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Macfarlane Burnet

Macfarlane Burnet

Lived 1899 – 1985.

Macfarlane Burnet’s best known contributions to science are:

  • the theory of acquired immunological tolerance, for which he received the Nobel Prize for Medicine or Physiology in 1960;
  • the theory of clonal selection, which he regarded as his most important work and is the basis of the science of molecular immunology.

A remarkably prolific researcher, he published over 400 original research papers and authored 10 books on virology, 11 on immunology, an autobiography, and several books about subjects such as ageing and genetics.

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Beginnings

Frank Macfarlane Burnet was born on September 3, 1899 in the small city of Traralgon, Victoria, Australia, which lies about 100 miles (160 km) south east of Melbourne.

His father, Frank Burnet, was a bank manager who had moved to Australia from Scotland as a young man. His mother, Hadassah Pollock Mackay, was the daughter of a Scottish school teacher. Frank Jr., the second of their seven children, was known to his family and forever more as Mac.

Mac’s elder sister Doris was mentally handicapped and took up most of her mother’s time. Mac’s father was a man of business, who enjoyed golf and fishing. Mac disliked sport, preferring to read. He grew to disapprove of religion because his father would attend the Presbyterian church, but also deal with businessmen whose practices did not seem very Christian to Mac.

Mac grew up shy and solitary.

Schooling & Development

In 1909, Mac’s father was transferred over 200 miles west by his bank to the country town of Terang. Now age 10, Mac was schooled at Terang’s primary school. He joined the Boy Scouts, loving the outdoor life, and he continued to enjoy reading, becoming a fan of H. G. Wells and George Bernard Shaw.

He also began a hobby that became a lifelong passion – beetle collecting. Initially he was hampered in his new hobby, because the only information about biology he could find was in a 50 year-old edition of the Chambers Encyclopedia. From this he learned about the theory of natural selection, still decidedly new when the encyclopedia was published.

As his interest in biology grew, his parents subscribed to the fortnightly magazine Harmsworth’s Natural History, and then, casting his net wider, Mac purchased books about beetles and insects by mail order from Melbourne.

Later, he quoted psychologist Anne Roe’s findings about research scientists, noting how well it described him:

Macfarlane Burnet“…socially late-maturing boys with strong hobbies and noticeable persistence in them… voracious if unselective readers throughout their childhood. Most regarded their fathers with great respect but felt somewhat distant from them.”
Macfarlane Burnet
Changing Patterns, 1968
 

In his final year at primary school, he obtained a full residential scholarship for Geelong College, a prestigious private school.

In 1913, age 13, Mac traveled 100 miles east to begin boarding at Geelong College. He had grown to love the outdoor life in Terang, and did not enjoy high school much. He was an academically inclined, bookish scholarship boy, not entirely comfortable with the other students, who were excessively wealthy, assertive, and whose lives seemed to revolve around sport.

Fearful of derision from his fellow students, he kept his devotion to the study of beetles secret.

He graduated from Geelong College in 1916 as its top student, winning a full residential scholarship to the University of Melbourne’s Ormond College.

Influenced by his high regard for Charles Darwin and H. G. Wells, and the need to make a career for himself, he decided to study medicine.

Melbourne and London

Burnet matriculated at the University of Melbourne in 1917, the penultimate year of World War I.

He joined the university’s army corp, not because he approved of war, but because he felt that after the war anyone who had not shown willingness to take part would find life difficult.

He graduated with a Bachelor of Medicine and a Bachelor of Surgery in 1922, age 22. He hoped to become a hospital doctor -he had felt a lot of job satisfaction while training in the operating theater and emergency department, but his hospital supervisor judged his personality was more suited to research work.

In 1923, he became senior resident pathologist at the Walter and Eliza Hall Institute at the Melbourne Hospital.

He left Australia in 1925 to work as an assistant curator at the Lister Institute in London, England. He was free to carry out his own research most of the time and he decided to study micro-organisms. The Institute was impressed by his ability, and awarded him a fellowship, allowing him to pursue his interests further.

In 1928, the University of London awarded him a Ph.D. for his research into bacteriophages – viruses that infect bacteria.

