Elizabeth Blackburn

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Elizabeth Blackburn
AC FRS FAA FRSN
Elizabeth Blackburn CHF Heritage Day 2012 Rush 001.JPG
With AIC Gold Medal, 2012
Born
Elizabeth Helen Blackburn

(1948-11-26) 26 November 1948 (age 75)
Hobart, Tasmania, Australia
CitizenshipAustralian and American
Alma mater
Awards
Scientific career
FieldsMolecular biology
Institutions
Thesis Sequence studies on bacteriophage ØX174 DNA by transcription  (1974)
Doctoral advisor Frederick Sanger [1]
Doctoral students Carol W. Greider
Website biochemistry2.ucsf.edu/labs/blackburn

Elizabeth Helen Blackburn, AC FRS FAA FRSN [2] (born 26 November 1948) is an Australian-American Nobel laureate who is the former president of the Salk Institute for Biological Studies. [3] In 1984, Blackburn co-discovered telomerase, the enzyme that replenishes the telomere, with Carol W. Greider. For this work, she was awarded the 2009 Nobel Prize in Physiology or Medicine, sharing it with Carol W. Greider and Jack W. Szostak, becoming the first Australian woman Nobel laureate.

Contents

She also worked in medical ethics, and was controversially dismissed from the Bush administration's President's Council on Bioethics. 170 scientists signed an open letter to the president in her support, maintaining that she was fired because of political opposition to her advice. [4]

Early life and education

Profile of Elizabeth Blackburn created by the organisation Science for All as part of the UN's International Day of Women and Girls in Science Blackburn USE.png
Profile of Elizabeth Blackburn created by the organisation Science for All as part of the UN's International Day of Women and Girls in Science

Elizabeth Helen Blackburn, the second of seven children, was born in Hobart, Tasmania, on 26 November 1948, with both her parents being family physicians. [5] [6] Her family moved to the city of Launceston when she was four, where she attended the Broadland House Church of England Girls' Grammar School (later amalgamated with Launceston Church Grammar School) until the age of sixteen.

Upon her family's relocation to Melbourne, she attended University High School, and ultimately gained very high marks in the end-of-year final statewide matriculation exams. [7] She went on to earn a Bachelor of Science in 1970 and Master of Science in 1972, both from the University of Melbourne in the field of biochemistry. Blackburn then went to receive her PhD in 1975 from Darwin College at the University of Cambridge, [6] for work she did with Frederick Sanger at the MRC Laboratory of Molecular Biology developing methods to sequence DNA using RNA, as well as studying the bacteriophage Phi X 174. [5] [8]

Career and research

During her postdoctoral work at Yale, Blackburn was doing research on the protozoan Tetrahymena thermophila and noticed a repeating codon at the end of the linear rDNA which varied in size. [9] Blackburn then noticed that this hexanucleotide at the end of the chromosome contained a TTAGGG sequence that was tandemly repeated, and the terminal end of the chromosomes were palindromic. These characteristics allowed Blackburn and colleagues to conduct further research on the protozoan. Using the telomeric repeated end of Tetrahymena, Blackburn and colleague Jack Szostak showed the unstable replicating plasmids of yeast were protected from degradation, proving that these sequences contained characteristics of telomeres. [9] This research also proved the telomeric repeats of Tetrahymena were conserved evolutionarily between the species. [9] Through this research, Blackburn and collaborators noticed the replication system for chromosomes was not likely to add to the lengthening of the telomere, and that the addition of these hexanucleotides to the chromosomes was likely due to the activity of an enzyme that is able to transfer specific functional groups. [9] The proposition of a possible transferase-like enzyme led Blackburn and PhD student Carol W. Greider to the discovery of an enzyme with reverse transcriptase activity that was able to fill in the terminal ends of telomeres without leaving the chromosome incomplete and unable to divide without loss of the end of the chromosome. [10] This 1985 discovery led to the purification of this enzyme in lab, showing the transferase-like enzyme contained both RNA and protein components. [9] The RNA portion of the enzyme served as a template for adding the telomeric repeats to the incomplete telomere, and the protein added enzymatic function for the addition of these repeats.Through this breakthrough, the term "telomerase" was given to the enzyme, solving the end-replication process that had troubled scientists at the time. [10]

Telomerase

In 1984, Blackburn was a biological researcher and professor of biology and physiology at the University of California, San Francisco, studying the telomere, a structure at the end of chromosomes that protects the chromosome.

