Of these, 43 people carried at least one
copy of the gene variant.
We screened a total of 394 Amish research subjects for the KCNH7 mutation; 84 of these individuals carried at least one
copy of the gene variant, and the lifetime incidence of bipolar spectrum disorders among them was 49 percent (41 people were affected with the disease).
The researchers found that people who have more
copies of the gene variants (by inheriting a copy of each advantageous variant from both parents), had the least amount of oxygen in their blood and used it more efficiently than people without either variant, or only one copy from one parent.
Tests may be ordered specifically looking for carrier status, identifying people who carry one
copy of a gene variant that can be passed on to a child.
About 35 % of Americans have one or two
copies of this gene variant, inherited from one or both parents.
If you have two
copies of this gene variant, you metabolize caffeine much slower than «fast» caffeine metabolizers.
Not exact matches
Since all people have two
copies of every
gene, combinations
of the TAS2R8
gene variants determine whether someone tastes bitter foods intensely.
But a faulty
variant of this
gene arose six generations ago in an Amish group, causing the people who carry one
copy of the
variant to produce half as much
of the age - promoting protein.
The researchers looked at a type
of genetic change called
copy number
variants, which refers to the number
of copies of genes in human DNA.
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.
Participants carrying two
copies of one
variant within the PRKCA
gene, dubbed the A allele, remembered the most details about the pictures.
Having only one
variant copy of the
gene gives people the appearance
of looking about one year older on average, the team
of Dutch and British researchers concluded.
Birds that have two
copies of the large - beak
variant of the
gene have big beaks, while two
copies of the small - beak
variant produce little beaks.
Having just one
copy of a particular
variant of a
gene called CREBRF is associated with a 1.5 increase in BMI.
More than one quarter
of children with two
copies of a high - risk
variant in a specific group
of genes develop an early sign
of celiac disease called celiac disease autoimmunity (CDA) by age 5.
Results from the analysis confirmed previous findings
of some
copy number
variants already associated with autism, but they also found a host
of other
genes (SHANK2, SYNGAP1, DLGAP2 and the X chromosome — linked DDX53 - PTCHD1 locus) in which mutations seem to be linked to autism.
People who have one
copy of the APOE
gene variant e4 have a three times greater risk
of developing AD.
Affected individuals do not have a disease: they only carry 1
copy of a hemoglobin
gene variant, and unlike individuals with 2
copies of the
variant, they do not experience symptoms.
Those differences led to lower levels
of the IFITM3 protein in ndividuals with two
copies of the high - risk
gene variant compared to other patients, researchers said.
For the new mouse model, the researchers exposed adolescent mice with at least one
copy of a
variant of the BDNF
gene, which has been associated with anorexia and anxiety in mice and humans, to social stress and caloric restriction.
The authors conclude that valproate may be effective for treating negative symptoms in psychiatric patients with two
copies of the «Val»
variant of the COMT
gene, which breaks down dopamine in the brain.
But a faulty
variant of this
gene arose six generations ago in an Amish group, causing the people who carry one
copy of the
variant to produce half as much
of the protein.
A few people turned out to have either the Amish APOC3 mutation or one
of three other
variants in APOC3 that also disable this
copy of the
gene.
The researchers also found that these
copy number
variants occurred more frequently in
genes involved in the function
of synapses, the connections between brain cells that transmit chemical messages.
A
copy number
variant may affect dozens
of genes, or it can disrupt or duplicate a single
gene.
In this study, the authors assessed the impact
of SNPs, inherited
copy number
variants (CNVs), and acquired
copy number alterations (CNAs) on the
gene expression landscape.
The investigators found that people who carry a single
copy of the KL - VS
variant of the KLOTHO
gene, roughly 20 percent
of the population, have more klotho protein in their blood than non-carriers.
The researchers found that people who carry a single
copy of the KL - VS
variant of the KLOTHO
gene perform better on a wide variety
of cognitive tests.
Until now, however, individuals who are born with defective
copies of the
gene (germline
variants) have been found extremely rarely, only in families with cancer predisposition syndromes, Li Fraumeni syndrome (LFS) and Li - Fraumeni - like syndrome (LFL).
