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Jérôme Lejeune

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Jérôme Lejeune
Born 13 June 1926, Montrouge, France
Died 3 April 1994, Paris, France
State of life Married lay faithful; physician; geneticist
Church or affiliation Latin Church; Archdiocese of Paris
Ecclesial status Venerable; heroic virtues recognized on 21 January 2021
Recognition Roman cause remains in progress

Jérôme Lejeune was a French physician and geneticist known for work identifying the chromosomal basis of Down syndrome, care of patients, and defense of unborn human life.

Overview

Jérôme Jean Louis Marie Lejeune (French pronunciation: [ʒeʁom ʒɑ̃ lwi maʁi ləʒœn]; 13 June 1926 – 3 April 1994) was a French pediatrician and geneticist. He is best known for his work on the links between chromosome abnormalities like Down syndrome (trisomy-21) and cri du chat syndrome. He is also known for his subsequent strong opposition to the use of amniocentesis prenatal testing for eugenic purposes through selective and elective abortion.[1] He was declared Venerable by Pope Francis on 21 January 2021.[2]

Life

Origins and formation

Jérôme Lejeune studied medicine in postwar France, married Birthe Bringsted, and became a father of five. Working with Raymond Turpin, Marthe Gautier, and other researchers, he participated in the identification of trisomy 21 as the chromosomal condition associated with Down syndrome. Accurate history credits the team and notes the continuing dispute over attribution rather than naming a solitary discoverer. The dates and circumstances matter because Catholic biography begins with a real person formed in family, place, and history; later ecclesial recognition does not erase complexity or turn childhood details into retrospective proof of sanctity.

Vocation and service

Lejeune combined laboratory genetics with clinical care, learning from children and families and seeking treatments for intellectual disability. He opposed stigmatizing language and insisted that diagnosis never diminished personhood. As prenatal diagnosis developed, he became a prominent critic of abortion and embryo experimentation, accepting professional hostility while continuing scientific work and consultation. His or her vocation is therefore read through Baptism, prayer, the sacraments, and concrete service rather than through fame alone. The Catholic Church tests a whole pattern of life, including responsibilities, relationships, and growth in virtue.

Christian witness

His Catholic witness joined reasoned biological argument, prayer, family life, and attention to individual patients. Ethical conviction did not make every scientific hypothesis correct, and contemporary genetics must be assessed by normal peer review. The cause evaluates whether charity and prudence shaped his defense of life; it does not turn his technical publications into magisterial teaching or authorize contempt toward frightened parents. This witness belongs within the universal call to holiness: communion with Christ in the Eucharist and attentiveness to Scripture bear fruit in charity. It should be remembered truthfully, without making hardship desirable or treating every disputed judgment as canonized.

John Paul II appointed Lejeune the first president of the Pontifical Academy for Life in 1994, but illness allowed only brief service before his death on Easter morning. Friendship with a pope and leadership of a pontifical body are not themselves evidence of sanctity. Testimony instead emphasizes fidelity in marriage, professional generosity, courage under criticism, and hope amid cancer. Careful Catholic remembrance distinguishes documented events, contemporary interpretation, and the Church's later canonical judgment. That discipline protects both devotion and historical truth, allowing genuine limitations or controversy to be named without denying the graces evident in the life.

Ecclesial recognition

Cause and present status

Pope Francis authorized the decree recognizing Jérôme Lejeune's heroic virtues on 21 January 2021, conferring the title Venerable. A Holy See audience in June 2026 still used that title while encouraging the foundation's service. No beatification or miracle decree had been promulgated by 30 August 2026. Cause terminology is juridically exact: opening a cause, recognizing heroic virtues, beatification, and canonization are distinct acts. The status stated here follows the latest official Holy See or competent diocesan record available on 30 August 2026.[3][4]

Liturgical and devotional scope

Recognition as Venerable does not authorize public liturgical cult, a feast, or veneration owed to a Blessed. Catholics may privately seek Venerable Jérôme Lejeune's intercession and report alleged favors through the cause. Medical centers and advocacy groups may honor his legacy, but their work and his canonical process should remain distinguishable.

