Articles tagged with Mitochondrial Dna
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A team of biologists has discovered a male-harming DNA mutation in fruit flies that reduces fertility in males as they age. The study confirms the 'mother's curse' hypothesis, which suggests that moms may transmit genes to their children that harm their sons but not their daughters.
Scientists at UC Davis reveal how cells control DNA synthesis in mitochondria and couple it to mitochondrial division. This fundamental discovery has far-reaching implications for understanding cell functions, aging, and a range of diseases.
Researchers at Vanderbilt University discovered that mutant mtDNA behaves 'selfishly', benefiting itself while harming its host, causing diseases. The study found molecular mechanisms that allow mutant mtDNA to evade cellular regulation, paving the way for drug development.
Scientists have uncovered how the combination of nuclear and mitochondrial genomes triggers a cellular adaptation that determines aging. The study provides valuable information on using mitochondrial donation technology to prevent disease-causing mutations.
Researchers found that mitochondrial stress triggers metabolic shifts through the p53 protein in cancer cells, leading to increased glycolysis and possible new targets for therapy. The study suggests that markers of metabolic stress could serve as a biomarker for cancer aggressiveness.
A new approach to embryo assessment uses mitochondrial DNA quantification to identify viable embryos in IVF treatments. Studies have shown that embryos with unusually high levels of mitochondrial DNA rarely implant, supporting the use of this method as a marker of embryo viability.
The US policy on mitochondrial replacement therapy (MRT) is at a standstill due to a contradiction between the National Academies' recommendation and a legislation enacted by President Obama's administration. MRT aims to replace disease-causing mitochondrial DNA in human embryos, providing new cures for previously untreatable conditions.
Researchers have discovered a new IVF-based technique that significantly reduces the risk of mitochondrial disease in babies. The 'early pronuclear transfer' method involves transplanting healthy mitochondria into an embryo created using conventional IVF.
A study published in Cell Stem Cell found that small amounts of mitochondrial DNA can override the mitochondria in donor cells after nuclear transfer, raising concerns about the therapy's safety and effectiveness. The researchers are now exploring strategies to avoid this carryover and ensure complete mitochondrial DNA replacement.
A study on the 'canine transmissible venereal tumour' reveals how this contagious cancer, dating back to 11,000 years ago, has spread across the globe by 'stealing' DNA from its host. The research shows that cancer cells can shuffle or recombine DNA from different mitochondria.
A new study found that more than 1,000 sperm whales have a mitochondrial DNA profile from a single 'Eve' ancestor tens of thousands of years ago. The females in this ancestral lineage are responsible for shaping the global population structure, showing strong fidelity to local areas.
Researchers have sequenced the mitochondrial genome of the Hispaniolan solenodon, revealing that it diverged from other living mammals 78 million years ago. The venomous mammal survived asteroid impact and human colonization, but is now threatened by habitat loss and introduced predators.
Researchers found that SLE neutrophils release oxidized mitochondrial DNA, stimulating type I interferon production and contributing to disease pathogenesis. Targeting pathways for oxidized DNA degradation may offer new treatment options for chronic autoimmune disease.
A recent study has found that induced pluripotent stem (iPS) cells derived from patient skin cells may contain faulty mitochondrial DNA mutations, which could undermine their therapeutic value. Screening and checking for mitochondrial DNA mutations is crucial to ensure the quality of iPS cell lines intended for therapeutic use.
A study by researchers at UC Davis MIND Institute found that a cancer gene is nearly twice as likely to be defective in children with autism spectrum disorder and their fathers. The correlation is particularly high among children with more severe ASD, suggesting a link between DNA repair capacity and genomic instability.
Fossils from the Sima de los Huesos site in Northern Spain have provided genetic evidence that they belonged to early Neandertals. The analysis of nuclear DNA from two specimens has shown a close relationship with Neandertals, contradicting previous findings based on mitochondrial DNA.
The US medical community will play a key role in determining the ethically acceptable path forward for clinical application of mitochondrial replacement techniques (MRTs). MRTs aim to prevent certain debilitating diseases related to mutated mitochondrial DNA by replacing a mother's mtDNA with that of another woman. The first use of MRT...
Emerging genetic tools for mitochondrial DNA replacement offer the potential to prevent a multi-system genetic disease, but also raise questions about unintended risks to children and their descendants. The tools aim to prevent mother-to-child transmission of mitochondrial DNA disease.
A study by a team of geneticists found that only 22% of Panamanian men have Y-chromosomes originating from Native American ancestors, while 60% have Eurasian origins. This suggests the Spanish conquest had a lasting impact on the region's gene pool.
