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The team plans to keep studying whether vaccines could help alleviate IBD symptoms, which tend to stay dormant then flare up. They also hope to find similar ways to nudge a dysfunctional gut microbiome back into balance.

The connection between gut bacteria and our overall health has been well studied in recent years. And while many of the specifics of this relationship are still unknown, it’s clear that a balanced microbiome with the right mix of bacteria helps maintain many of our regular bodily functions; conversely, the wrong mix of bacteria might help cause or signal the emergence of illness. But bacteria are only one type of microbe, and there’s been less work studying the many viruses and fungi that inhabit our body.

This new research was conducted by scientists from the University of Utah Health, who were curious if fungi were relevant to the development of inflammatory bowel disease (IBD), which includes Crohn’s. IBD is a complicated disorder, thought to have several contributing factors, including genetics. But recent research has suggested that certain species of fungi and yeast (the single celled version of fungi) could be one of these risk factors, including a common fungi in our gut called Candida albicans.

Continue reading “How a Common Fungus May Contribute to Digestive Issues” »

“The trend for feeding dogs raw food may be fuelling the spread of antibiotic resistant-bacteria”, the researchers said in a press release for their study, to be presented at the European Congress of Clinical Microbiology & Infectious Diseases.

Separate research to be presented at the same conference found resistance to a last-resort antibiotic may be passing between pet dogs and their owners.

Antibiotic-resistant “superbugs” — which the World Health Organization calls one of the top global threats to public health — usually conjure images of hospital settings.

Continue reading “Bad Dog? Research Suggests Superbug Link To Man’s Best Friend” »

Emotion regulation is an essential aspect of mental health and wellbeing. In fact, past studies have found associations between poor emotion regulation and several psychiatric disorders, including bipolar disorder, borderline personality disorder and complex post-traumatic stress disorder (PTSD).

During their everyday life, humans can regulate their negative emotions in different ways, most of which do not require any conscious cognitive engagement. For instance, they might take a bath, step outside for fresh air or listen to music.

Researchers at Radboud University Nijmegen in The Netherlands, the Norwegian University of Science and Technology (NTNU), and University Hospital Aachen, Germany have recently carried out a study aimed at investigating the effects of a short-term musical training on implicit emotion regulation. Their paper, published in BMC Neuroscience, specifically examined whether musical training helped people to reduce the negative emotions elicited by unpleasant or disgusting odors.

Immortality DNA strands found in humans.

Distributed stem cells (DSCs), which continuously divide asymmetrically to replenish mature tissue cells, adopt a special form of mitotic chromosome segregation. Chromosome segregation is nonrandom instead of random. DSCs cosegregate the set of sister chromosomes with the older of the two template DNA strands used for semiconservative DNA replication during the preceding S phase. Neither the responsible molecular mechanisms nor the cellular function of nonrandom segregation are known. Here, we report evidence that immortal strand chromosomes have a higher level of cytosine 5-hydroxymethylation than mortal chromosomes, which contain the younger DNA template strands. We propose that asymmetric chromosomal 5-hydroxymethylation is a key element of a cellular mechanism by which DSCs distinguish older DNA template strands from younger ones.

Immortal strands are the targeted chromosomal DNA strands of nonrandom sister chromatid segregation, a mitotic chromosome segregation pattern unique to asymmetrically self-renewing distributed stem cells (DSCs). By nonrandom segregation, immortal DNA strands become the oldest DNA strands in asymmetrically self-renewing DSCs. Nonrandom segregation of immortal DNA strands may limit DSC mutagenesis, preserve DSC fate, and contribute to DSC aging. The mechanisms responsible for specification and maintenance of immortal DNA strands are unknown. To discover clues to these mechanisms, we investigated the 5-methylcytosine and 5-hydroxymethylcytosine (5hmC) content on chromosomes in mouse hair follicle DSCs during nonrandom segregation. Although 5-methylcytosine content did not differ significantly, the relative content of 5hmC was significantly higher in chromosomes containing immortal DNA strands than in opposed mitotic chromosomes containing younger mortal DNA strands.

Given this idea could be scaled up to revive even deceased humans essentially like the tardigrade does.

Arctic ice dating to 24000 years ago held frozen microscopic animals called rotifers. Scientists just brought them back to life.

