Such models aim to elucidate the contribution
of single genes for protection against mutations, genomic instability, ageing and ageing related diseases such as cancer.
With the data provided by the FLI researchers, scientists around the world may now set targeted mutations to investigate the relevance
of single genes for aging, in order to better understand regulating mechanisms and, eventually, develop new approaches for therapy or prevention of aging - related diseases.
Not exact matches
(insert your own, southerners backwoods joke here) So Mendel fails, in my mind, to adequately account
for the very narrow
gene pool (read
single - celled organism) that the theory
of evolution begins with.
Blakemore argues that a
single gene mutation could in fact have been the cause
of this increase -
for in fact only one extra cell - division step would cause a doubling
of brain size.
In SIF - seq, hundreds or thousands
of DNA fragments to be tested
for enhancer activity are coupled to a reporter
gene and targeted into a
single, reproducible site in embryonic cell genomes.
In yeast,
for example, they've found that increasing the activity
of a
single gene, called Sir2, can significantly extend life span.
Now a
single gene is providing some answers, which should lead to a better understanding
of sudden infant death syndrome and sleep apnoea,
for example.
The disease results from a
single mutation in the
gene that codes
for one
of the protein chains that make up the hemoglobin molecule.
Alpha -1-antitrypsin deficiency (A1ATD) is the most common genetic disease
of the liver, and is caused by a
single nucleotide change in the
gene that codes
for alpha -1-antitrypsin (A1AT), an enzyme inhibitor that normally protects bodily tissues.
To generate the models, Jackson created two mutated versions
of the PrP - coding
gene by changing a
single codon — one
of the three - nucleotide «words» in
genes that code
for the various amino acids in proteins.
In the new study, the researchers sequenced the entire genome
of mice that had undergone CRISPR
gene editing in the team's previous study and looked
for all mutations, including those that only altered a
single nucleotide.
Working with this hypothesis, the researchers conducted a statistical analysis
of the CX3CR1
gene in over 7000 schizophrenia and autism patients and healthy subjects, finding one mutant candidate, a
single amino acid switch from alanine to threonine, as a candidate marker
for prediction.
«This work demonstrates the feasibility
of using a
single gene editing platform, plus the regenerative power
of stem cells to correct genetic mutations and restore dystrophin production
for 60 percent
of Duchenne patients,» said Pyle, associate professor
of microbiology, immunology and molecular genetics and member
of the Broad Stem Cell Research Center.
The findings provide proof
of principle that restoring the function
of a
single tumor suppressor
gene can cause tumor regression and suggest future avenues
for developing effective cancer treatments.
These multigene interactions are subtler and knottier than the
single gene drivers
of diseases such as hemophilia and cystic fibrosis; spotting them calls
for statistical inspiration and rigorous experiments repeated again and again to guard against introducing unproven
gene tests into the clinic.
Molecular geneticists dream
of having a similarly comprehensive view
of networks that control
genes:
For example, they would like to identify rules explaining how a
single DNA sequence can express different proteins, or varying amounts
of protein, in different circumstances (see p. 80).
And
for about 80 per cent
of genes, there is an exact,
single match in humans.
It is typically less expensive to get preselected information about the 20,000 or so
genes that make up a person's exome — the section
of the genome that provides instructions
for making proteins — than to perform a more precision - oriented test that targets a
single gene.
Sickle cell disease is a recessive genetic disorder caused by a
single mutation in both copies
of a
gene coding
for beta - globin, a protein that forms part
of the oxygen - carrying molecule hemoglobin.
Rare, deadly, and caused by a
single gene mutation, it was a perfect proof -
of - principle condition
for anyone seeking to replace damaged DNA with
genes that did the job.
«
Single gene encourages growth
of intestinal stem cells, supporting «niche» cells, and cancer: Finding in mice could lead to new therapies
for damaged organs, cancer.»
There is little dispute that genetics accounts
for a large amount
of the variation in people's intelligence, but studies have consistently failed to find any
single genes that have a substantial impact.
«What is so remarkable about dati is that females that are mutant
for just this
single gene can never decide to accept males, no matter how hard the males try to impress them» says Joseph Schinaman, a PhD student and first author
of the publication.
Now researchers have identified a
single gene, called fruitless (fru), as responsible
for the development
of male sexual behavior in the fly.
For Helicobacter pylori, a pathogenic bacterium that colonizes over 40 percent
of the world population and is associated with gastric cancer, the team discovered that epigenetic heterogeneity can quickly emerge as a
single cell divides, and different subpopulations with distinct methylation patterns have distinct
gene expressions patterns.
«By sequencing all
of the DNA that codes
for mRNA and ultimately, proteins, Dr. Amin and colleagues found a
single gene that may account
for as much as 4 %
of the heritable risk
for depression,» said Doctor John Krystal, Editor
of Biological Psychiatry.