He returned to Melbourne in 1928 as Assistant Director of the Walter and Eliza Hall Institute and, apart from returning to London for a year in 1932-1933 he remained in Australia for the rest of his career. He was appointed Director of the Walter and Eliza Hall Institute in 1944, and also appointed Professor of Experimental Medicine at the University of Melbourne.

bacteriophage

Schematic of a typical bacteriophage. Courtesy Database Center for Life Science (DBCLS).

Macfarlane Burnet’s Contributions to Science

Burnet’s scientific discoveries and achievements were legion; he published over 400 papers documenting his own research work, mainly in the field of virology. It is, however, his work in immunology, only a minor part of his work, for which he is best remembered. Here we’ll concentrate on just two contributions: the theory of acquired immunological tolerance, for which he received a Nobel Prize; and the theory of clonal selection, which he believed was his most important work.

The Theory of Acquired Immunological Tolerance

How does your body know what is self and what is non-self? This is a question that fascinated Burnet. How can our body’s immune response tell the difference between our own cells and invading cells?

Burnet noted that our bodies do not make antibodies against their own cells. In 1949 he proposed, in a paper with Professor Frank Fenner, that if foreign cells are introduced into an embryo, then when the embryo develops into an independent individual, it will have no immune response to foreign cells of the type it encountered as an embryo: the embryo would have been made tolerant of the foreign cells. In other words, the immune system of an individual could be made to tolerate cells it would normally reject and attack.

In 1956, a team led by Peter Medawar at University College, London, confirmed Burnet’s theory with experiments on mice.

Normally, skin grafts from one mouse to another would fail, because the immune system of the mouse the skin was grafted to rejected the new skin. However, if a mouse at its embryo stage was exposed to cells from another mouse, then as an adult, it would accept a skin graft from that mouse. In other words, it was possible for foreign cells to be treated as ‘self.’

mouse embryo and adult

If cells from another mouse are introduced into an embryo at the right time, when the embryo grows into an adult, it will continue to tolerate cells from the other mouse. Embryo image by NIH, adult mouse image by Pogrebnoj Alexandroff.

The fact that tolerance of foreign cells could be acquired by a body led to advances in reducing the human immune response to transplants, allowing organ transplants to be carried out without rejection of the transplanted organ.

Burnet and Medawar shared the 1960 Nobel Prize in Physiology or Medicine for their discoveries.

Macfarlane Burnet“For me, acquired immunological tolerance means simply that the content of self components in the body has been enlarged by an experimental manipulation.”
Macfarlane Burnet
Nobel Lecture, 1960
 

The Theory of Clonal Selection

blood cells

A sample of various blood cells. A red blood cell (R) and lymphocyte (L) are marked.

Lymphocytes are a type of white blood cell that respond to invading cells, which are called antigens. They do this using antigen receptors – each lymphocyte cell has about 100,000 receptors on its surface.

Burnet proposed, correctly, that the antigen receptors on lymphocytes are specific to the lymphocyte. If a lymphocyte meets the antigen its receptors are programmed to fight, then this lymphocyte is triggered to make clones of itself, producing a large-scale immune response to the particular invading cell.

schematic of lymphocyte.

Schematic of lymphocyte. The blue receptors can bind only to a specific antigen that the lymphocyte targets. If this antigen is encountered, the lymphocyte will make clones of itself to respond to the threat of this specific invader.

Burnet explained that after we have been exposed to a disease, there is an immunological memory of the disease because there are two types of lymphocyte:

  • one type fights the infection immediately
  • the other persists for a long time, resulting in immunity

Burnet proposed that some receptors are a very precise match to antigens, while others are less precise to try to ensure some sort of immune response to virtually any invading pathogen.

Burnet’s clonal selection theory is the basis of the science of molecular immunology.

His theory led to the development of some of the most important drug treatments available today based on monoclonal antibodies – these are made by immune cells, all identical, that are all clones of a single parent cell. Today monoclonal antibodies can be made that can bind specifically to almost any substance.