Career

Trisomy 21

In 1958, while working in Raymond Turpin’s laboratory with Marthe Gautier, Jérôme Lejeune reported that he had discovered that Down syndrome was caused by an extra copy of chromosome 21. According to Lejeune's laboratory notebooks, he made the observation demonstrating the link on 22 May 1958. The discovery was published by the French Academy of Sciences with Lejeune as first author, Gautier as second author, and Turpin as senior author.[5] In 2009, co-author Gautier claimed that the discovery was based on fibroblast tissue samples that she had prepared and on which she noticed the discrepancy in chromosome count.[6] This discovery was the first time that a defect in intellectual development was shown to be linked to chromosomal abnormalities.[7][8]

Origins of the discovery

In the early 1950s, Lejeune joined the department headed by Turpin, who suggested that Lejeune focus his research on the causes of Down syndrome. As early as 1953, the two men showed a connection between an individual's characteristics and his or her dermatoglyphs–the fingerprints and lines on the hand. The structure of these lines, which remain the same throughout the individual's life, is determined during the earliest stages of embryo development. As Lejeune and Turpin studied the hands of children with Down syndrome, they deduced that their dermatoglyphic anomalies appeared during embryo formation.

In 1956, biologists from Lund University in Sweden announced that humans have exactly 46 chromosomes. Turpin had many years earlier proposed the idea of culturing cells to count the number of chromosomes in trisomy. Gautier had recently joined the pediatrics group he headed at the Armand-Trousseau Hospital, and she offered to attempt this, since she had been trained in both cell culture and tissue staining techniques in the United States.[9] Turpin agreed to provide her with tissue samples from patients with Down syndrome. With very limited resources Gautier set up the first in vitro cell culture laboratory in France And discovered the chromosome discrepancy and tissue samples of trisomy patients.[10][11]

At the time, the laboratories at the Armand-Trousseau hospital did not have a microscope capable of capturing images of the slides. Gautier entrusted her slides to Lejeune, a fellow researcher at CNRS, who offered to take pictures in another laboratory better equipped for this task.[12] In August 1958 the photographs identified the supernumerary chromosome in patients with Down syndrome.[13]

The laboratory notebook begun by Lejeune on 10 July 1957 indicates that on 22 May 1958 he succeeded in showing, for the first time, the presence of 47 chromosomes in a child with Down syndrome. This was two years after Tjio and Levan had proven that the human species has 46 chromosomes. On 13 June 1958, Lejeune identified an additional case, and a photo of the karyotype met with skeptical interest at the International Congress of Genetics in Montreal. The international community did not grasp the full impact of his discovery until 26 January 1959, when the French Academy of Sciences published the team's first paper presenting three case studies of children with Down syndrome.[5]

In January 1959, by studying new cases[13] and to forestall similar research by the English,[9] the Trousseau laboratory announced the results of the analysis of the slides in the Proceedings of the Academy of Sciences through a paper published with Lejeune as first author, Gautier second (her surname misspelled as "Gauthier") and Turpin last author.[14]

On 16 March 1959, another presentation to the Academy of Sciences confirmed the team's initial publication, this time covering nine cases. In April 1959, the English team of Brown and Jacobs corroborated these results, citing the initial January 1959 publication by Lejeune, Gautier, and Turpin. “Mongolism” had become trisomy 21. The discovery opened up a new field of investigation for modern genetics and laid the foundation for a new discipline: cytogenetics.

Dispute of the discovery

Gautier has criticized the portrayal of Lejeune as the sole discoverer of trisomy 21.[15] She has stated in interviews and in a 2009 article in the journal Médecine/Sciences that she worked without assistance from Lejeune to develop the necessary cytological and histological resources and techniques, and used these to prepare microscope slides showing the trisomy. By her account, Lejeune took her slides away under the pretence of having them photographed for her, but instead presented them as his own work at a conference and in a subsequent publication.[16] Jean-Marie Le Méné, president of the Jérôme Lejeune Foundation, maintains that there is no evidence that Gautier made the key discovery.[17]

Gautier does not dispute that Lejeune identified the 47th chromosome as an extra copy of chromosome 21, but maintains that she was the first the notice the abnormal count.[18] In a personal letter from 5 November 1958 to Gautier, Lejeune wrote appreciatively about her "preparations" that were instrumental to the discovery,[15] and Gautier appeared as co-author on two seminal papers: one on the discovery of trisomy 21[5] and a second one about the cell culture techniques that Gautier had learned during a scholarship (1955–1956) at Harvard, Boston which made the discovery possible.[19]

Later research and recognition

Continuing his work in genetics, Lejeune described several other diseases related to chromosomal abnormalities. In 1963 he identified Cri du Chat syndrome, caused by a missing segment in the short arm of chromosome 5, and in 1966 he described 18q-Syndrome, which results from loss of the distal portion of the long arm of chromosome 18. Lejeune also discovered the Dr phenotype (a malformation syndrome in which a ring-shaped chromosome replaces chromosome 13), and he identified trisomies on chromosome 9 in 1970 and chromosome 8 in 1971.

