Articles tagged with Human Genetics
Researchers found that coevolution between humans and H. pylori bacteria reduced gastric cancer risk in people of African descent, but not in Amerindian descent. The study suggests that the interaction between H. pylori and human ancestry influenced disease risk, with high African-strain infection leading to worse outcomes.
Researchers have found that the Y chromosome retains key genes essential for male fertility, contradicting theories of its demise. The study, which analyzed Y chromosomes in African and European men, suggests that natural selection has played a crucial role in maintaining the gene content on the Y chromosome.
The human Y chromosome contains unique genes that have likely been maintained by selection, suggesting it will stick around despite its small size. Genetic diversity on the Y chromosome is low, but researchers found that natural selection, particularly purifying selection, also contributed to this low diversity.
Researchers found that individuals with the Met/Met genotype of the COMT gene performed better in a simulated air-defense task than those without this genotype. The study suggests that matching training to individuals based on their cognitive abilities could be more important than other factors in personnel selection.
A new study compares the relative rate of molecular evolution between humans and chimps with that of their lice. The researchers found that the lice are winning the molecular evolutionary race, with almost 15 times more changes in gene sequence.
New research confirms Ardi's close evolutionary relationship to humans, revealing a pattern of similarity linking it to Australopithecus and modern humans. The study shows that the human cranial base pattern is at least a million years older than previously thought, with implications for our understanding of human evolution.
Researchers at the University of Melbourne have identified a genetic marker that signals increased susceptibility to emerging influenza strains. This breakthrough allows clinicians to develop early intervention strategies for high-risk patients.
Researchers at Karolinska Institutet have identified a new gene, GRHL3, responsible for the most common form of cleft lip and palate syndrome, Van der Woude syndrome. The study found that mutations in GRHL3 may be associated with an increased risk of clefts in non-syndromic cases.
The Neanderthal genome shows a long history of interbreeding among early humans in Europe and Asia, with an estimated 1.5-2.1% of modern non-African genomes tracing back to Neanderthals. The study also reveals Denisovan genes in modern human populations, particularly in Oceanic and Asian groups.
A Neanderthal DNA region associated with UV-light adaptation has been identified in up to 49% of Japanese and 66% of Southern Chinese populations. This region was positively selected and enriched in East Asians due to a population expansion event, suggesting higher levels of Neanderthal ancestry in the region.
A research team has discovered a second rare genetic mutation that strongly increases the risk of Alzheimer's disease in later life. The mutation is found in the Phospholipase D3 (PLD3) gene, which influences amyloid precursor protein processing and may be a potential therapeutic target.
Researchers at Virginia Commonwealth University have identified a key gene interaction that could be harnessed to treat various cancers. The study found that forced expression of MDA-7/IL-24 stimulates SARI expression in an autocrine/paracrine loop, causing cancer cells to undergo apoptosis.
A recent study has found that great white sharks have more similar proteins to humans than zebrafish, which challenges current understanding of their evolution. This discovery opens up new avenues for studying shark metabolism and biochemistry, potentially revealing insights into the biology of mammals as well.
Researchers at St. Jude Children's Research Hospital found avian H2N2 influenza A viruses from the 1957-1958 pandemic can infect human cells and spread among ferrets, posing a risk to those under 50 who lack immunity to the virus
A research team at the University of Bonn discovered a novel receptor that allows the immune system to recognize dangerous invaders and elicits an immune response. This receptor is found in Europeans but not in early men, suggesting it was inherited from Neanderthals.
Researchers identified epigenetic disruption of a small non-coding RNA pathway as a hallmark for testicular tumor development. This aberration compromises the function of these RNAs, contributing to cellular transformation.
A genetic defect in the FoxP2 gene, commonly associated with human speech problems, disrupts the ability of songbirds to sing effective courtship tunes. Researchers found that the defect impairs a network of nerve cells, leading to stuttering and stammering in affected individuals.
Scientists found two human proteins, UPF1 and PCNA, that interact with a jumping gene called L1. The study reveals how these interactions affect the movement of L1 within the human genome, providing new insights into the regulation of this volatile DNA segment.
A new study published in Human Genetics found that 180 DNA variants predict tall stature in Europeans with an accuracy of 0.75.
Researchers identified a novel avian-origin H6N1 virus that closely resembles chicken H6N1 viruses circulating in Taiwan since 1972. The virus has a mutation that could increase its preference for human SAα-2,6 receptors, making it more infectious to humans.
