Jérôme Lejeune

French pediatrician and geneticist

Jérôme Lejeune

Jérôme Jean Louis Marie Lejeune (13 June 1926 – 3 April 1994) was a French pediatrician and geneticist renowned for his discovery of the link between chromosomal abnormalities and Down syndrome. His work laid the foundation for modern cytogenetics and significantly advanced the understanding of genetic disorders.

Early life and education

Jérôme Lejeune was born in Montrouge, a suburb of Paris, France. He pursued his medical studies at the University of Paris, where he developed a keen interest in genetics and pediatrics. Lejeune completed his medical degree in 1951 and subsequently began his research career.

Discovery of trisomy 21

In 1958, Lejeune made a groundbreaking discovery that would change the field of genetics. He identified that Down syndrome, a condition characterized by intellectual disability and distinct physical features, was caused by an extra copy of chromosome 21, a condition now known as trisomy 21. This discovery was pivotal in establishing the role of chromosomal abnormalities in genetic disorders.

Career and contributions

Lejeune's work extended beyond his discovery of trisomy 21. He was a pioneer in the field of cytogenetics, the study of chromosomes and their relation to disease. Lejeune's research contributed to the understanding of various genetic conditions, including Cri du chat syndrome and Fragile X syndrome.

Throughout his career, Lejeune was a vocal advocate for individuals with genetic disorders. He emphasized the importance of treating patients with dignity and respect, and he was a proponent of ethical considerations in genetic research.

Personal life

Lejeune was a devout Catholic and his faith influenced his views on medical ethics. He was a strong opponent of abortion and euthanasia, advocating for the protection of life from conception to natural death. Lejeune's beliefs often brought him into conflict with prevailing scientific and social norms.

Legacy

Jérôme Lejeune's contributions to genetics have had a lasting impact on the field. His discovery of the chromosomal basis of Down syndrome paved the way for advances in prenatal diagnosis and genetic counseling. In recognition of his work, Lejeune received numerous awards and honors, including the William Allan Award from the American Society of Human Genetics.

After his death, the Jérôme Lejeune Foundation was established to continue his work in research and advocacy for individuals with genetic disorders.

Related pages

• Down syndrome
• Cytogenetics
• Genetic disorders
• Trisomy