UNC’s novel way to visualize the human proteome could lead to improved clinical laboratory tests along with the development of new therapies
Diagnostic testing based on proteomics is considered to be a field with immense potential in diagnostics and therapeutics. News of a research breakthrough into how scientists can visualize protein activity within cells will be of major interest to the pathologists, PhDs, and medical laboratory scientists who specialize in clinical laboratory testing involving proteins.
Proteins are essential to all life and to the growth, maintenance, and repair of the human body. So, a thorough understanding of how they function within living cells would be essential to informed medical decision-making as well. And yet, how proteins go about doing their work is not well understood.
That may soon change. Scientists at the University of North Carolina (UNC) School of Medicine have developed an imaging method that could provide new insights into how proteins alter their shapes within living cells. And those insights may lead to the development of new therapies and medical treatments.
Dubbed “binder-tag” by the UNC scientists, their new technique “allows researchers to pinpoint and track proteins that are in a desired shape or ‘conformation,’ and to do so in real time inside living cells,” according to a UNC Health news release.
Two labs in the UNC School of Medicine’s Department of Pharmacology collaborated to develop the binder-tag technique:
“No one has been able to develop a method that can do, in such a generalizable way, what this method does. So, I think it could have a very big impact,” said lead author of the UNC study Klaus Hahn PhD (above), in the news release. “With this method we can see, for example, how microenvironmental differences across a cell affect, often profoundly, what a protein is doing,” he added. This research may enlarge scientists’ understanding of how the human proteome works and could lead to new medical laboratory tests and therapeutic drugs. (Photo copyright: UNC School of Medicine.)
How Binder-Tag Works
During their study, the UNC scientists developed binder-tag “movies” that allow viewers to see how the binder-tag technique enables the tracking of active molecules in living cells.
The technique involves two parts: a fluorescent binder and a molecular tag that is attached to the proteins of interest.
When inactive, the tag is hidden inside the protein, but when the protein is ready for action it changes shape and exposes the tag.
The binder then joins with the exposed tag and fluoresces. This new fluorescence can easily be tracked within the cell.
Nothing else in the cell can bind to the binder or tag, so they only light up when in contact on the active protein.
This type of visualization will help researchers understand the dynamics of a protein in a cell.
“The method is compatible with a wide range of beacons, including much more efficient ones than the interacting beacon pairs required for ordinary FRET [fluorescence resonance energy transfer]. Binder-tag can even be used to build FRET sensors more easily. Moreover, the binder-tag molecules were chosen so that nothing in cells can react with them and interfere with their imaging role,” Hahn said in the news release.
“Only upon exposure can the peptide specifically interact with a reporter protein (the binder). Thus, simple fluorescence localization reflects protein conformation. Through direct excitation of bright dyes, the trajectory and conformation of individual proteins can be followed,” the UNC researchers wrote in Cell. “The simplicity of binder-tag can provide access to diverse proteins.”
The UNC researchers’ binder-tag technique is a way to overcome the dire challenge of seeing tiny and hard-working proteins, Cosmos noted. Typical light microscopy does not enable a view of molecules at work. This paves the way for the new binder-tag technique, UNC pointed out.
“With this method, we can see, for example, how microenvironmental differences across a cell affect—and often profoundly—what a protein is doing,” Hahn said. “For a lot of protein-related diseases, scientists haven’t been able to understand why proteins start to do the wrong thing. The tools for obtaining that understanding just haven’t been available.”
More Proteins to Study
More research is needed before the binder-tag method can be used in diagnostics. Meanwhile, the UNC scientists intend to show how binder-tag can be applied to other protein structures and functions.
“The human proteome has between 80,000 and 400,000 proteins, but not all at one time. They are expressed by 20,000 to 25,000 human genes. So, the human proteome has great promise for use in diagnostics, understanding disease, and developing therapies,” said Robert Michel, Editor-in-Chief of Dark Daily and its sister publication The Dark Report.
Medical scientists and diagnostics professionals will want to stay tuned to discover more about the tiny—though mighty—protein’s contributions to understanding diseases and patient treatment.