In a 1963 presentation before the French Academy of Sciences, Lejeune showed that monosomy—the absence of a specific segment of the genome—could also result in a clinically recognizable disease. Several years later, a group of American scientists came to Paris to conduct an independent investigation of Lejeune's discovery, and in 1962 the President of the United States personally presented him with the Kennedy Prize. In 1964, the first chair of human genetics was created at the Paris School of Medicine, and Lejeune was named to fill it. The appointment was highly unusual: only a groundbreaking discovery allowed a candidate to be named a professor of medicine without successfully completing a competitive residency examination.

In 1969, Lejeune's work earned him the William Allan Award from the American Society of Human Genetics. As of 2013 he was the only Frenchman to have won it.[20]

Anti-abortion advocacy

Although Lejeune's discoveries paved the way for new therapeutic research into how changes in gene copy number could cause disease, they also led to the development of prenatal diagnosis of chromosome abnormalities and thence to abortions of affected pregnancies. This was very distressing to Lejeune, a devout Catholic, and led him to begin his fight for the anti-abortion cause.

Lejeune opposed the authorization in 1967 for women to use contraception as well as the Peyret laws in 1970 to render legal the interruption of pregnancy in case of fetal abnormalities. He also opposed the Veil Law ("Loi Veil" 1975) authorizing voluntary interruption of pregnancy.[21][22]

After receiving the Allan prize, Lejeune gave a talk to his colleagues which concluded by explicitly questioning the morality of abortion, an unpopular viewpoint in the profession. In a letter to his wife, Lejeune wrote "today, I lost my Nobel prize in Medicine."[23][24]

In 1975, after one of his public appearances in Paris on the beginning of life, Lejeune met Wanda Półtawska, director of the Catholic Institute for the Family in Kraków. Later that year, Półtawska contacted Lejeune twice, asking him to speak at conferences on the beginning of life that she was organizing with one of her close friends, Monsignor Karol Wojtyla, then Cardinal-Archbishop of Krakow. On 16 October 1978 Wojtyla was elected Pope John Paul II.

Afterward, Lejeune regularly traveled to Rome to meet with the pope, to attend meetings of the Pontifical Academy of Sciences, and to participate in other church events, such as the 1987 Synod of Bishops. The pope wanted to name Lejeune as the president of a new pontifical academy that was dear to his heart: the Pontifical Academy for Life.[25] Lejeune painstakingly drafted its bylaws and the oath of the Servants of Life that each member of the academy must take. A few years later, during his visit to Paris for World Youth Day 1997, John Paul II visited Lejeune's grave in Châlo-Saint-Mars.

Lejeune was diagnosed with lung cancer in November 1993. Lejeune served as president of the Academy for only a few weeks before his death in April 1994.

Beatification process

Lejeune was titled a Servant of God by the Catholic Church upon the opening of his cause for beatification, which is being postulated by a member of the Abbey of Saint Wandrille in France. On 21 January 2021, Pope Francis declared Lejeune's heroic virtue, and Lejeune was indicated venerable.[2]

Honors, awards and credentials

Jérôme Lejeune received many distinctions during his lifetime. He was a member of:

Lejeune held honorary doctorates from:

His international positions included:

Consulting expert on human genetics (1962)

  • International Commission on Radiological Protection

Committee member (1963)

  • United Nations
    • French expert to the Scientific Committee on the Effects of Atomic Radiation