Telomerase works by adding base pairs to the overhang of DNA on the 3' end, extending the strand until DNA polymerase and an RNA primer can complete the complementary strand and successfully synthesize the double-stranded DNA. Since DNA polymerase only synthesizes DNA in the leading strand direction, the shortening of the telomere results. [11] Through their research, Blackburn and collaborators were able to show that the telomere is effectively replenished by the enzyme telomerase, which conserves cellular division by preventing the rapid loss of genetic information internal to the telomere, leading to cellular aging. [9]

On 1 January 2016, Blackburn was interviewed about her studies, discovering telomerase, and her current research. When she was asked to recall the moment of telomerase discovery she stated: [12]

Carol had done this experiment, and we stood, just in the lab, and I remember sort of standing there, and she had this – we call it a gel. It's an autoradiogram because there were trace amounts of radioactivity that were used to develop an image of the separated DNA products of what turned out to be the telomerase enzyme reaction. I remember looking at it and just thinking, 'Ah! This could be very big. This looks just right.' It had a pattern to it. There was a regularity to it. There was something that was not just sort of garbage there, and that was really kind of coming through, even though we look back at it now, we'd say, technically, there was this, that, and the other, but it was a pattern shining through, and it just had this sort of sense, 'Ah! There's something real here.' But then, of course, the good scientist has to be very skeptical and immediately say, 'Okay, we're going to test this every way around here, and really nail this one way or the other.' If it's going to be true, you have to make sure that it's true, because you can get a lot of false leads, especially if you're wanting something to work. [12]

In 1978, Blackburn joined the faculty of the University of California, Berkeley, in the Department of Molecular Biology. In 1990, she moved across the San Francisco Bay to the Department of Microbiology and Immunology at the University of California, San Francisco (UCSF), where she served as the Department Chair from 1993 to 1999 and was the Morris Herzstein Professor of Biology and Physiology at UCSF. Blackburn became a Professor Emeritus at UCSF at the end of 2015. [13] [14]

Blackburn co-founded the company Telomere Health which offers telomere length testing to the public, but later severed ties with the company. [15] [16]

In 2015, Blackburn was announced as the new President of the Salk Institute for Biological Studies in La Jolla, California. "Few scientists garner the kind of admiration and respect that Dr. Blackburn receives from her peers for her scientific accomplishments and her leadership, service and integrity", says Irwin M. Jacobs, chairman of Salk's Board of Trustees, on Blackburn's appointment as President of the institute. "Her deep insight as a scientist, her vision as a leader, and her warm personality will prove invaluable as she guides the Salk Institute on its continuing journey of discovery".  In 2017, she announced her plans to retire from the Salk Institute the following year. [17]

Nobel Prize

For their research and contributions to the understanding of telomeres and the enzyme telomerase, Elizabeth Blackburn, Carol Greider, and Jack Szostak were awarded the 2009 Nobel Prize in Physiology or Medicine. The substantial research on the effects of chromosomal protection from telomerase, and the impact this has on cellular division has been a revolutionary catalyst in the field of molecular biology. [18] For example, the addition of telomerase to cells that do not possess this enzyme has shown to bypass the limit of cellular ageing in those cells, thereby linking this enzyme to reduced cellular aging. [18] The addition of telomerase, and the presence of the enzyme in cancer cells has been shown to provide an immunity mechanism for the cell in proliferating, linking the transferase activity to increased cellular growth and reduced sensitivity for cellular signaling. Telomeres are also believed to play an important role in certain types of cancers, including pancreatic, bone, prostate, bladder, lung, kidney, and head and neck cancer. [19] The importance of discovering this enzyme has since led her continued research at the University of California San Francisco, where she studies the effect of telomeres and telomerase activity on cellular aging. [20]

Bioethics

Blackburn was appointed a member of the President's Council on Bioethics in 2002. [21] She supported human embryonic cell research, in opposition to the Bush administration. Her Council terms were terminated by White House directive on 27 February 2004. [22] Dr. Blackburn believes that she was dismissed from the Council due to her disapproval of the Bush administration's position against stem cell research. [23] This was followed by expressions of outrage over her removal by many scientists, 170 of whom signed an open letter to the president maintaining that she was fired because of political opposition to her advice. [24]

Scientists and ethicists at the time even went as far as to say that Blackburn's removal was in violation of the Federal Advisory Committee Act of 1972, which "requires balance on such advisory bodies" [23]

"There is a growing sense that scientific research—which, after all, is defined by the quest for truth—is being manipulated for political ends", wrote Blackburn. "There is evidence that such manipulation is being achieved through the stacking of the membership of advisory bodies and through the delay and misrepresentation of their reports." [25] [26]

