Tiny particles of gold with a size of few nanometers holds the key to transform how scientist can detect Parkinson’s disease. Scientists at the Institute of Nano Science and Technology (INST), Mohali, an autonomous institute under the Department of Science and Technology (DST) has demonstrated how these particles can be used to build a nanotechnology-based tool for diagnosing Parkinson’s disease much earlier than today’s methods allow.
Parkinson’s disease is the world’s fastest-growing neurological disorder. According to the Global Burden of Disease Study 2019, more than 8.5 million people worldwide live with Parkinson’s and this number has doubled since 1990. Every year approximately 120,000 people die globally due to complications linked with Parkinson’s.
In India an estimate suggests that around 5–7 lakh patients are currently living with Parkinson’s and the numbers are climbing at a fast pace as life expectancy increasing. Research published in the Journal of Parkinson’s Disease indicates that the prevalence rate in India ranges from 15 to 45 cases per 100,000 people, while in semiurban its about 7 per one lakh population. Experts warns that the numbers could nearly double by 2030. With rapidly aging population of India, the disease is threatening health care system to become a major public health challenge.
The problem gets worsened by late diagnosis. In most of the cases, Parkinson’s is detected once after 60–70% of brain cells responsible for dopamine production are already damaged. Symptoms such as tremors, stiffness and slowed movement have already creeped inside thus leaving limited treatment options. Detecting the disease earlier could mean early access to medical intervention, better quality of life and lesser healthcare costs.
Spark of an Idea in INST, Mohali
At the Institute of Nano Science and Technology (INST), a group scientists tinked about how proteins behave in the brain during disease sparked an innovative approach. This group started exploring that the surface charge of a protein reveals how dangerous it is?
They focused on α-synuclein a protein strongly linked to Parkinson Disease. In its normal form, α-synuclein is harmless. In certain period it can change its shape and clump together into toxic aggregates that damages brain cells. The team also started working on sensors that how protein forms apart and are charged.
Turning Gold Nanoparticles into a Biosensor
The team led by Dr. Sharmistha Sinha, Senior Scientist at INST, supported with her PhD students Ms. Harpreet Kaur and Ms. Ishani Sharma. They collaborated with Dr. Deepak Sharma and Arpit Tyagi from the CSIR-Institute of Microbial Technology (IMTECH), Chandigarh, having expertise in protein biochemistry and cell-based assays.
The collaboration between scientists and their research scholar came up with the solution in the form of gold nanoclusters (AuNCs) an ultrasmall, glowing particles just a few nanometers wide. By coating these clusters with naturally occurring amino acids, the team made them selectively sticky. Proline-coated nanoclusters were drawn to the normal version of α-synuclein. Histidine-coated nanoclusters latched onto the toxic aggregates. This property allowed the biosensor to distinguishes between harmless and harmful (amyloid) protein forms.
The journey from idea to proof-of-principle included a broad spectrum of experiments:
Engineered and purified two forms of α-synuclein (normal and mutant).
Synthesized amino acid capped gold nanoclusters and then characterized the nanoclusters using UV-Vis spectroscopy, fluorescence imaging, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) to study their structure and optical properties.
Studied nanocluster-protein interactions using gel electrophoresis, fluorescence quenching and electrochemical methods like cyclic voltammetry and impedance spectroscopy.
Finally tested the system in human-derived SH-SY5Y neuroblastoma cells to ensure it worked safely and effectively in biological conditions.
The results confirmed that the biosensor could reliably identify toxic protein aggregates linked with Parkinson’s disease.
Why This Matters for India
Currently India is facing a critical phase of neurological health crisis including depression, Obsessive Compulsion Disorder, Alzheimer and Parkinsons. With over 138 million elderly citizens expected by 2031 will suffer age-related diseases like Parkinson’s will rise steeply. Most Indian patients are diagnosed late often when symptoms severely affect daily life due less information.
A low-cost, label-free and clinically adaptable diagnostic tool gold nanocluster biosensor, could make early detection possible even in resource-limited settings. Unlike expensive imaging scans and invasive procedures. Such sensors could be deployed in point-of-care testing unit to reach rural and semi-urban populations where majority of Indian lives.
Early detection also means:
- Timely treatment
- Better management of lifestyle changes, physiotherapy and diet.
- Reduced long-term burden on families and healthcare systems.
In a country where neurological care facilities are unevenly distributed, such innovations could become a lifeline. The team’s work also has broader implications. Many neurodegenerative diseases, such as Alzheimer’s are linked to misfolded proteins. A similar nanotechnology innovation could approach to detect other diseases too. By focusing on making the system simple, scalable and cost-effective, the researchers are opening doors to a new generation of diagnostic tools.
This journey from a lab discussion in Mohali to a proof-of-concept biosensor highlights the power of collaboration between young researchers and experienced scientists. It also reflects India’s growing capability in nanoscience and biotechnology.
For Parkinson’s patients and their families, the promise of profound test that can catch the disease before symptoms appear. For India, it means preparing ahead of a looming public health challenge. And for science it signals that the tiniest particles like gold nanoclusters just nanometer wide can hold answers to some of humanity’s biggest health problems.