Recently, we found dramatic mitochondrial DNA divergence of Israeli Chamaeleo chamaeleon populations into two geographically distinct groups. We aimed to examine whether the same pattern of divergence could be found in nuclear genes. However, no genomic resource is available for any chameleon species. Here we present the first chameleon transcriptome, obtained using deep sequencing (SOLiD). Our analysis identified 164000 sequence contigs of which 19000 yielded unique BlastX hits. To test the efficacy of our sequencing effort, we examined whether the chameleon and other available reptilian transcriptomes harbored complete sets of genes comprising known biochemical pathways, focusing on the nDNA-encoded oxidative phosphorylation (OXPHOS) genes as a model. As a reference for the screen, we used the human 86 (including isoforms) known structural nDNA-encoded OXPHOS subunits. Analysis of 34 publicly available vertebrate transcriptomes revealed orthologs for most human OXPHOS genes. However, OXPHOS subunit COX8 (Cytochrome C oxidase subunit 8), including all its known isoforms, was consistently absent in transcriptomes of iguanian lizards, implying loss of this subunit during the radiation of this suborder. The lack of COX8 in the suborder Iguania is intriguing, since it is important for cellular respiration and ATP production. Our sequencing effort added a new resource for comparative genomic studies, and shed new light on the evolutionary dynamics of the OXPHOS system.

Keywords: chameleon, oxidative phosphorylation, transcriptome.

Massive parallel sequencing (MPS) enables identifying the entire set of transcribed genes (transcriptome) of understudied organisms, thus providing novel genomic resources. However, because there is no genomic reference to those organisms, the short reads generated by MPS must be de novo assembled in order to form sequence contigs, which in turn could be annotated (Kusumi et al. 2011), thus creating reference sequences for further analyses.

What can the decline of the Roman Empire and the end of European feudalism tell us about COVID-19 and the future of the West?

Circa 2010

In this review, we consider the evidence that a reduction in neurogenesis underlies aging-related cognitive deficits, and impairments in disorders such as Alzheimer’s disease (AD). The molecular and cellular alterations associated with impaired neurogenesis in the aging brain are discussed. Dysfunction of presenilin-1, misprocessing of amyloid precursor protein and toxic effects of hyperphosphorylated tau and β-amyloid likely contribute to impaired neurogenesis in AD. Since factors such as exercise, enrichment and dietary energy restriction enhance neurogenesis, and protect against age-related cognitive decline and AD, knowledge of the underlying neurogenic signaling pathways could lead to novel therapeutic strategies for preserving brain function. In addition, manipulation of endogenous neural stem cells and stem cell transplantation, as stand-alone or adjunct treatments, seem promising.

There is a progressive decline in the regenerative capacity of most organs with increasing age, resulting in functional decline and poor repair from injury and disease. Once thought to exist only in high turnover tissues, such as the intestinal lining or bone marrow, it now appears that most tissues harbor stem cells that contribute to tissue integrity throughout life. In many cases, stem cell numbers decrease with age, suggesting stem cell aging may be of fundamental importance to the biology of aging (for review, see Ref. [1]). Therefore, understanding the regulation of stem cell maintenance and/or activation is of considerable relevance to understanding the age-related decline in maintaining tissue integrity, function, and regenerative response.

Continue reading “When Neurogenesis Encounters Aging and Disease” »

Breast cancer is the leading cause of cancer death in women around the world, responsible for 1700 deaths every day. Although the vast majority of breast cancers are treatable, the most aggressive subtype—triple negative breast cancer (TNBC) – has a high recurrence rate, a high potential for metastasis and shows resistance to conventional treatments, leading to very poor prognosis and survival outcomes. A team of researchers at the Research Institute of the McGill University Health Center (RI-MUHC) conducted a preclinical study and discovered a novel targeted combination therapy that efficiently reduced tumor growth in metastatic breast cancer. Published in Nature Communications, their findings could lead to the development of a novel first line targeted therapy for the treatment of TNBC, with the prospect of rapidly transitioning to clinical trials in humans.

“There is no targeted therapy for TNBC. Chemotherapy treatment can even enrich these tumors in cancer stem cells and be detrimental to the patient, as we have shown in a previous study,” says Dr. Jean-Jacques Lebrun, senior scientist in the Cancer Research Program at the RI-MUHC and principal investigator of the study. “Filling that huge medical gap was our motivation in conducting this study.”

While most breast cancers have one of three main receptors that are like entrance gates for treatments—estrogen, progesterone and a protein called human epidermal growth factor (HER2) – TNBC has none, thus the name triple negative breast cancer. Using state-of-the-art technologies such as gene editing and genome-wide molecular approaches, the team identified two pathways which could be targeted in a therapeutic strategy.