Blackburn serves on the Science Advisory Board of the Regenerative Medicine Foundation formerly known as the Genetics Policy Institute. [27]

Current research

In recent years Blackburn and her colleagues have been investigating the effect of stress on telomerase and telomeres [28] with particular emphasis on mindfulness meditation. [29] [30] She is also one of several biologists (and one of two Nobel Prize laureates) in the 1995 science documentary Death by Design/The Life and Times of Life and Times . She also featured in the 2012 Emmy award-winning science documentary, 'Decoding Immortality' (also known as 'Immortal') by Genepool Productions. [31] Studies suggest that chronic psychological stress may accelerate ageing at the cellular level. Intimate partner violence was found to shorten telomere length in formerly abused women versus never abused women, possibly causing poorer overall health and greater morbidity in abused women. [32]

At the University of California San Francisco, Blackburn currently researches telomeres and telomerase in many organisms, from yeast to human cells. [20] The lab is focused on telomere maintenance, and how this has an impact on cellular aging. Many chronic diseases have been associated with the improper maintenance of these telomeres, thereby affecting cellular division, cycling, and impaired growth. At the cutting edge of telomere research, the Blackburn lab currently investigates the impact of limited maintenance of telomeres in cells through altering the enzyme telomerase. [20]

Publications

Blackburn's first book The Telomere Effect: A Revolutionary Approach to Living Younger, Healthier, Longer [33] (2017) was co-authored with health psychologist Dr. Elissa S. Epel of Aging, Metabolism, and Emotions (AME) Center at the UCSF Center for Health and Community. [34] Blackburn comments on ageing reversal and care for one's telomeres through lifestyle: managing chronic stress, exercising, eating better and getting enough sleep; telomere testing, plus cautions and advice. [35] While studying telomeres and the replenishing enzyme, telomerase, Blackburn discovered a vital role played by these protective caps that revolved around one central idea: ageing of cells. The book hones in on many of the effects that poor health can have on telomeres and telomerase activity. [36] Since telomeres shorten with every division of a cell, replenishing these caps is essential to long term cell growth. Through research and data, Blackburn explained that people that lead stressful lives exhibit less telomerase functioning in the body, which leads to a decrease in the dividing capabilities of the cell. [36] Once telomeres shorten drastically, the cells can no longer divide, meaning the tissues they replenish with every division would therefore die out, highlighting the ageing mechanism in humans. To increase telomerase activity in people with stress-filled lives, Blackburn suggests moderate exercise, even 15 minutes a day, which has been proven to stimulate telomerase activity and replenish the telomere. [36]

Blackburn states that unhappiness in lives also has an effect on the shortening of telomeres. In a study done on divorced couples, their telomere length was "significantly shorter" compared to couples in healthy relationships, and Blackburn states, "There's an obvious stressor ... we are intensely social beings." [37] She suggests positivity in daily life increases health. While increasing the amount of exercise, decreasing stress, and tobacco use, and maintaining a balanced sleep schedule, Blackburn explains that telomere length can be maintained, leading to a decrease in cell aging. [37] Blackburn also tells readers to be wary of clinical pills that proclaim to lengthen or telomeres and protect the body from aging. She says that these pills and creams have no scientific proof of being anti-aging supplements and that the key to preserving our telomeres and stimulating telomerase activity comes from leading a healthy life. [37]

Personal life

While working at the MRC Laboratory of Molecular Biology in Cambridge, Blackburn met her husband John Sedat. [38] Sedat had taken a position at Yale, where she then decided to finish her postdoctoral. [5] [6] "Thus it was that love brought me to a most fortunate and influential choice: Joe Gall’s lab at Yale." They moved to New Haven and were married soon after. [6]

Blackburn splits her time living between La Jolla and San Francisco with her husband, and has a son, Benjamin, born in 1986. [6] [39] She serves as a mentor and advocate for scientific research and policy. [40]

Awards and honours

Blackburn's awards and honors include:

Elizabeth Blackburn (Nobel Prize in Medicine or Physiology 2009) in Stockholm, June 2016 Elizabeth Blackburn (Nobel Medicine or Physiology 2009) in Stockholm, June 2016.jpg
Elizabeth Blackburn (Nobel Prize in Medicine or Physiology 2009) in Stockholm, June 2016

Blackburn was elected:

In 2007, Blackburn was listed among Time magazine's 100 people who shape our world. [59]

Related Research Articles

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<span class="mw-page-title-main">Telomere</span> Region of repetitive nucleotide sequences on chromosomes

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<span class="mw-page-title-main">Telomerase</span> Telomere-restoring protein active in the most rapidly dividing cells

Telomerase, also called terminal transferase, is a ribonucleoprotein that adds a species-dependent telomere repeat sequence to the 3' end of telomeres. A telomere is a region of repetitive sequences at each end of the chromosomes of most eukaryotes. Telomeres protect the end of the chromosome from DNA damage or from fusion with neighbouring chromosomes. The fruit fly Drosophila melanogaster lacks telomerase, but instead uses retrotransposons to maintain telomeres.