In this study, Teitell and his team sought to determine
copy number
variants (CNVs), or differences in the numbers
of certain
genes, in two embryonic stem cell lines.
Using DECoN (which stands for Detection
of Exon
Copy Number
variants), the researchers took advantage
of the high density
of sequencing data available in new
gene panels to accurately detect deletions or duplications
of exons.
A carrier for a recessive condition is asymptomatic and has a pathogenic genetic
variant in just one
of their two
copies of the associated
gene.
«The
variant that we discovered is common: Most people have one or two
copies of the version
of the
gene that is linked to accumulating more pathology as you get older,» said lead author Dr. Lori Chibnik
of Brigham and Women's Hospital.
In an individual with a recessive disease, both
copies of the
gene have
variants associated with disease.
This section invites manuscripts describing (a) Linkage, association, substitution or positional mapping and epigenetic studies in any species; (b) Validation studies
of candidate
genes using genetically - engineered mutant model organisms; (c) Studies focused on epistatis and
gene - environment interactions; (d) Analysis
of the functional implications
of genomic sequence variation and aim to attach physiological or pharmacogenomic relevance to alterations in
genes or proteins; (e) Studies
of DNA
copy number
variants, non-coding RNA, genome deletions, insertions, duplications and other single nucleotide polymorphisms and their relevance to physiology or pharmacology in humans or model organisms, in vitro or in vivo; and (f) Theoretical approaches to analysis
of sequence variation.
Molecular profiling
of large tumour numbers has also allowed the annotation
of more than 13 million non-coding mutations, 18 029
gene fusions, 187 429 genome rearrangements, 1 271 436 abnormal
copy number segments, 9 175 462 abnormal expression
variants and 7 879 142 differentially methylated CpG dinucleotides.
By performing a meta - analysis
of rare coding
variants in whole - exome sequences from 4,133 schizophrenia cases and 9,274 controls, de novo mutations in 1,077 family trios, and
copy number
variants from 6,882 cases and 11,255 controls, we show that individuals with schizophrenia carry a significant burden
of rare, damaging
variants in 3,488
genes previously identified as having a near - complete depletion
of loss -
of - function
variants.
By analyzing genome sequence data from human populations, including 1269 individuals from sub-Saharan Africa, we identify a diverse array
of large
copy number
variants affecting the host invasion receptor
genes GYPA and GYPB We find that a nearby association with severe malaria is explained by a complex structural rearrangement involving the loss
of GYPB and gain
of two GYPB - A hybrid
genes, which encode a serologically distinct blood group antigen known as Dantu.
These folks carry two
copies of a
variant of the MC1R
gene, which determines our hair and skin color.
You can blame your DNA: In a Current Biology study published last year, Dutch researchers found that adults who carried two
copies of the MC1R
gene variant typically appeared two years older than other white adults
of the same age.
Evidence for multiple
copies of the salivary amylase
gene in high starch eating Asians, and a
gene variant that is important for breaking down fats in plant foods in Europeans and Middle Easterners may reflect an adaption to agriculture (Hancock et al, 2010).
The Curly Hair test: The Curly Hair test allows one to determine the genotype
of a tested dog as being normal / clear
of the KRT71 mutation (i.e. having two
copies of the normal
gene); a carrier
of one
copy of the mutation; or a homozygote for the KRT71 mutation (i.e. having two
copies of the mutant
variant).
Each pup that is born to a dog with the harlequin coat color has a 50 % chance
of inheriting one
copy of the PSMB7
gene variant (H) and having a harlequin coat color.
Puppies with two
copies of the PSMB7
gene variant (H / H) most likely die very early in gestation; therefore, breeding two dogs with harlequin coat color (H / h) may result in reduced litter size.
A dog with two
variant copies of the MLPH
gene will have a blue, charcoal, Isabella (lilac) or fawn coat color depending on the other coat color
genes present in the individual.
The study researchers found some 30 percent
of Labrador retrievers carry the mutant
gene though they may not show symptoms since they don't carry two
copies of the dynamin 1
variant.