«
For the first time, we can predict the outcomes
of modifying multiple
genes involved in lignin biosynthesis, rather than working with a
single gene at a time through trial and error, which is a tedious and time - consuming process,» says Jack Wang, assistant professor in NC State's College
of Natural Resources and lead author
of a paper about the research in Nature Communications.
A
single variation in the
gene for brain - derived neurotropic factor (BDNF) may influence obesity in children and adults, according to a new study funded by the National Institutes
of Health.
When a
single gene exists in the ancestral mutation, that would have made
for higher levels
of enzyme expression, would have messed up with sensory function.
«This treatment takes into account the entire genomic pattern, and shows that affecting a
single gene is not enough
for the treatment
of pancreatic cancer or any cancer type in general,» according to Prof. Satchi - Fainaro.
«We can't screen
for every possible disease
gene, which is another reason to limit the number
of offspring from a
single donor,» says Prof Sydsjö.
They have discovered that a
single amino acid difference in the structure
of histone H3.3 enables it to serve as a kind
of memory device
for the cell, marking
genes that need to remain active.
The authors also provide experimental validation
for using active genetics as an efficient means
for targeted
gene insertion, or «transgenesis,» and
single - step replacement
of genetic control elements.
By going
gene hunting in the Phenome Room, Jackson Laboratory scientists hope to steer their colleagues away from the search
for single genes in favor
of hunting
for gene networks.
Single - cell differential
gene expression analysis revealed a spectrum
of known transcripts, including several linked to cytotoxic and costimulatory function that are expressed at higher levels in the TEMRA (effector memory T cells expressing CD45RA) subset, which is highly enriched
for CD4 - CTLs, compared with CD4 + T cells in the central memory (TCM) and effector memory (TEM) subsets.
With the completion
of the first phase
of the Human Genome Project in 2000, and the advent
of sequencing technologies that can detect
gene variations such as
single nucleotide polymorphisms (SNPs),
for the first time scientists have the tools in hand to find the key immune
genes and genetic networks that play roles in vaccine response.
The team found that a
single polymorphism (a difference in one «letter»
of the sequence) in the BDNF
gene accounted
for significant differences in intelligence among those with similar injuries and comparable intelligence before being injured.
«First, there is no
single road map to eusociality — the complex, cooperative social system in which animals behave more like superorganisms than individuals fending
for themselves,» said
Gene Robinson, a lead on the study who is a professor
of entomology and director
of the Carl R. Woese Institute
for Genomic Biology at the University
of Illinois.
«
For the first time we've found that almost every complex disease has a unique set
of associations with
single -
gene diseases.
Hereditary predisposition to cancer is sometimes due to a
single high - risk genetic change, like a mutation in the BRCA1 or BRCA2
genes for breast cancer, but most
of the time, the disease is the result
of multiple
gene variants that add up, environmental risk factors, and a big element
of chance.
He has worked in the biotech industry as a research scientist
for over 11 years with a focus on emerging technologies including
gene targeting in mice, molecular analysis
of transgenes using GFP variants at the
single cell level, and developing flow cytometry reagent kits to speed up assay development time
for researchers.
The absence
of a
single gene tree identical to the avian species tree is consistent with studies in yeast (82), indicating that phylogenetic studies based on one or several
genes, especially
for rapid radiations, will probably be insufficient.
«
For species that have a very rapidly changing environment, this process
of co-option
of single genes may be fairly important.
The study, published in Nature Genetics, offers the possibility that targeting these processes, instead
of single genes, may provide new opportunities
for treatment
of Wilms tumor.
A
single injection
of a new treatment has reduced the activity
of the
gene responsible
for Huntington's disease
for several months in a trial in mice.
An alteration in the neuregulin - 1
gene — a
single change in one letter
of the DNA code
for the protein — has been found in families with schizophrenia and linked to late - onset Alzheimer's disease with psychosis.
Brandis and Hughes changed many different codons and showed that changing even a
single codon in the
gene for this protein into any one
of the alternative «synonymous» codons reduced the «fitness»
of Salmonella.
For each
gene, the researchers compared the number
of single letter mutations that alter the encoded protein versus silent mutations that have no effect.
Instead, Werren likened the functionality
of these
single - copy
genes to «moonlighting»
for extra cash, with the
genes taking on a «night job» in the venom gland in addition to their «day job» elsewhere in the body.
As a postdoc in the lab
of Zefeng Wang, PhD, a member
of the UNC Lineberger Comprehensive Cancer Center, Choudhury stumbled upon DAZAP1 while searching
for proteins involved in alternative splicing — when a
single gene organizes its genetic code to create different proteins with various functions.