Proteins in human saliva make up its proteome and may be the key to new, precision medicine diagnostics that would give clinical pathologists new capabilities to identify disease
Clinical pathologists may soon have an array of new precision medicine diagnostic tools based on peoples’ saliva. There are an increasing number of “–omes” that can be the source of useful diagnostic biomarkers for developing clinical laboratory tests. The latest is the world’s first saliva protein biome wiki.
Called the Human Salivary Proteome Wiki (HSP Wiki), the “public data platform,” which was created by researchers at the University of Buffalo, is the “first of its kind,” according to Labroots, and “contains data on the many thousands of proteins present in saliva.”
The HSP Wiki brings together data from independent studies on proteins present in human saliva. One of the researchers’ goals is to speed up the development of saliva-based diagnostics and personalized medicine tools.
In “The Human Salivary Proteome Wiki: A Community-Driven Research Platform,” published in the Journal of Dental Research, the researchers wrote, “Saliva has become an attractive body fluid for on-site, remote, and real-time monitoring of oral and systemic health. At the same time, the scientific community needs a saliva-centered information platform that keeps pace with the rapid accumulation of new data and knowledge by annotating, refining, and updating the salivary proteome catalog.
“We developed the Human Salivary Proteome (HSP) Wiki as a public data platform for researching and retrieving custom-curated data and knowledge on the saliva proteome. … The HSP Wiki will pave the way for harnessing the full potential of the salivary proteome for diagnosis, risk prediction, therapy of oral and systemic diseases, and preparedness for emerging infectious diseases,” they concluded.
“This community-based data and knowledge base will pave the way to harness the full potential of the salivary proteome for diagnosis, risk prediction, and therapy for oral and systemic diseases, and increase preparedness for future emerging diseases and pandemics,” Stefan Ruhl, DDS, PhD (above right, with Omer Gokcumen, PhD, Associate Professor of Biological Sciences on left), Professor, Department of Oral Biology, University of Buffalo, and lead researcher of the study, told Labroots. Development of precision medicine clinical laboratory diagnostics is part of their research goals. (Photo copyright: University of Buffalo.)
Where Does Saliva Come From?
Saliva is a complex biological fluid that has long been linked to oral health and the health of the upper gastrointestinal tract. Only recently, though, have scientists begun to understand from where in the body saliva proteins originate.
The authors wrote: “Salivary proteins are essential for maintaining health in the oral cavity and proximal digestive tract, and they serve as potential diagnostic markers for monitoring human health and disease. However, their precise organ origins remain unclear.
“Through transcriptomic analysis of major adult and fetal salivary glands and integration with the saliva proteome, the blood plasma proteome, and transcriptomes of 28+ organs, we link human saliva proteins to their source, identify salivary-gland-specific genes, and uncover fetal- and adult-specific gene repertoires,” they added.
“Our results pave the way for future investigations into glandular biology and pathology, as well as saliva’s use as a diagnostic fluid,” the researchers concluded.
Saliva plays a crucial role in digestion by breaking down starches. It also provides a protective barrier in the mouth. When salivary glands malfunction, patients can face serious health consequences. Although clinicians and scientists have long understood the importance of saliva to good health, the question now is whether it contains markers of specific diseases.
“The Human Salivary Proteome Wiki contains proteomic, genomic, transcriptomic data, as well as data on the glycome, sugar molecules present on salivary glycoproteins. New data goes through an interdisciplinary team of curators, which ensures that all input data is accurate and scientifically sound,” noted Labroots.
The graphic above “shows the interconnectedness of the thousands of salivary proteins originating from blood plasma, parotid glands, and submandibular and sublingual glands. The diagram is one of many tools available to researchers and clinicians through the Human Salivary Proteome Wiki,” noted a UBNow blog post. (Graphic copyright: University of Buffalo.)
Omics and Their Role in Clinical Laboratory Diagnostics
Proteomics is just one of several hotly-researched -omics that hold the potential to develop into important personalized medicine and diagnostics tools for pathologists. Genomics is a related area of research being studied for its potential to benefit precision medicine diagnostics.
However, unlike genomes, which do not change, proteomes change constantly. That is one of the main reasons studying the human salivary proteome could lead to valuable diagnostics tools.
Combining the study of the -omes with tools like mass spectrometry, a new era of pathology may be evolving. “With the rapid decrease in the costs of omics technologies over the past few years, whole-proteome profiling from tissue slides has become more accessible to diagnostic labs as a means of characterization of global protein expression patterns to evaluate the pathophysiology of diseases,” noted Pathology News.