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<span class="mw-page-title-main">Relationship between telomeres and longevity</span>

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References

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  4. ↑ Brady, Catherine (2007). Elizabeth Blackburn and the Story of Telomeres . Cambridge, Massachusetts: The MIT Press. ISBN   978-0-262-02622-2.
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  14. ↑ Madhusoodanan, Jyoti (18 November 2015). "Nobel Laureate Elizabeth Blackburn Named President of Salk Institute" . Retrieved 11 June 2018.
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  22. ↑ Blackburn, Elizabeth & Rowley, Janet (2004). "Reason as Our Guide". PLOS Biology . 2 (4): e116. doi: 10.1371/journal.pbio.0020116 . PMC   359389 . PMID   15024408.
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  26. ↑ A Nobel prize for a Bush critic Archived 12 May 2009 at the Wayback Machine By Andrew Leonard, Salon.com, 5 October 2009 Free text. Extensive quotation from Blackburn's article. She is an important scientist throughout the world.
  27. ↑ "Science Advisory Board". genpol.org. Regenerative Medicine Foundation. 2018. Archived from the original on 12 June 2018. Retrieved 11 June 2018.
  28. ↑ Epel ES, Lin J, Dhabhar FS, Wolkowitz OM, Puterman E, Karan L, Blackburn EH (2010). "Dynamics of telomerase activity in response to acute psychological stress". Brain, Behavior, and Immunity. 24 (4): 531–539. doi:10.1016/j.bbi.2009.11.018. PMC   2856774 . PMID   20018236.
  29. ↑ Jacobs TL, Epel ES, Lin J, Blackburn EH, Wolkowitz OM, Bridwell DA, Zanesco AP, Aichele SR, Sahdra BK, Maclean KA, King BG, Shaver PR, Rosenberg EL, Ferrer E, Wallace BA, Saron CD (2010). "Intensive meditation training, immune cell telomerase activity, and psychological mediators". Psychoneuroendocrinology. 36 (5): 664–681. doi:10.1016/j.psyneuen.2010.09.010. PMID   21035949. S2CID   4890811.
  30. ↑ Elissa Epel; Jennifer Daubenmier; Judith Tedlie Moskowitz; Susan Folkman; Elizabeth Blackburn (2009). "Can Meditation Slow Rate of Cellular Aging? Cognitive Stress, Mindfulness, and Telomeres". Annals of the New York Academy of Sciences . 1172 (1): 34–53. Bibcode:2009NYASA1172...34E. doi:10.1111/j.1749-6632.2009.04414.x. PMC   3057175 . PMID   19735238.
  31. ↑ "Immortal".
  32. ↑ Janice Humphreys; Elissa S. Epel; Bruce A. Cooper; Jue Lin; Elizabeth H. Blackburn; Kathryn A. Lee (2012). "Telomere Shortening in Formerly Abused and Never Abused Women". Biological Research for Nursing . 14 (2): 115–123. doi:10.1177/1099800411398479. PMC   3207021 . PMID   21385798.
  33. ↑ Blackburn, Elizabeth (2017). The telomere effect: a revolutionary approach to living younger, healthier, longer. New York: Grand Central Publishing. ISBN   978-1-4555-8798-8. OCLC   949143786.
  34. ↑ Dr. Elizabeth Blackburn, Dr. Elissa Epel (2017). The Telomere Effect: A Revolutionary Approach to Living Younger, Healthier, Longer. Grand Central Publishing. p. 416. ISBN   978-1-4555-8797-1.
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  54. ↑ "American Institute of Chemists Gold Medal". Science History Institute. 22 March 2018.
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  56. ↑ "Professor Elizabeth Helen Blackburn - Jesus College" . Retrieved 14 January 2024.
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  59. ↑ Alice Park (3 May 2007). "The Time 100: Elizabeth Blackburn". Time . Archived from the original on 5 May 2007. Retrieved 30 May 2008.
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