Researchers use ancient DNA to confirm that extinct glyptodonts were indeed enormous armadillos. The study reveals that these prehistoric creatures evolved from medium-sized forms to become true megafauna over millions of years.
Mitochondrial genes are retained to build organelle structure, resist damage from free radicals, and facilitate energy production. This design allows mitochondria to withstand the extreme environment and maintain their independence from the nucleus.
Detailed genetic analysis reveals mitochondrial DNA was present in Island Southeast Asia 11,500 years ago, challenging the 'Out of Taiwan' theory. The linguistic spread of Austronesian languages is attributed to elite groups and cultural exchange, rather than mass migration.
A study found that high levels of mitochondrial DNA in the blood are associated with a lower risk of developing chronic kidney disease (CKD). The researchers analyzed data from over 9,500 participants and discovered that individuals with higher mitochondrial DNA copy numbers had a 25% lower risk of CKD compared to those with lower levels.
A new study reveals that people from different regions host different mite lineages, supporting the 'Out of Africa' theory. The study found that mites follow families through generations and are not easily transferred between humans.
Research suggests that mitochondrial function affects hormonal, metabolic, and behavioral systems in response to mild stress. This discovery has implications for understanding the genetic basis of neuropsychiatric diseases and the role of stress in human health.
A team led by University of Pennsylvania professor Theodore Schurr has discovered that many Caribbean communities retain significant indigenous ancestry. Using DNA samples from over 88 participants in Trinidad and St. Vincent, the researchers found 42% of maternal and 28% of paternal genetic heritage.
Researchers develop novel mouse model for Leber hereditary optic neuropathy and demonstrate successful gene therapy in improving visual function. The approach could aid therapy development for various mitochondrial diseases, with a clinical trial currently underway.
Mitochondrial mutations enabled humans to adapt to new environments, allowing for physiological responses and flexibility. This adaptation is crucial for species survival, as it provides faster and more flexible adaptations than nuclear DNA mutations.
Researchers discovered a metabolic signature associated with major depression, including changes in mitochondrial DNA and telomere length. The findings suggest that depression may be linked to the body's response to environmental stressors.
Researchers successfully use gene-editing technology to prevent mutated mitochondrial DNA from being passed down to offspring in mice, offering a potential cure for maternally inherited genetic disorders. The approach involves injecting mRNA into mother's oocytes or early embryos and could be easily implemented in IVF clinics worldwide.
Researchers at Salk Institute have developed a gene-editing technique to eliminate mitochondrial mutations, preventing babies from inheriting these diseases. The approach may offer new hope for carriers wishing to have children without the disease.
A recent study refutes claims of an unknown bear type in the Himalayas that inspired yeti legends. Genetic analysis suggests the samples attributed to an unknown species were actually from ordinary Himalayan Brown Bears.
A new sequencing technology called Mseek provides a deeper understanding of how genes in mitochondria influence inherited diseases such as diabetes, heart disease, and cancer. By accurately identifying heteroplasmy in mtDNA, researchers can better explain individual risks and potentially develop new therapeutic targets.
Researchers at Griffith University have discovered that mitochondria can transfer genetic material between healthy and cancerous cells, leading to rapid proliferation of tumour cells. This finding has implications for our understanding of human biology and may shed light on other diseases with defective mitochondrial DNA.
Mitochondrial donation has the potential to prevent transmission of serious mitochondrial disease, which affects brain, muscle, liver, and kidney tissues. Researchers estimate that up to 2,500 women in the UK could benefit from this technique.
Laurie Sanders, a Pitt assistant professor of neurology, will receive the William N. & Bernice E. Bumpus Foundation Innovation Award. The award supports her research on unrepaired mtDNA damage and its role in Parkinson's disease development.
A new study reveals an association between childhood adversity and psychiatric disorders at the cellular level, finding telomere shortening and altered mitochondrial DNA content in individuals with mental health conditions.
A study from Johns Hopkins Medicine found that people with less mitochondrial DNA in their blood are more likely to be frail and die earlier. The researchers hope to develop a test that can predict frailty and identify individuals who can benefit from lifestyle changes or medication.
A recent study reveals that small changes in mitochondrial function can cause abrupt shifts in disease, including diabetes, autism, and neurodegenerative disorders. The research suggests that mitochondrial energy production plays a crucial role in human health and aging.
A study by Penn State scientists found that children born to older mothers have higher rates of mitochondrial DNA mutations, which can cause over 200 diseases. The researchers also discovered the size of the 'bottleneck' period during egg-cell development, providing crucial information for genetic counseling and family planning.