Saliva and the Age of Precision Medicine
The study of the -omes may be an important element in the evolution of precision medicine, because of its ability to provide information about what is happening in patients’ bodies at the point of care.
Thus, a full understanding of the proteome of saliva and what causes it to change in response to different health conditions and diseases could open the door to an entirely new branch of diagnostics and laboratory medicine. It is easy and non-invasive to gather and, given that saliva contains so much information, it offers an avenue of study that may improve patients’ lives.
It also would bring us closer to the age of precision medicine where clinical laboratory scientists and pathologists can contribute even more value to referring physicians and their patients.
At least that’s what researchers at ETH Zurich (ETH), an international university for technology and natural sciences, have concluded. They published the results of their study in Cell.
“Here, we present a chemoproteomic workflow for the systematic identification of metabolite-protein interactions directly in their native environments,” the researchers wrote. “Our data reveal functional and structural principles of chemical communication, shed light on the prevalence and mechanisms of enzyme promiscuity, and enable extraction of quantitative parameters of metabolite binding on a proteome-wide scale.”
Interactomics address interactions between proteins and small molecules, according to an article published in Technology Networks. The terms “interactomics” and “omics” were inspired by research that described, for the first time, the interactions and relationships of all proteins and metabolites (A.K.A, small molecules) in the whole proteome.
Medical laboratories and anatomic pathologists have long understood the interactions among proteins, or between proteins and DNA or RNA. However, metabolite interactions with packages of proteins are not as well known.
These new omics could eventually be an important source of diagnostic biomarkers. They may, one day, contribute to lower cost clinical laboratory testing for some diseases, as well.
Metabolite-Protein Interactions are Key to Cellular Processes
The ETH researchers were motivated to explore the interplay between small molecules and proteins because they have important responsibilities in the body. These cellular processes include:
“Metabolite-protein interactions control a variety of cellular processes, thereby playing a major role in maintaining cellular homeostasis. Metabolites comprise the largest fraction of molecules in cells. But our knowledge of the metabolite-protein interaction lags behind our understanding of protein-protein or protein-DNA interactomes,” the researchers wrote in Cell.
Leveraging Limited Proteolysis and Mass Spectrometry
The researchers used limited proteolysis (LiP) technology with mass spectrometry to discover metabolite-protein interactions. Results aside, experts pointed out that the LiP technology itself is significant.
“It is one of the few methods that enables the unbiased and proteome-wide profiling of protein conformational changes resulting from interaction of proteins with compounds,” stated a Biognosys blog post.
Biognosys, a proteomics company founded in 2008, was originally part of a lab at ETH Zurich.
The ETH team focused on the E. coli bacterial cell in particular and how its proteins and enzymes interact with metabolites.
“Although the metabolism of E. coli and associated molecules is already very well known, we succeeded in discovering many new interactions and the corresponding binding sites,” Paola Picotti, PhD, Professor of Molecular Systems Biology at ETH Zurich, who led the research, told Technology Networks. “The data that we produce with this technique will help to identify new regulatory mechanisms, unknown enzymes and new metabolic reactions in the cell,” she concluded. (Photo copyright: ETH Zurich.)
More than 1,000 New Interactions Discovered
The study progressed as follows, according to Technology Networks’ report:
“Cellular fluid, containing proteins, was extracted from bacterial cells;
“Strikingly, more than 80% of the reported interactions were novel and about one quarter of the measured proteome interacted with at least one of the 20 tested metabolites. This indicates that the metabolite-protein interaction network is vast and largely uncharted,” Papp stated in an ETH Zurich Faculty of 1000 online article.
According to Technology Networks, “Picotti has already patented the method. The ETH spin-off Biognosys is the exclusive license holder and is now using the method to test various drugs on behalf of pharmaceutical companies.”
The pharmaceutical industry is reportedly interested in the approach as a way to ascertain drug interactions with cellular proteins and their effectiveness in patient care.
The ETH Zurich study is compelling, especially as personalized medicine takes hold and more medical laboratories and anatomic pathology groups add molecular diagnostics to their capabilities.