A recent study by Gladstone researchers reveals that specific stretches of DNA, called human accelerated regions (HARs), control the development of uniquely human characteristics. HARs were found to be crucial in human ancestors becoming distinct from our closest primate relatives.
A new study reveals that edited RNA and invasive DNA contribute to individual variation in humans by regulating gene expression. The study found a 20% difference in life span and eye color between individuals with varying levels of ADAR activity.
A UCSF scientist suggests that complex gene expression mechanisms in humans may have evolved to counter viral infections, rather than for overall organism development. This idea challenges conventional wisdom about the evolution of eukaryotic cells.
Research shows that chronic stress alters gene expression in immune cells, making them pro-inflammatory and prone to excessive inflammation. This can lead to various health issues, including cardiovascular diseases, diabetes, and obesity.
Researchers at the Weizmann Institute of Science have successfully created induced pluripotent stem cells (iPS cells) that can be kept in a pristine state, paving the way for growing transplant organs to order. The breakthrough enables the production of 'humanized' mouse models containing human-derived tissues.
Researchers used gene sequencing to map bacterial communities on two human cadavers, finding differences and changes over the decomposition process. The study suggests specific patterns in bacterial communities as a corpse decomposes.
A recent study identifies a genetic root to childhood obesity, revealing that patients with mutations in the KSR2 gene have an increased appetite and slower metabolism. The findings suggest that drugs like metformin could provide new treatment options for obesity and type-2 diabetes.
Researchers at Berkeley Lab identified thousands of enhancer sequences involved in craniofacial development, which regulate genes to fine-tune facial morphology. The study provides insights into the genetic drivers of normal craniofacial variation and may lead to better diagnostic and therapeutic approaches for birth defects.
Scientists identify correlation between genetic variation and microbiome composition, suggesting role of host immunity in bacteria levels across the body. The study highlights the complex interaction between human genetics and the microbiome, with potential implications for disease susceptibility.
A study of herpes simplex virus type 1 confirms the 'out-of-Africa' pattern of human migration, with African isolates clustering together and Asian viruses grouping based on sequencing of human genomes. The findings support existing analyses of human migration and provide insights into how organisms are related.
Researchers suggest that Denisovans, an ancient human relative, successfully crossed Wallace's Line, a powerful marine current, to interbreed with modern humans. This finding opens up questions about the behaviors and capabilities of this group and how far they could have spread.
A new method developed by researchers at the University of Zurich allows them to display viral DNA in host cells at single-molecule resolution, revealing unexpected insights into its distribution and cell response. The technique uses click chemistry to label viral DNA without affecting its biological functions, enabling scientists to s...
A recent molecular biology study suggests a significant reduction in population sizes of common ancestors of humans and chimpanzees, from 1.2 million to 30,000, coinciding with a great ape ancestral migration event from Eurasia to Africa.
Human skin stem cells have been found to possess a natural internal clock, which helps them regulate functions such as UV protection in response to circadian changes. This finding could lead to new strategies for preventing premature aging and cancer.
A new study by University of British Columbia researcher finds that some people are genetically predisposed to see the world darkly due to a previously known gene variant. The ADRA2b deletion variant influences norepinephrine levels, affecting real-time perception and emotional memory formation.
Scientists have developed a new method to visualize gene activity in single cells, revealing strong variability in gene expression and spatial organization between cells. The method allows for the parallel measurement of gene activity and transcript molecules in thousands of single cells, providing novel insights into cell behavior.
Researchers from the University of Sheffield and Mario Negri Institute in Italy investigated two mouse models of MND, identifying key differences in gene expression that may help predict disease duration. The study provides new insights into mechanisms that slow down disease progression.
The study identifies syndecan-1 as the human cell receptor used by baculovirus to enter cells, shedding light on the mechanisms of infection and facilitating gene therapy development. This breakthrough discovery increases our understanding of baculovirus interactions with human cells.
Research shows that genetic factors and dietary choices interact to shape the microbiome in the host intestine. This combination determines the presence and activity of specific microbes, which can affect digestive health and increase the risk for conditions like Crohn's disease.
Researchers at NIST and Applied Research Associates developed a microfluidic technique to recover DNA from complex mixtures like dirt. This method delivers optimal DNA concentrations for human identification procedures, potentially miniaturized for use outside the laboratory.
The EMBO Meeting 2013 conference will feature keynote lectures by prominent scientists, including Kai Simons, Hans Clevers, Sir Michael Stratton, Peter Hegemann, and Georg Nagel. The scientific programme will include sessions on stem cells, cancer genomics, optogenetics, and the search for life beyond Earth.