Scientists have compiled a treasure trove of 146 ancient and modern human full mitochondrial genomes to improve the accuracy of molecular clocks in human evolution. The new data reveals that a molecular clock calibrated with ancient sequences is far more accurate than traditional ones based on archaeological evidence.
A new study using high-resolution Y chromosome sequencing has found that female populations have been larger throughout human history and remain so in most populations. The research suggests that processes like polygyny and women's tendency to move with their husbands contribute to females making a greater genetic contribution.
A study finds that the 'Three-Parent Baby' method, which involves combining a healthy egg cell with a defective one, may pose health risks to offspring if mitochondria from different mothers are present. Researchers propose a solution by analyzing and aligning mitochondrial DNA haplotypes before transfer.
The study provides a new framework to interpret previous research on European Neolithic populations, suggesting that the expansion took place through pioneer seafaring colonization. Genetic affinities between the mitochondrial DNA of first Neolithic farmers and those of Catalan and German farmers support this hypothesis.
A 12,000-year-old girl's DNA has revealed a significant genetic connection to modern Native Americans. The study found that Naia's skull shape was distinct from modern Native American populations, but her mitochondrial DNA showed a strong link. Researchers hope to sequence the full genome of this ancient girl in future studies.
The Hastings Center President Emeritus Thomas H. Murray calls for a national conversation about the discretion parents should have in choosing their child's traits. The FDA is considering human testing of mitochondrial manipulation, which could prevent rare diseases and address female infertility, raising concerns about safety and ethics.
A recent study reveals that bottle gourds originated from Africa and were likely domesticated multiple times in the New World. The research found that modern bottle gourd samples from the Americas matched African genetic profiles, supporting the idea that gourds floated across the Atlantic Ocean frequently.
Researchers have successfully extracted and sequenced the oldest hominin DNA to date from a 400,000-year-old fossil from Sima de los Huesos in Northern Spain. The mitochondrial genome sequence reveals that the ancient hominins are related to Denisovans and share a common ancestor with them about 700,000 years ago.
A Penn study reveals that low levels of mitochondrial DNA in tumor cells from aggressive breast cancer patients can lead to the development of metastatic properties. The research, published in Oncogene, breaks ground in understanding cancer progression and may offer a biomarker for personalized treatment approaches.
Dartmouth researcher Scott Williams found that a person can have multiple DNA mutations in different parts of their body, resulting in varying genotypes. These discoveries challenge traditional views on human uniqueness and may impact forensic analysis, paternity testing, and genetic screening.
Researchers found strong divergences in mtDNA, suggesting cryptic speciation, but no differences in nuclear DNA markers. Wolbachia infections can mimic this phenomenon, leading to false results in DNA barcoding studies. The study warns against relying solely on DNA barcoding for species identification.
A 300-year-old Asian elephant specimen has been reclassified as an African elephant due to genetic and physical evidence. The discovery confirms that the specimen, named Hansken, was likely from West Central Africa and challenges traditional understanding of the species' classification.
Researchers from Universitat Autonoma de Barcelona found that over half of the European population exhibits heteroplasmy, a condition where multiple types of mitochondrial DNA coexist. The study sheds light on mutation patterns and selection forces acting on mitochondrial DNA in mammals.
Researchers have developed a new assay called Digital Deletion Detection (3D) that accurately analyzes extremely rare mitochondrial DNA deletions associated with aging. The method uses Droplet Digital PCR technology to detect these deletions, which are often missed by conventional methods.
Researchers found that mutations of maternally inherited mitochondrial DNA in mice accelerate ageing and impair development. Damage from mother's mitochondria starts at birth and accumulates over time, leading to premature ageing and increased mortality risk.
Researchers have found that a mother's genes can influence an individual's aging process. The study suggests that mild DNA damage transferred from the mother contributes to the aging process and that reducing mutations may help extend lifespan.
Research reveals that maternal mitochondrial DNA can influence an individual's aging process, accelerating it. The findings suggest that inherited genetic mutations from mothers contribute to the aging process and potentially impact brain development.
A study identified a potential biomarker for Alzheimer's disease in cerebral spinal fluid, suggesting the condition may be detectable a decade before symptoms appear. Researchers hope to find treatments that can prevent or slow the progression of the disease.
Scientists develop a new approach to eliminate mutated DNA in mitochondria using TALEN technology inspired by plant-infecting bacteria. The method shows promise for treating mitochondrial diseases, including Leber hereditary optic neuropathy, and could lead to effective treatments for various eye diseases.
Researchers have discovered a direct genetic link between ancient Native American remains and their living descendants using mitochondrial DNA analysis. The study, published in PLOS ONE, found three maternal lineages from ancient times to the present, providing a unique connection between oral traditions and genetic evidence.