Paola Domizio Undergraduate Essay Prize winners

When the result arrived, it was a single line in an electronic report: Pathogenic COL4A1 variant detected. 

For the laboratory, it was one genetic sequence among thousands processed that week. For the family sitting in front of us, it was an answer many years in the making. 

Test results return as numbers, letters, or reports, often glanced at briefly before clinical decisions are made. Yet behind some of these tests lies the power to reframe an entire life. 

I met her in a neurology outpatient clinic. She was 35 years old and arrived in a wheelchair, her parents guiding her carefully through the doorway. Her speech was fragmented and effortful, her movements spastic. She had cognitive impairment and required assistance with most activities of daily living. 

Her story, however, began in her early twenties. 

Previously fit and well, she had suffered a catastrophic stroke without any warning. There were no conventional vascular risk factors. It was later suspected that she had experienced a smaller, unrecognised cerebrovascular event beforehand. The stroke left her with permanent motor impairment. Over the years, further difficulties emerged, progressive spasticity, white matter abnormalities on neuroimaging, and early-onset arthritis affecting her knees. For more than a decade, her condition had been understood as tragic, but essentially sporadic. A devastating vascular event in a young woman. Unusual, but also unexplained. 

The consultation I observed had been prompted by recent imaging. An MRI scan demonstrated diffuse abnormalities within the cerebral white matter, disproportionate to what might be expected from a single prior stroke. The pattern suggested an underlying small vessel process rather than isolated infarction. This observation, subtle yet significant, prompted further investigation. 

A genetic test was requested. 

The result identified a pathogenic mutation in the COL4A1 gene. COL4A1 encodes the alpha 1 chain of type IV collagen, a crucial structural component of basement membranes, particularly within cerebral small vessels.¹ Type IV collagen forms the structural scaffold of basement membranes; when its architecture is altered, the vessel wall loses tensile strength, rendering small cerebral vessels vulnerable to rupture and occlusion. 

Mutations in this gene weaken vascular integrity, predisposing individuals to haemorrhage, ischaemic stroke, and progressive small vessel disease.²  Extracerebral manifestations, including ocular, renal and musculoskeletal abnormalities, are also recognised.¹ In one lab report, years of clinical uncertainty merged into a single unifying diagnosis. Her stroke was not random. The white matter changes were not incidental. The arthritis was not unrelated. They were expressions of a systemic defect in vascular architecture. 

What struck me most was not the molecular biology, but the moment of realisation in the room. Her parents, who had carried the memory of their daughter’s sudden collapse for over a decade, asked quietly: “So the stroke, the brain changes, even her knees - is it all linked to this one faulty gene?” There was something profound in that question. It captured both astonishment and grief. The idea that microscopic alterations in collagen, invisible, silent, had shaped the course of their daughter’s adulthood. The impact of this pathology test extended far beyond diagnostic labelling. 

First, it provided coherence. For years, her condition had been an amalgamation of events. Now it was a syndrome. Diagnostic closure carries psychological weight; uncertainty can be as burdensome as disease itself. Second, it altered management. Recognition of COL4A1-related small vessel disease informs vascular risk management and prompts consideration of associated systemic features. Knowledge reshapes clinical vigilance. Third, it carried implications for her family. COL4A1 mutations are typically inherited in an autosomal dominant pattern, though de novo mutations occur.¹

She had 2 older sisters, both with children. A single genetic result now rippled outward into conversations about testing, inheritance, and future risk. The laboratory had not only examined her DNA; it had potentially altered the medical narratives of her entire family. 

Finally, it reframed the meaning of her past. What had once seemed like cruel chance was now understood as biological inevitability. Whether that knowledge brings comfort or burden is complex. There is relief in explanation, but also the weight of genetic permanence. As medical students, we are often drawn to moments of acute intervention; thrombolysis administered, seizures terminated, lives saved in dramatic fashion. Yet this experience reminded me that pathology underpins those visible acts. Without the lab, clinical medicine operates in partial shadow. A mutation in a collagen gene does not announce itself loudly. It reveals itself through damaged vessels, through white matter rarefaction, through a young woman learning to navigate adulthood from a wheelchair. It reveals itself when someone decides to send a blood sample for sequencing. 

Among the thousands of pathology tests performed daily across the United Kingdom, many confirm what clinicians already suspect. Some refine diagnoses. A few transform understandings. This genetic test did more than explain a stroke - it revealed a lifelong vulnerability written into collagen itself. It demonstrated that beneath every clinical presentation lies an architecture; sometimes fragile, sometimes flawed and that pathology has the power not only to diagnose disease, but to tell its story. 

References available on our website.

We would also like to congratulate the second place entrants, Josiah Wilson and Tarun Mathew Doss.

Read their essays below: