As
with gene sequences, public databases house results from many large - scale array experiments that serve as useful comparative information for other researchers.
As the name suggests, ecRNA partially overlaps
with a gene sequence that produces messenger RNA; but it also includes RNA sequences from DNA beyond the gene boundary.
Not exact matches
That's not to say
gene editing is new (it isn't), but Crispr simplifies the process by using molecular scissors that can be precisely targeted to snip out aberrant regions of genetic code, which can then be replaced
with the correct
sequences.
With respect to antibiotic resistance, this novelty can be induced and we can trace the novelty to particular mutations arising absent
gene transfer; i.e. the
genes which give rise the resistance were not present prior to the mutation, they are new
sequences and not simply the activation of dormant
genes.
A separate genetics adviser will review, support and identify potential linkages in the genetics component of methane mitigation, including genomics (work on recombinant DNA and
gene sequencing) and genetic interaction
with environment.
This dataset contains millions of genomic
sequences from a diverse set of rice varieties that, when combined
with phenotyping observations,
gene expression, and other information, provides an important step in establishing
gene - trait associations, building predictive models, and applying these models to breeding.
The CRISPR approach is very good at disabling
genes, but using the technique to fix them is much harder, because it involves replacing a faulty
sequence with another.
For their experiments, the researchers created hybrids of two genetically distinct mouse strains
with a fully
sequenced genome, allowing
gene variants to be clearly assigned to the maternal or paternal allele.
The vaccine can be targeted to the chosen pathogen by using RNA molecules which share
sequence identity
with the pest's
genes and prevents their expression.
Using Atlantic killifish (Fundulus heteroclitus), the researchers examined whether mitochondrial - nuclear interactions alter the frequency of alternative forms of a
gene that arise by mutation, called alleles, for over 11,000 nuclear DNA
sequence variations within a population of the fish
with mixed ancestry.
In the new research, the UB scientists found they could reverse those social deficits
with a very low dose of romidepsin, which, they found, restores
gene expression and function using an epigenetic mechanism, where
gene changes are caused by influences other than DNA
sequences.
An international team led by researchers
with the Lawrence Berkeley National Laboratory (Berkeley Lab) has developed a new technique for identifying
gene enhancers —
sequences of DNA that act to amplify the expression of a specific
gene — in the genomes of humans and other mammals.
A transgenic mouse — one
with foreign
genes swapped into its DNA — poses
with its own
gene sequence at Harvard Medical School.
I remember looking at the report and realizing that there were all of these similar
genes in all of these different animals and thinking: «Maybe a careful reading of the papers associated
with the
sequences most similar to mine will tell me something about my own
gene.»
Using
gene sequencing tools, scientists from Johns Hopkins Medicine and the University of British Columbia have found a set of genetic mutations in samples from 24 women
with benign endometriosis, a painful disorder marked by the growth of uterine tissue outside of the womb.
Night after night Rienhoff tediously compared his daughter's DNA
sequence with reference
sequences stored in several major genomic databases — Ensembl, Heidelberg, and the UCSC Genome Bioinformatics
gene bank, among others.
The inserted DNA both knocks out the
gene and, along
with some adjacent mouse DNA, becomes a unique
sequence tag marking that
gene.
The team found that humans are equipped
with tiny differences in a particular regulator of
gene activity, dubbed HARE5, that when introduced into a mouse embryo, led to a 12 % bigger brain than in the embryos treated
with the HARE5
sequence from chimpanzees.
With the successful completion of genome -
sequencing projects, science's knowledge of
genes and proteins has increased exponentially.
Brains of individuals who died
with Huntington's, Parkinson's or no neurological condition were analyzed using
sequencing technology that provides a data readout of the activity of all
genes in the genome.
However, the results of more recent phylogenetic analyses, derived from comparisons between
sequences of specific
genes and of whole genomes, seemed to point to Ctenophora as the first group that parted company
with the lineage from which the rest of the animal kingdom (including sponges) evolved.
The idea of «reversal drives,» which would overwrite mutated
genes with the original
sequence, often arises as a promising solution to
gene drives gone wild.
Genes in Space - 1 marked the first time the PCR was used in space to amplify DNA
with the miniPCR thermal cycler, followed shortly after by Biomolecule Sequencer, which used the MinION device to
sequence DNA.
The team
sequenced the
gene that codes for the NaV1.7 channel in mole rats, and compared it
with SCN9A — a key
gene in the human version of the channel.
A Canadian project called FORGE (finding of rare disease
genes) aims to
sequence children and families
with 200 different disorders this year.
Lu's team will extract immune cells called T cells from the blood of the enrolled patients, and then use CRISPR — Cas9 technology — which pairs a molecular guide able to identify specific genetic
sequences on a chromosome
with an enzyme that can snip the chromosome at that spot — to knock out a
gene in the cells.
