The research was financed by the Wellcome Trust and the Danish Cancer Society. It was released in the Nature Genetics and was provided by investigators from the University of Oxford and Copenhagen University Hospital.

Genetic mutations can affect various body cells in different moments of one`s life span. Some of the transformations affect the cells that develop sperm of female eggs and may trigger mutations that burden the child. Other mutations may take place in different body cells and develop in tumors, but these types are not genetic.

This recent research studies the association between specific, rare children inherited conditions and rare tumors that affect the testicles in the case of older patients. The sperm of eggs that are the product of changed germ cells appear to be the causes of these rare testicular tumors.

Even though the first transformations seldom appear in the germ cells, they trigger the mutant tissues to increase. In the cellular division process, a cell that has a transformation in its DNA transfers this bias to all its replicas and taking into consideration the germ cells which produce sperm, these mutations are transferred to all the spermatozoids. Thus, this propensity in the sperm mutation increases in the case of older males, at the same time increasing their chances to conceive children with health conditions.

Leading the research was professor Andrew Wilkie from the University of Oxford. He stated that his team thought that older men developed mutated bundle of cells as they grew older. These bundles commonly produce no harm and may appear as moles located on the skin`s surface. However, if the mutated bundle of cells is found in the testicles it may trigger the conception of offspring who present various poor health conditions. The team of scientists entitled these bundles “selfish” due to the fact that they do not affect their host, in this case the older fathers, but bring upon a serious burden to the children conceived by these fathers.

This study aids doctors in discovering the triggering causes of some bad health conditions that interact with the offspring`s good evolution. Some of the serious health conditions that may appear due to the cellular mutations sum up Apert, Costello and Noonan syndromes, achondroplasia and even the death of the fetus inside the female`s uterus or at the moment of birth. In additions, the research also associated these diseases to a framework which controls the division of the cells. The study is more valuable as it can give the medical staff the chance to present to the parents the causes which triggered the poor health condition of their children and also make them aware of the diseases incidence risk. However, in the majority of the cases, there is a slight chance that future child conceptions would be affected by the genetic mutations.

The outcomes of the research may also shed some light in one of the greatest questions related to genetics. What is the mechanism for the genetic material to be a major element in the appearance and development of similar illnesses? Similar illnesses are triggered by a number of genes that interact with each other. However, even if doctors analyzed the relationship between the genome and these genes, a small number of them was revealed. Some of the health conditions, comprising breast malign tumors, autism and schizophrenia, appear to have an increased development risk in children who were conceived by older fathers. However, the reasons for these are not still known. Professor Andrew Wilkie states that some of these conditions may be triggered by similar but less aggressive gene transformations.

As the leading investigator explains, the research may have studied only 10% or less of the less aggressive gene transformations which are presented in the human genome. However, as he continues, the gene mutations are either too rare or too weak to be detected by nowadays technology. Nonetheless, their accurate number has a summing up effect and triggers health conditions.

The team of investigators state that additional investigations need to be done in order to discover other genes which may be affected by the mutation process. Nonetheless, the technology for sequencing the DNA has moved at a higher level and is able now to gather a wider sequence in just a day compared to what was in the past when the same amount of sequence was obtained over the time span of almost an entire year. This obsolete technology was available only ten years ago. The scientists hope that these progresses done in the DNA sequencing process would evolve with the passing of the years and enable researchers to find out the actual risk of children being affected by the genetic mutations of the germ cell from their fathers` bodies.

The conclusions of the study can be found in Nature Chemical Biology issue. The study comprises observations regarding T cells of the immune system which act as regulators between the immune cells that show a particular aggressive behavior and their environment through a chemical reaction. Professor Ruma Banerjee is the study`s senior author and activates in the Vincent Massey Collegiate Professor of Biological Chemistry and associate chair of biological chemistry at the U-M Medical School. He explains: “Now we know that the redox environment outside the cell is a very important dynamic. It regulates cell function.” These redox chemical processes represent the milestones in the manner cells produce and consume energy.

