Jérôme Lejeune (1926-1994): A Pioneer in Uncovering the Connection Between Congenital Conditions and Chromosomal Anomalies.

Jérôme Lejeune was a French physician and geneticist whose crucial contribution to the field of medicine was the discovery of an extra copy of chromosome 21 in those presenting with a range of physical and developmental anomalies known as Down syndrome. From this discovery on, the condition had a new name (trisomy 21) and a specific scientific explanation that left no room for discrimination against those affected and their parents. Lejeune promoted the idea that a medical doctor should hate the condition and love the patient: while working to find a cure for trisomy 21, Lejeune was also able to reassure his patients and their families and lead them out from under a long-standing stigma inflicted upon them. He was also considered an expert in nuclear radiation and its effects on human genetic material.