Mycobacterium tuberculosis originated in Africa at least 70,000 years ago. The bacteria have a strikingly close genetic match with humans, suggesting a long history of co-evolution. This has led to the development of new strategies for disease control and may help predict future patterns of the disease.
A team of geneticists identified five different alleles in the Ethiopian population that cause adult lactase production, highlighting a soft selective sweep. This phenomenon allows individuals to digest milk via different mutations, increasing their chances of survival under scarce food conditions.
A new study finds Arrhythmogenic Right Ventricular Cardiomyopathy, a human heart disease, in chimpanzees. The condition was detected in two half-brother chimps who died suddenly during physical exertion at a UK zoo.
Researchers have made a breakthrough in genome editing technology, enabling precise control over genetic changes in fruit flies. The CRISPR RNA/Cas9 system allows for targeted mutations and gene expression manipulation, opening up new possibilities for studying human diseases and developing gene therapies.
Researchers at Whitehead Institute created mouse models of two neurodegenerative diseases that are fatal in humans. The highly accurate reproduction of disease pathology seen with these models should advance the study of prion diseases, including Creutzfeldt-Jakob disease and fatal familial insomnia.
Scientists sequenced entire genomes of high-altitude individuals and found 11 regions with significant differences between those with chronic mountain sickness and healthy controls. The study identified two genes, SENP1 and ANP32D, which were expressed more in individuals with the condition in response to low oxygen levels.
San Diego State University researcher Sandy Bernstein receives $3.5m NIH grant to model human muscle diseases in fruit flies. His team uses genetically altered flies with engineered myosin protein mutations to better understand the effects on human health.
A study found that MRSA strains in humans originated from cattle, with a 40-year timeline for the emergence of resistance to methicillin. The bacteria's genetic analysis revealed that bovine strains were closer to the root of the phylogenetic tree, indicating a common ancestor.
A recent genetic study has uncovered a significant demographic shift in India's population, occurring approximately 1,900-4,200 years ago. This mixture of ancestral populations has left its mark on nearly every group in India, influencing the present-day caste system and increasing the incidence of genetic diseases.
HSCI researchers mapped nearly all cytosine-guanine pairs in human DNA and found that only a small fraction are dynamic, playing a key role in regulating gene expression. The study improves current approaches to mapping epigenetic marks and sheds light on how genes are controlled in different cell types.
Researchers at Michigan State University have discovered that genetic mutations interact with an individual's genome background about 75% of the time, affecting disease outcomes. This finding has significant implications for understanding and treating diseases with a simple genetic basis, such as breast cancer.
A new study using Y chromosome DNA sequencing sheds light on human ancestry by tracing the male lineage back to a common ancestor between 120,000 and 156,000 years ago. This timeframe agrees with previous findings on the female most recent common ancestor, providing significant insights into human history and migration patterns.
A recent study found that male Holocaust survivors lived an average of 14 months longer than non-survivors, with a significant difference in life-expectancy among men aged 10-20 during the war. The researchers suggest that the 'Posttraumatic Growth' phenomenon may have contributed to their longevity.
A study published in PNAS reveals that the human herpes virus uses histone proteins to package and store its genetic material, allowing it to remain dormant. Researchers identified a viral protein called IE1 as a potential target for new therapies to control the virus's activity.
Research suggests that inherited Human Herpesvirus 6 may be a root cause of CFS, causing cognitive dysfunction and fatigue. Antiviral drug therapy improves severe neurological symptoms in affected patients.
Scientists have discovered that a pressure-driven infection mechanism used by the herpes simplex virus 1 causes it to inject its genetic material into human cells. This technique could be targeted for future treatments to defeat HSV-1 and other viruses, potentially limiting drug resistance.
A new small animal model of the human norovirus has been developed, allowing researchers to study the virus and develop potential antiviral treatments. The model was created by infecting 'humanized' mice with the virus and identified macrophages as the cell type infected by the virus.
A new study has found a link between high levels of arsenic in rice and elevated genetic damage in humans. Researchers discovered that people consuming rice with more than 0.2 mg/kg arsenic showed higher frequencies of micronuclei, a sign of chromosomal damage.
U of M researchers identified infection-fighting and inflammation-suppressing functions for the PTPN22 gene, which could impact treatment strategies for autoimmune diseases. The study found that a variant of PTPN22 impacts immune system function in health and disease.