Next, he synthesised 50,000 DNA strands
with sequences that almost matched parts of the 24
genes involved in lycopene production, but
with a range of variations that he hoped would affect the amount of lycopene produced.
Using metabolic function analyses of identified
genes, we compared our human genome
with the average content of previously
sequenced microbial genomes.
With epigenetics we mean such changes in
genes that are not determined by changes in the actual DNA
sequence, but effects that are superimposed on this, caused for example by environmental effects.
In a 1995 Science paper, Venter's team
sequenced the genome of Mycoplasma genitalium, a sexually transmitted microbe
with the smallest genome of any known free - living organism, and mapped its 470
genes.
«
Gene sequencing has opened a huge door to how complex these communities are,» says Patrick Seed, a Duke pediatrician specializing in infectious disease, who
with biologist Rob Jackson is a lead investigator of the premature infant study.
This is the most complete and accurate bread wheat genome assembly to date
with 91 per cent (98,974
genes) of the total genome annotated and assembled — a total
sequence length of 13.4 GB.
They
sequenced the
gene coding for the receptor in patients
with either severe skin allergies or hyper - IgE syndrome, a rare condition in which the body produces too much IgE.
The map allows
gene hunters to get away
with less (and thus cheaper) DNA
sequencing while still, it's hoped, homing in on disease
genes.
The AcrA - PPMO also was effective against the human pathogens Klebsiella pneumoniae and Salmonella enterica, since those bacteria contain the same efflux pump
with a matching
gene sequence, Dr. Greenberg said.
But by investigating the DNA
sequence around the resistance
genes, the team figured out how the resistance
genes transfer occurred through a new mechanism named «carry back,» where the pathogen basically has a primitive form of «sex»
with the Actinobacterium and takes up its resistance
genes after it dies.
But the benefits of this technology for discerning the circuits of the mind go much deeper, because the virus that carries the photoreceptor
genes can also carry promoter
sequences that express their payload only in neurons
with the appropriate molecular address.
New genome -
sequencing research suggests white European people
with two copies of variant forms of MC1R, a
gene linked to pale skin and red hair, have faces that appear up to two years older than those who are the same age but don't have both copies.
Before the consortium came together, he had participated in
sequencing the genomes of two vocal learners, a songbird and a parrot, but he knew he couldn't do all of the additional
sequencing and analysis work that would be required to identify
genes related to vocal learning — not by himself, at least — so he teamed up
with Genome 10K, a project aiming to collect genomes for 10,000 vertebrate species.
Gene sequencing revealed two regions associated
with major depressive disorder on one of the 23 pairs of chromosomes.
Using a novel combination of technologies, including trio exome
sequencing of patient / parental DNA and genetic studies in the tiny larvae of zebrafish, the EuroEPINOMICS RES consortium found that mutations in the
gene CHD2 are responsible for a subset of epilepsy patients
with symptoms similar to Dravet syndrome — a severe form of childhood epilepsy that is in many patients resistant to currently available anti-epileptic drugs.
So to reveal their function, biologists used the
sequence information along
with a technique called RNA - mediated interference (RNAi) to temporarily inactivate each of nearly 17,000 of the worm's
genes.
In the case of β - ionone, the smell associated
with violets, McRae and colleagues managed to pinpoint the exact mutation (a change in the DNA
sequence) in the odorant receptor
gene OR5A1 that underlies the sensitivity to smell the compound and to perceive it as a floral note — people who are less good at smelling β - ionone also describe the smell differently, as sour or pungent, and are less likely to find it pleasant.
Three years ago, they
sequenced B. theta's entire genome, which enabled them to work
with a
gene chip that detects what proteins are being made at any given time.
With such long stretches of DNA, Hung and his team could assess the extent to which the
sequences of DNA code in the
genes in the three specimens varied from bird to bird.
New, sophisticated
gene sequencing techniques are leading to an increasing understanding of the causes of genetic disease, and can help parents
with affected children make informed reproductive choices, the annual conference of the European Society of Human Genetics will hear.
But critics warn that genetic engineering has a dark side too, and could lead to designer babies or the release of dangerous DNA
sequences into the
gene pool,
with dire environmental consequences.
«Single - nucleus RNA
sequencing, droplet by droplet: DroNc - Seq, technology that merges single - nucleus RNA
sequencing with microfluidics, brings new scale to
gene expression studies in complex tissues.»
Pryer's team began a crowdfunding project
with the help of the online site Experiment.com, hoping to gain $ 15,000 to
sequence the fern's
genes.
The researchers from Queen Mary University of London
sequenced the HAS2
gene in thirteen similar or related mammals, combining the data
with DNA
sequences extracted from 57 published genomes representing all the major mammal groups.