Gustav Nossal“Burnet’s was a contemplative, almost a solitary, kind of genius. The majority of his papers were single-author works, using simple, elegant techniques, frequently of his own devising and requiring little more than a Pasteur pipette, a test tube, a fertile hen’s egg and a microscope.”
Gustav Nossal
Tribute to Sir Frank Macfarlane Burnet, 1985
 

Other Discoveries

In addition to his two biggest discoveries, Burnet also:

  • discovered the causes of Q-fever and psittacosis
  • described the recombination of influenza strains
  • described the epidemiology of herpes simplex
  • demonstrated (in part by injecting himself with the virus) that the myxomatosis virus does not attack humans
  • improved the methods for cultivating viruses in hens’ eggs: his methods are the basis of today’s methods

Prizes

Burnet was awarded the 1960 Nobel Prize in Physiology or Medicine for his discoveries. He had previously, in 1951, been knighted, becoming Sir Frank Macfarlane Burnet.

During his career, Burnet received many prestigious awards, including:

  • 1935: Stewart Prize of the British Medical Association
  • 1942: Fellow of the Royal Society of London
  • 1946: Honorary Doctor of Science, University of Cambridge
  • 1947: Royal Medal, Royal Society of London
  • 1950: Honorary Member, New York Academy of Sciences
  • 1951: Knight Bachelor
  • 1952: Lasker Award, American Public Health Association
  • 1952: Von Behring Prize, University of Marburg
  • 1953: Fellow of Royal College of Physicians, Edinburgh
  • 1954: Foreign Associate, US National Academy of Sciences
  • 1957: President of Australian and New Zealand Association for the Advancement of Science
  • 1958: Order of Merit
  • 1959: Copley Medal, Royal Society of London
  • 1960: Nobel Prize in Physiology or Medicine
  • 1960: Australian of the Year
  • 1962: Mueller Medal, Australian and New Zealand Association for the Advancement of Science
  • 1962: New York University Medal
  • 1969: Knight Commander of the Order of the British Empire
  • 1975: The Hebrew University of Jerusalem Jubilee Medal
  • 1977: Elizabeth II Jubilee Medal
  • 1978: Knight of the Order of Australia

Some Personal Details and the End

Burnet married Edith Linda Marston Druce in 1928. They had known each other in Australia, met again in London, and agreed to marry when they both got back to Australia. The couple had one son and two daughters: Ian, Elizabeth, and Deborah.

Although he officially retired in 1966, age 66, he remained at the University of Melbourne as Professor Emeritus and continued to have a secretary to help with his work. He wrote 13 books in the 1966-77 period.

His wife Linda died of lymphoid leukemia in 1973. In 1976, Burnet married Hazel Jenkin.

Burnet was:

  • a fast writer – often his first draft was identical to the final copy
  • an atheist who supported euthanasia
  • strongly anti-smoking – he quit in the 1950s
  • so moved by the death of his first wife that he could barely do any work for a year
  • highly skeptical about the benefits of molecular biology

Macfarlane Burnet died, age 85, of cancer of the rectum, on August 31, 1985 at his son’s home in Port Fairy. The Australian Government organized a state funeral in his honor at the Toorak Uniting Church, Melbourne. He was buried at Tower Hill Cemetery, Victoria, close to a wildlife reserve.

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Further Reading
Sir Frank Macfarlane Burnet
Changing Patterns: An Atypical Autobiography
Heinemann, 1968

G. J. V. Nossal
Tribute to Sir Frank Macfarlane Burnet
Journal and proceedings of the Royal Society of New South Wales; Vol. 1 No. 18, pp. 1-9, 1985

Christopher Sexton
The Seeds of Time: The Life of Sir Macfarlane Burnet
Oxford University Press, 1991

Creative Commons
Image of bacteriophage courtesy of Database Center for Life Science (DBCLS) under the Creative Commons Attribution 3.0 Unported license.

Image of adult mouse courtesy of Pogrebnoj Alexandroff under the Creative Commons Attribution-Share Alike 3.0 Unported license.

Image of Gustav Nossal courtesy of Mark Coulson, 5th World Conference of Science Journalists under the Creative Commons Attribution 2.0 Generic license.

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