The T-cells have a regulatory role in the aggressive behavior of the aggressive immune cells also known as auto-reactive T cells. The normal T-cells act in two way, they either stop the aggressive cousin cells or make them to increase in number. The proliferation of aggressive immune cells triggers the inflammation of the intestine entitled IBD (inflammatory bowel disease) and also causes ulcerative colitis.

Researchers on Professor Banerjee`s team want to deepen the studies about the regulatory T cells and plan to experiment on animals. Due to the fact that this type of cells influences the response of the body to diseases, pregnancy and organ transplant, scholars wish to find out more about the way the aggressive T cells can be counteracted by their normal variant.

Background

The immune system contains cells that confuse the own body`s components and treat them as threats and start attacking them. Auto-reactive T cells trigger multiple sclerosis, Crohn`s disease, lupus, and so on and so forth. These represent immune diseases caused by the fact that the cells in the human body attack each other. This is why scholars desire to discover the way in which normal T cells can stall or stop the activity of aggressive auto-reactive T cells. Furthermore, researchers want to find a way to make auto-reactive T cells recognize and try to destroy the cancer cells.

It has been discovered that the redox chemistry has an important part in the mechanism of regulation of immune cells. Even if this is still an emerging field in medicine, it is not least important due to the fact that redox can help cure many diseases. The researchers believe that their observations and discoveries will bring in the future the knowledge to regulate the T regulatory in order to cure diseases and stop the body`s cells from aggressive behavior against one another. The first author of this study, graduate student Zhonghua Yan states: “Redox chemistry is a mechanism that is fundamentally important in understanding T regulatory cell actions.” says

Conducting research and future plans

The team of researchers studied the immune system of mice by looking at culture dishes with immune cells. They discovered that between dendritic cells and auto-reactive T cells there is redox communication. The first represent the immune cells that are the prime ones in detecting foreign bodies in the human body and they change the chemical environment in order to stimulate the activation of the T cells. However, these immune regulatory cells get involved in the redox communication and minimize the effect.

Researchers recognize the fact that many more studies are needed in order to better understand the way these processes work. Moreover they wish to do experiments on animals suffering from inflammatory bowel disease or any other immune disease. Professor Ruma Banerjee states: “We are keen to move this into a disease model.” The researchers` desire is an accomplishable one due to the fact that past studies made it easy to understand the way in which regulatory T cells interfere in the redox chemistry.

Biologist Michael Cosgrove was the leader of the research team. During their experiments on the Mixed Lineage Leukemia (MLL) protein complex, they discovered that the MLL was not the single molecular mechanism in the protein. In fact, there were two molecular switches present in the complex, one of which no one ever knew before. They named it W-Rad.

Healthy cells contain MLL which comprises four proteins that include the second molecular switch discovered by the research team. Their role is to control the DNA pack activities needed to create white blood cells. If this switch is broken, the white blood cells develop in a bad manner which causes abnormal cells to form. Same as the Mixed Lineage Leukemia, if the proteins forming the W-RAD complex grew in large numbers they would determine the appearance of various types of cancer cells. However, researchers do not properly know which the functions of these proteins are.

The research team studied this processes and discovered that the newly found W-RAD proteins created a brand new molecular switch which was never known before their study. A switching process of the W-RAD complex leads to an overproduction of abnormal cells. This is why Cosgrove`s team hopes that they would be able to find a method to stop the W-RAD`s mechanism in order to stall of prevent the multiplication of the cancer cells and maybe transforming them into healthy ones.

Cosgrove`s scientific team discovered many interesting and important things in the field of leukemia. They managed to approach a damaged Mixed Lineage Leukemia switch with an artificial peptide. This synthetic peptide is thought to have the ability to program the way DNA is wrapped in leukemia infected cells in order to transform the ill cells into normal ones.

This new research is also published in the Journal of Biological Chemistry. Due to these two major studies, the scientific team received from the American Cancer Society a research grant in total value of $720,000 in order to continue their exploration in the field of leukemia.