Selected works

See also

References

  1. Back to citation Hulten, Maj (11 April 1994). "Obituary: Professor Jerome Lejeune". The Independent. Retrieved 5 March 2014.
  2. Back to citation occurrence 2.0 Back to citation occurrence 2.1 "French doctor who made Down discovery closer to sainthood". AP NEWS. 2021-01-21. Retrieved 2021-01-21.
  3. Back to citation Holy See heroic-virtue decree — Official ecclesial source documenting the recognition, present cause status, and principal facts used for Jérôme Lejeune.
  4. Back to citation Leo XIV audience with Lejeune Foundation — Official ecclesial source documenting the recognition, present cause status, and principal facts used for Jérôme Lejeune.
  5. Back to citation occurrence 5.0 Back to citation occurrence 5.1 Back to citation occurrence 5.2 Lejeune, Jerome; Gauthier, Marthe; Turpin, Raymond (1959). "Les chromosomes humains en culture de tissus [The human chromosomes in tissue culture]". Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences (in French) (248). présentée par M. Léon Binet: 602–603.
  6. Back to citation "The history of cytogenetics" S. Gilgenkrantz, E.M. Rivera, March 2003 p. 5
  7. Back to citation Gautier, Marie; Harper, P. S. (2009). "Fiftieth anniversary of trisomy 21: returning to a discovery" (PDF). Human Genetics. 126 (2): 317–324. doi:10.1007/s00439-009-0690-1. S2CID 30299551.
  8. Back to citation "Trisomie: une pionnière intimidée". Le Monde. February 2004. Retrieved 16 May 2014.
  9. Back to citation occurrence 9.0 Back to citation occurrence 9.1 Gautier, Marthe; Harper, Peter S. (2009). "Fiftieth anniversary of trisomy 21: returning to a discovery". Human Genetics. 126 (2): 317–324. doi:10.1007/s00439-009-0690-1. ISSN 0340-6717. S2CID 30299551.
  10. Back to citation "The history of cytogenetics Portraits of some pioneers" S. Gilgenkrantz & E.M. Rivera, 2003 in "Annales de génétique"
  11. Back to citation "After More Than 50 Years, a Dispute Over Down Syndrome Discovery". www.science.org. Retrieved 2025-03-14.
  12. Back to citation Pain, Elisabeth (11 February 2014). "After More Than 50 Years, a Dispute Over Down Syndrome Discovery". Science Now. 343 (6172): 720. Bibcode:2014Sci...343.720P.
  13. Back to citation occurrence 13.0 Back to citation occurrence 13.1 Le Méné, Jean-Marie (2009). "La découverte de la trisomie 21". Retrieved 9 February 2014.
  14. Back to citation Lejeune, Jérôme; Gauthier, Marthe; Turpin, Raymond (1959). "Les chromosomes humains en culture de tissus". Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences. 248 (1): 602–603.
  15. Back to citation occurrence 15.0 Back to citation occurrence 15.1 Gautier, Marthe and Peter S. Harper (2009). "Fiftieth anniversary of trisomy 21: returning to a discovery" (PDF). Human Genetics. 126 (2): 317–324. doi:10.1007/s00439-009-0690-1. S2CID 30299551.
  16. Back to citation Gautier, Marthe and Peter S. Harper (2009). "Fiftieth anniversary of trisomy 21: returning to a discovery" (PDF). Human Genetics. 126 (2): 317–324. doi:10.1007/s00439-009-0690-1. S2CID 30299551; "Trisomie: une pionnière intimidée". Le Monde. 2014-02-03. Retrieved 16 May 2014; "La vieille dame et les huissiers de la Fondation Lejeune". Le Monde. February 2014. Retrieved 16 May 2014.
  17. Back to citation Casassus, Barbara (2014). "Down's syndrome discovery dispute resurfaces in France. Debate flares over who discovered extra chromosome that causes the disease". Nature News. Feb 11, 2014. doi:10.1038/nature.2014.14690. S2CID 75454283.
  18. Back to citation Pain, Elisabeth (2014). "After More Than 50 Years, a Dispute Over Down Syndrome Discovery". Science. 343 (6172): 720–721. Bibcode:2014Sci...343.720P. doi:10.1126/science.343.6172.720. PMID 24531949.
  19. Back to citation Lejeune, Jerome; Turpin, Raymond; Gautier, Marthe (1960). "Étude des chromosomes somatiques. Technique pour la culture de fibroblastes in vitro" [Study of somatic chromosomes. Technique to culture fibroblasts in vitro]. Revue Française d'Études Cliniques et Biologiques. 5: 406–408.
  20. Back to citation "Past ASHG Award recipients". Archived from the original on 3 October 2014. Retrieved 10 February 2014.
  21. Back to citation "Chronologie – Contraception et IVG, 25 ans après la loi Veil – Dossiers – La Documentation française" (in French). Ladocumentationfrancaise.fr. Retrieved 3 March 2014.
  22. Back to citation Gilgenkrantz, S; Rivera, E.M (2003). "The history of cytogenetics Portraits of some pioneers" (PDF). Annales de Génétique. 46 (4): 433–442. doi:10.1016/S0003-3995(03)00012-1. PMID 14659778. Retrieved 3 March 2014.
  23. Back to citation Benderly, Beryl Lieff. "UPDATED: A scientist saint?". Science. American Association for the Advancement of Science. Retrieved 10 May 2019.
  24. Back to citation Smith, Peter Jesserer (30 March 2014). "Jerome Lejeune, Walking in the Footsteps of St. Thomas More". National Catholic Register. EWTN. Retrieved 10 May 2019.
  25. Back to citation "French Pro-Life Geneticist Jerome Lejeune to be Considered for Catholic Beatification". Cardinalrating.com. Archived from the original on 2014-02-22. Retrieved 3 March 2014.
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