Every medical laboratory ready to begin the move away from fee-for-service payment and towards value-based reimbursement needs to start offering lab tests that support the practice of precision medicine
Nearly every clinical laboratory and pathology group in America today is aware of the opportunity to provide medical laboratory tests that enable physicians to successfully practice precision medicine. The goal of precision medicine is to enable a patient to get a more accurate diagnosis, receive the most appropriate therapy, and have his/her condition monitored with unprecedented insight during the course of treatment.
The good news for the clinical laboratory industry concerning precision medicine is that it is the fastest-growing sector of lab testing and these are the tests that contribute the greatest value in patient care. For example, molecular and genetic tests are revolutionizing the diagnosis and treatment of infectious disease. These are the clinical lab tests that enable a physician to identify the specific subtype of the bacteria or virus, then help him or her select the therapeutic drug that will have maximum benefit for the patient.
Clinical Laboratories Support Cancer Diagnosis with Companion Diagnostic Tests
It is equally true that the diagnosis and treatment of cancer is undergoing a major transformation. Genetic knowledge is being used to develop both diagnostic tests and new therapies that enable physicians to better diagnose cancer, and then treat it with the drugs identified by a companion diagnostic test as having the best potential to cure the patient or slow the progression of the disease.
But if there is an area of precision medicine with immense potential, it is pharmacogenomics and its associated testing.
In 2015, the Kaiser Family Foundation reported that more than four billion prescriptions were filled in the United States. As science understands more about the human genome, proteome, metabolome, and microbiome (to name just a few of the “omes”), it becomes possible to design clinical laboratory tests that:
1. Contribute to a more accurate diagnosis;
2. Identify which prescription drugs will be of the greatest benefit; and
3. Inform the physician as to which drugs will not be effective and may even be harmful to the patient.
More Good News for Medical Laboratories
There is even more good news. Many clinical laboratories, hospital labs, and pathology groups already have lab instruments capable of performing the tests used in precision medicine. For these labs, no major up-front investment is needed to begin offering tests that allow physicians to practice precision medicine.
“Many of our lab clients got started in this way,” stated Don Rule, MBA, Founder and Chief Executive Officer of Translational Software in Bellevue, Wash. “They realized that their existing lab instruments could run some of the lab tests physicians use when practicing precision medicine. This would be a low-cost way to enter the precision medicine field and they could, on a small scale with minimal risk, begin offering these tests to gain experience, learn more about the market, and identify which such tests would have highest value to the physicians in the communities they serve.”
Is Your Pathology Group Interested in Supporting Precision Medicine?
“For a lab that is serious about understanding the current and future clinical demand for precision medicine tests, several careful steps are recommended,” he continued. “One step is to build demand by educating clinicians and their staffs about the best ways to use these tests to improve patient care. Keep in mind that more of a physician’s reimbursement is now keyed to the patient outcomes they deliver. These doctors recognize that labs helping them do a better job with precision medicine are also helping them demonstrate greater value in the patient care they provide.
“There are other steps required to launch an effective, clinically successful precision medicine testing program,” Rule noted. “For example, labs need to understand how to be paid by the health insurers in their region. That includes getting in-network and teaching physicians and lab staff how to follow each payer’s clinical and coding criteria so that clean claims will be paid in a timely manner.
“Another step is to build the market in a careful fashion,” he emphasized. “For example, labs should identify the thought leaders among their clients and work with them to demonstrate the clinical utility of tests performed in support of precision medicine. And above all, it’s important to focus on patients that are most likely to get some insight from testing. When your lab starts with the right population, it’s remarkable how often you will uncover actionable issues.”
Clinical Labs Can Enter Precision Medicine by Initially Referring Tests
“It’s also feasible for a lab to start its precision medicine strategy by referring out testing in the early stages and using third-party experts to do the interpretations,” Rule advised. “Then, as specimen volume increases, and the lab’s clinical team gains more experience with these molecular and genetic tests, it becomes easy to bring that testing in-house to develop the market further with faster turnaround times and in-house expertise that local physicians appreciate.”
Two expert speakers will cover the essentials that all labs should know about building a market presence in precision medicine. First to present is Don Rule of Translational Software. Rule currently provides a variety of services to more than 80 lab clients, which includes the annotation and interpretation of gene sequences. In addition, Rule and his team provide consulting expertise to help labs develop their strategies for precision medicine, identify the best tests to offer physicians, and develop the steps needed to obtain network status with payers.
