At the age of 67, Professor Jérôme
Lejeune succumbed to cancer, a debilitating disease to which he had devoted
part of his research activities.
Jérôme Lejeune grew up as a child in the Paris region. We
met in a Paris barracks, on our way to military service in Germany. He
had just started «genetics» in Professor Raymond Turpin's
team and I had done the same under Professor Maurice Lamy. Despite this
rivalry at the top, we always remained, up to the end, the best of friends
in the world.
Very early, Jérôme Lejeune was fascinated by the enigma of
Down's syndrome. Every possible theory had been put forward to explain
such a «condition» : recessive heredity, dominant heredity,
chromosomic anomaly. Jérôme Lejeune thought that it could
be due to an anomaly similar to Bar's duplication described in the drosophile.
Through his work, he encountered Doctor Marthe Gautier who taught him
the techniques for cultivating fibroblasts, which she had just acquired
in the United States. This collaboration, together with the development
of the «first» cytogenetic techniques, led in 1959 to the
publication in the Academy of Science Reports of a paper describing the
presence in Mongol children of a small supernumerary acrocentric chromosome.
This discovery, of what was later to become known as Trisomy 21, was of
considerable importance, since it opened the way for the new science of
cytogenetics, human first, then animal. Its exponential development in
many directions, led to knowledge of the secrets of hereditary science.
Jérôme Lejeune's discoveries in cytogenetics followed on
in rapid succession : the description of cat cry syndrome, by deletion
of 5p ; the first translocation of the major acrocentrics ; numerous partial
aneusomies ; the theory of rings... He put forward the concept of types
and countertypes, by which two syndromes, one due to monosomy, and the
other due to trisomy, for the same chromosomic segment, are opposed by
their clinical signs, for example brachy- versus dolichomesophalangy.
Another contribution was monozygotic heterocaryotic gemellite, characterised
by the existence of twins which are «identical» by their blood
groups and their immunological tolerance to reciprocal skin grafts, but
which differ by a single pair of chromosomes. The first of Jérôme
Lejeune's observations concerned twins, one a male, 46, XY and the other
suffering from Turner's syndrome, 45, X. This was the result, according
to him, of two accidents occurring simultaneously: the formation of monozygotic
twins and the formation of a mosaic 46, XY/45, X by loss of the Y in one
of the twins. Other observations were published by Jérôme
Lejeune, in particular a monozygotic Trisomic 21/Normal couple.
And especially ! Jérôme Lejeune resorted to this form of
gemellity to explain the occurrence, during the evolution of species,
of an ancestral male/female couple where the individuals bore the same
modification: the translocation of chromosome 2, reducing the chromosomic
number from N=48 in Pongidae to N=46 in man. This couple could only be
Adam and Eve.
In addition to clinical, evolutionary and gemellar cytogenetics, Jérôme
Lejeune also contributed to knowledge of cancerous cytogenetics by reporting
the first observation of clonal evolution in a Trisomic child suffering
from leukaemia. With all the regret which one can imagine, he also realised
with hindsight, that on one of his chronic myeloid leukaemia slides ,
he had a superb Philadelphia «princeps» chromosome which had…
escaped him. Even, during the last weeks of his life, aware of his illness,
he again devoted his research to finding an explanation for carcinogenesis.
With his own doctor, Professor Lucien Israël they sought to correlate
cancerogenesis and the evolution of the nervous system in higher organisms.
Mere days before the end, Jérôme telephoned me to say that
he was struck by the fact that cancer only appears after a certain degree
of phylogenetic evolution of living beings, and spares the more primitive
species. He asked me whether I had the slightest notion on the subject.
I was only able to answer «unfortunately not».
But that is not all of Jérôme Lejeune's creative activity.
For a while he was enthusiastic about steric biochemistry. He built molecular
models, his «balls», which invaded his laboratory like poppies.
His research themes were as diverse as the transmission of nervous current
in the synapses or the identification of a «code of congruence»
explain the recognition of ADN sequences by protein molecules during genetic
or hormonal regulation.
But Jérôme Lejeune's obsession was always to detect the mechanisms
of mental deficiency, in order to be able to treat it. And throughout
the last years, there was a veritable whirlwind of biochemical flows drawing
one another along, like circular gears. His pen sketches were stupefying.
His hobbyhorse was the family of folates whose role, in his view, is so
Jérôme Lejeune's imaginative expansion was virtually boundless,
each day coming up with a new idea, a new concept, a new theory.
As Professor of Fundamental Genetics, Jérôme Lejeune was
covered with honours : member of the Institute, member of the Pontifical
Academy of Sciences, first president of the Pontifical Academy for Life,
member of the Academy of Medicine, doctor honoris causa of numerous foreign
universities. He was never awarded the Nobel prize, although his scientific
achievements would have more than justified it. And for reasons way beyond
purely scientific considerations. They are manifold. They are part of
the extra-scientific «environment» of the «erudite»
Lejeune. We all know that his moral convictions, proclaimed urbi et orbi,
generated both veneration and shame.
I should like to finish by saying quite simply, that for his funeral,
the cathedral of Notre Dame de Paris was full, full of people from the
world over, a living witness to Jérôme Lejeune's notoriety
and universal esteem. I should like to say also, that he left an exemplary
wife who remained his unswerving companion from the early days, five children,
and twenty-seven grandchildren. Irrefutable proof of his respect for life.
Jérôme Lejeune was born
in 1926 in Montrouge, a Parisian suburb.
He studied medicine and became a research scientist with the CNRS
(French National Scientific Research Organisation) in 1952.
He became the French international expert on nuclear radiation.
In July 1958,
whilst examining the chromosomes of a child suffering from "Down's
syndrome", he discovered the existence of a chromosome too
many on the 21st pair. For the first time in the world, a link was
established between mental debility and a chromosomic aberration.
he became the first professor of Fundamental Genetics at the Paris
Whilst keeping himself readily available for the families of handicapped
children who he treated, he took an active part in thousands of
he became a member of the Pontifical Science Academy.
he was elected as a member of the Academy of Moral and Political
In 1983, he
joined the National Medical Academy. He was made an honorary doctor,
was granted membership or received awards from many other foreign
academies, universities and learned societies.
he was appointed President for life of the Pontifical Academy.
He died on 3rd April 1994,
with the sad feeling of failing in his mission : "I was the
doctor who was supposed to cure them and as I leave, I feel I am
Professor Lejeune received numerous
awards for his work on chromosomic pathologies, among which :
in 1962, the prestigious Kennedy prize
in 1969, the William Allen Memorial Award
in 1993, the Griffuel prize, for his pioneering work on chromosomic
anomalies in cancer