3 base pairs very close to each other may amount to a silent mutation or a nonsense mutation, depending on the importance of the amino acid that would be missing from the protein.
	www.nsci.plu.edu /~mivey/1612000/chap17.htm (1186 words)

	Report on Research on Rare Diseases in Children: FY 2000 to FY 2005 - National Institute of Neurological Disorders and ... (Site not responding. Last check: 2007-08-11)
		In approximately 15% of individuals with DMD, the mutation is a premature stop codon, an incorrect "code word" in the gene that causes the protein-synthesizing machinery of the cell to halt, resulting in the absence of dystrophin.
		For several years scientists have known that specific antibiotics cause misreading of the genetic code and can sometimes suppress premature stop codons by causing the protein synthesizing machinery to misread the stop, insert another amino acid protein building block, and continue.
		The treatment approach has recently been evaluated in clinical trials to evaluate its effectiveness in improving the function of the 15% of boys with DMD whose genetic defect is a premature stop codon.
	rarediseases.info.nih.gov /html/reports/fy2000child_ht/ninds.html (2688 words)

	NDI Abstract of Article: 645 (Site not responding. Last check: 2007-08-11)
		In about 10% of these cases, a premature stop codon leads to the generation of a truncated, functionally inactive receptor protein.
		In this study, we tested the hypothesis that such GPCR mutations can be functionally rescued in vitro and in vivo by treatment with aminoglycoside antibiotics, which are known for their ability to suppress premature termination codons.
		This is the first study demonstrating that G418 (aminoglycosides) can ameliorate the clinical symptoms of a disease-causing premature stop codon in a member of the GPCR superfamily.
	www.ndif.org /Abstract/jab-645.html (225 words)

	Sheep Exhibit Novel Variations in the Organization of the Mammalian Type II Gonadotropin-Releasing Hormone Receptor ...
		stop codon is present in all breeds examined.
		Samples from all sheep breeds (1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16) were cleaved, indicating presence of the premature stop codon, and control samples (17 18 19) were not cleaved.
		The presence of a stop codon in the middle of the gene, and
	endo.endojournals.org /cgi/content/full/145/5/2362 (6975 words)

	Biology Labs (Site not responding. Last check: 2007-08-11)
		The student is challenged to determine the mutations that have the most devastating effect on the resulting polypeptide and then to think about the implications for the expression of the trait.
		A transition mutation is a purine to purine or pyrimidine to pyrimidine shift.
		A transversion mutation is a purine to pyrimidine or pyrimidine to purine shift.
	www.ncpublicschools.org /curriculum/science/scos/1999/biology/biolabs/04vmps (1305 words)

	A Transcriptionally Active Human Type II Gonadotropin-Releasing Hormone Receptor Gene Homolog Overlaps Two Genes in the ...
		premature stop codon (UGA), and a 3' overlap of the RBM8A gene
		The premature TGA stop codon is shown translated as selenocysteine (SeCys).
		by a frameshift and a premature stop codon, and its expression
	endo.endojournals.org /cgi/content/full/144/2/423 (8139 words)

	Gray Lyons - Genomics - Big Brain Gene
		After cloning and sequencing, one gene- ASPM (abnormal spindle-like microcephaly associated) - was found to have a premature stop codon in the open reading frame of each family.
		For example, the author describes the concept of a premature stop codon and truncated protein: "the gene...
		The mutations produced an inadvertent stop signal in the gene, causing the cell to make a cut-down version of the gene's normal protein." In this short paragraph the author quickly communicated an important biological concept to a general non-science audience.
	www.bio.davidson.edu /courses/genomics/2003/lyons/BigBrain.html (780 words)

	Independent Isolates of the Emerging Subgroup J Avian Leukosis Virus Derive from a Common Ancestor -- Benson et al. 72 ...
		stop codon near the end of the pol gene (4).
		An asterisk indicates a premature stop codon near the end of the pol gene.
		The boxed TAA sequence is the location of the premature stop codon found in HPRS-103 and the two U.S. ALV-J field isolates.
	jvi.asm.org /cgi/content/full/72/12/10301 (2680 words)

	Aminoglycoside antibiotics restore dystrophin function to skeletal muscles of mdx mice -- Barton-Davis et al. 104 (4): ... (Site not responding. Last check: 2007-08-11)
		possesses a premature stop codon in the dystrophin gene.
		the premature stop codon in dystrophin in the mdx mouse, primary
		Suppression of a CFTR premature stop mutation in a bronchial epithelial cell line.
	www.jci.org /cgi/content/full/104/4/375 (4654 words)

	Recognition of Yeast mRNAs as "Nonsense Containing" Leads to Both Inhibition of mRNA Translation and mRNA Degradation: ...
		This termination codon was in a region of the PGK1
		-globin mRNAs that harbor a nonsense codon are degraded in murine erythroid tissues to intermediates lacking regions of exon I or exons I and II that have a cap-like structure at the 5' termini.
		Peltz, S.W., Brown, A.H., and Jacobson, A. mRNA destabilization triggered by premature translational termination depends on three mRNA sequence elements and at least one trans-acting factor.
	www.molbiolcell.org /cgi/content/full/10/11/3971 (4358 words)

	Resistance to Infection by Subgroups B, D, and E Avian Sarcoma and Leukosis Viruses Is Explained by a Premature Stop ...
		Resistance to Infection by Subgroups B, D, and E Avian Sarcoma and Leukosis Viruses Is Explained by a Premature Stop Codon within a Resistance Allele of the tvb Receptor Gene -- Klucking et al.
		Resistance to Infection by Subgroups B, D, and E Avian Sarcoma and Leukosis Viruses Is Explained by a Premature Stop Codon within a Resistance Allele of the tvb Receptor Gene
		is due to the existence of a premature stop codon.
	jvi.asm.org /cgi/content/full/76/15/7918 (2621 words)

	HDCN: Review of abstract by Hansson et al. Genetic heterogeneity of Liddle's syndrome (1995 ASN Meeting) (Site not responding. Last check: 2007-08-11)
		There was a premature stop codon that truncated the cytoplasmic carboxyl terminus in affected subunits.
		These findings were the first identification of the molecular basis of an inherited from of hypertension, and motivated may researchers to study candidate genes in the hypertensive populations.
		Expression of the mutant protein in the context of normal alpha and beta subunits revealed a four fold increase in sodium conductance.
	www.hdcn.com /ab/5a09hans.htm (290 words)

	Curbing the nonsense: the activation and regulation of mRNA surveillance -- Wilusz et al. 15 (21): 2781 -- Genes and ...
		The NMD pathway enables the cell to distinguish between normal and premature stop codons.
		On recognition of a stop codon, the release factors and hUPF1 assemble on the ribosome.
		If the stop codon is premature, the EJC is encountered and interaction occurs.
	www.genesdev.org /cgi/content/full/15/21/2781 (3983 words)

	FAA Mutations
		Creates a frameshift that adds 45 AA after residue 134 and then creates a stop codon.
		Causes a frame shift that inserts 46 A.A and then a stop codon.
		Causes an insertion of 5 new A.A and then a stop codon.
	www.rockefeller.edu /fanconi/mutate/public/faapubmut.html (543 words)

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