Webinar Will Present the Best Successes of Molecular, Genetic Testing Labs
Rule will share the experiences and best successes of the molecular and genetic testing labs he has worked with since 2009. He will discuss the types of lab tests used in precision medicine in different specialties, identify the fastest-growing sectors, and note which instruments already found in most clinical laboratories can be used to provide lab tests used for precision medicine.
Don Rule (above left), Founder and CEO of Translational Software, and Kyle Fetter (above right), Vice President of Advanced Diagnostics at XIFIN, will share their unique insights, knowledge, and experience at developing a precision medicine lab testing program for clinical laboratories that want to build more market share, make the billing/collections team more effective, and increase revenue. (Photo copyright: Dark Daily.)
As one example, a growing number of long-term care facilities are using tests to practice precision medicine—and paying for these tests under value-based arrangements—because so many of their patients are taking from 10 to 15 prescriptions each day. If a lab test indicates that the patient may not be getting therapeutic benefit from a specific drug (or that there are negative side effects from the polypharmacy), then the long-term care facility is money ahead because of less spending on drugs and the decreased care costs from patients who remain healthier. In the extreme case, the care facility might lose a patient to a skilled nursing facility due to mental fog or a fall that is precipitated by adverse drug effects.
Making the Case for a Precision Medicine Lab Testing Program
Additional topics to be discussed are:
• How to make the case to administration and the clinicians;
• How to build demand; and
• How to identify thought leaders and work with them to educate the physicians in the lab’s service region.
The second speaker will address the important topic of how to get paid. Kyle Fetter, MBA, is Vice President of Advanced Diagnostics at XIFIN, Inc., based in San Diego. XIFIN provides revenue cycle management (RCM) services to more than 200 labs and handles as many as 300 million lab test claims annually. What this means is that Fetter sees which labs are most successful with their coding, billing, and collections for molecular and genetic tests. He also sees how different payers are handling these claims.
During his presentation, Fetter will provide you and your lab team with valuable knowledge about the best ways to collect the information needed to submit clean claims and be paid promptly. He will illustrate ways to optimize the process of gathering this data and the different software tools that not only make the job easier, but help ensure that a higher proportion of claims are clean and paid at first submission.
Secrets of Preparing for Payer Challenges, Denials, and Audits
But the single best element of Fetter’s presentation will be how labs performing molecular and genetic testing should prepare, as part of the normal course of business, for the inevitable challenges, denials, and audits. He will describe the elements of a system that helps labs be ready to make the case that claims are properly documented, and that they represent appropriate and necessary tests for the patient.
You can find details for this important webinar at this link. (Or copy this URL and paste it into your browser: https://www.darkdaily.com/webinar/what-molecular-and-genetic-testing-labs-need-to-know-to-succeed-with-commercialization-of-their-precision-medicine-products.)
This webinar is perfect for any lab that is already performing molecular and genetic tests, and which is interested in building more market share, making the billing/collections team more effective, and increasing revenue.
For every lab watching the precision medicine space, this webinar is a “must attend” because it delivers to you and your lab team the collective knowledge and insights from two experts who are working with hundreds of the nation’s most successful labs. It is your guaranteed way to get the accurate, relevant information you need to craft your own lab’s strategy for expanding its molecular and genetic testing opportunities.
Researchers believe they have begun to crack open a ‘black box’ involving the genomes and diseases of individual patients
Researchers in Switzerland are developing a new way to use mass spectrometry to explain why patients respond differently to specific therapies. The method potentially could become a useful tool for clinical laboratories that want to support the practice of precision medicine.
It is also one more example of how mass spectrometry is being used by researchers to develop new types of diagnostic assays that perform as well as traditional clinical laboratory testing methods, such as chemistry and immunoassay.
Thus, the latest research from the Swiss Federal Institute of Technology in Lausanne (EPFL) and ETH Zurich (ETHZ), will be of interest to pathology laboratory managers and medical laboratory scientists. It combines SWATH-MS (Sequential Window Acquisition of all Theoretical Mass Spectra) with genomics, transcriptomics, and other “omics,” to explain why patients respond differently to specific therapies, and to formulate a personalized strategy for individual treatment. (more…)
