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astronomy

Gregg L. Semenza

Gregg L. Semenza is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Gregg L. Semenza rather than just read about it. In short: Gregg Leonard Semenza (born July 12, 1956) is an American pediatrician and Professor of Genetic Medicine at the Johns Hopkins School of Medicine. He serves as the director of the vascular program at the Institute for Cell Engineering.

Gregg L. Semenza — main illustration
Gregg L. Semenza — illustration

Key takeaways

  • Gregg L. Semenza belongs to astronomy; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Gregg L. Semenza to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Gregg L. Semenza from memory before moving on to harder problems.

Reference excerpt

Gregg Leonard Semenza (born July 12, 1956) is an American pediatrician and Professor of Genetic Medicine at the Johns Hopkins School of Medicine. He serves as the director of the vascular program at the Institute for Cell Engineering. He is a 2016 recipient of the Albert Lasker Award for Basic Medical Research. He is known for his discovery of HIF-1, which allows cancer cells to adapt to oxygen-poor environments. He shared the 2019 Nobel Prize in Physiology or Medicine for "discoveries of how cells sense and adapt to oxygen availability" with William Kaelin Jr. and Peter J. Ratcliffe. Semenza has had thirteen research papers retracted due to issues such as duplicated images and potential data manipulation.

Early life Semenza was born on July 12, 1956, in Flushing, New York City; he and his four siblings grew up in Westchester County, New York. His father's family was of Italian descent whereas his mother's family was of German-English-Irish descent.

Education and career Semenza grew up in Westchester County, New York and attended Washington Irving Intermediate School in Tarrytown, New York. He then attended Sleepy Hollow High School where he was a mid-fielder on the soccer team and graduated in 1974. As an undergraduate at Harvard University, he studied medical genetics and mapped genes on chromosome 21. For his MD-PhD at the University of Pennsylvania, he sequenced genes linked to the recessive genetic disorder, beta-thalassemia. Semenza subsequently completed his Pediatrics residency at Duke University before completing a postdoctoral fellowship at Johns Hopkins University. Semenza became the founding director of the Vascular Program at the Johns Hopkins Institute for Cell Engineering following his post-doctorate.

Research

While a post-doctorate researcher at Johns Hopkins, Semenza evaluated gene expression in transgenic animals to determine how this affected the production of erythropoietin (EPO), known to be part of the means for the body to react to hypoxia, or low oxygen levels in the blood. Semenza identified the gene sequences that expressed hypoxia-inducible factors (HIF) proteins. Semenza's work showed that the HIF proteins consisted of two parts; HIF-1β, a stable base to most conditions, and HIF-1α that deteriorated when nominal oxygen levels were present. HIF-1α was further found essential to the EPO production process, as test subjects modified to be deficient in HIF-1α were found to have malformed blood vessels and decreased EPO levels. These HIF proteins were found across multiple test animals. Semenza further found that HIF-1α overproduction could lead to cancer in other subjects. Semenza's research overlapped with that of William Kaelin and Peter J. Ratcliffe on determining the mechanism of oxygen detection in cells, and how EPO production is regulated by HIF and other factors. This has led to the development of drugs that help regulate these processes for patients with anaemia and kidney failure.

Retractions In 2011, Semenza retracted a Biochemical Journal paper that he had coauthored with Naoki Mori and others. In 2022, he retracted four papers from PNAS, according to Retraction Watch. As of 2022, concerns about the integrity of images in 52 articles coauthored by Semenza have been raised on PubPeer. This has led to investigations by the journals where these articles appeared, resulting in many corrections, retractions and expressions of concern. In 2023, additional papers in PNAS and Oncogene were retracted. As of 2024, Semenza has had 13 of his research papers retracted due to issues such as potential improper manipulation and/or duplication of images.

Personal life Semenza is married to Laura Kasch-Semenza, whom he had met while at Johns Hopkins, and who currently operates one of the university's genotyping facilities.

Awards 1989: Lucille P. Markey Scholar Award in Biomedical Science, Markey Trust 1995: Elected Member of the American Society for Clinical Investigation 2000: E. Mead Johnson Award for Research in Pediatrics, Society for Pediatric Research 2008: Elected Member of the National Academy of Sciences 2008: Elected Member of the Association of American Physicians 2010: Gairdner Foundation International Award 2012: Elected to the Institute of Medicine 2012: The Scientific Grand Prize of the Lefoulon-Delalande Foundation 2012: Stanley J. Korsmeyer Award, American Society for Clinical Investigation 2014: Wiley Prize 2016: Albert Lasker Award for Basic Medical Research (with William Kaelin and Peter J. Ratcliffe) 2019: Nobel Prize in Physiology or Medicine (with William Kaelin and Peter J. Ratcliffe), awarded by the Nobel Prize committee "for their discoveries of how cells sense and adapt to oxygen availability."

References

External links

Gregg L. Semenza on Nobelprize.org including the Nobel Lecture on 7 December 2019 Hypoxia-Inducible Factors in Physiology and Medicine

Illustrations

Gregg L. Semenza illustration
Gregg L. Semenza: Illustration of how cells sense and adapt to oxygen availability
Illustration of how cells sense and adapt to oxygen availability

Worked examples

Example 1 — a first encounter with Gregg L. Semenza

Start with the simplest possible case. Write down what Gregg L. Semenza claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Gregg L. Semenza before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Gregg L. Semenza ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Gregg L. Semenza

In research
Gregg L. Semenza appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Gregg L. Semenza in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Gregg L. Semenza is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1956 births, 20th-century American medical doctors, 20th-century American scientists, so understanding it makes those chapters shorter.
In everyday life
Look for Gregg L. Semenza outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Gregg L. Semenza in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Gregg L. Semenza means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Gregg L. Semenza out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gregg L. Semenza in simple terms?

Gregg Leonard Semenza (born July 12, 1956) is an American pediatrician and Professor of Genetic Medicine at the Johns Hopkins School of Medicine. He serves as the director of the vascular program at the Institute for Cell Engineering.

Why does Gregg L. Semenza matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Gregg L. Semenza?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Gregg L. Semenza.

Tags

  • 1956 births
  • 20th-century American medical doctors
  • 20th-century American scientists
  • 21st-century American medical doctors
  • 21st-century American scientists
  • American Nobel laureates
  • American medical researchers
  • Duke University alumni
  • Harvard University alumni
  • Johns Hopkins University faculty
  • Living people
  • Medical doctors from New York City

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