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News from AACR; In Memoriam: Nobel Leaureate David Baltimore, Ph.D.

Stephen J. Williams, Ph.D.: Reporter

Source: From AACR  Source: https://www.aacr.org/professionals/membership/in-memoriam/david-baltimore/ 

David Baltimore
In Memoriam: David Baltimore
(03/07/1938 – 09/06/2025)Member since 2013

David Baltimore, PhD, FAACR, a Fellow of the AACR Academy and a towering figure in modern biology whose insights reshaped cancer research and biomedical science, died on September 6, 2025, at the age of 87.

Baltimore’s career was defined by transformative discoveries. In 1975, he was awarded the Nobel Prize in Physiology or Medicine, alongside Renato Dulbecco and Howard Temin, for elucidating how tumor viruses interact with the genetic material of the cell. His discovery of reverse transcriptase overturned one of the central dogmas of molecular biology by showing that genetic information could flow from RNA back to DNA. This single revelation opened countless new frontiers in virology, immunology, oncology, and genetics, laying the foundation for decades of scientific advances influencing the fundamental understanding of retroviruses such as HIV, and driving the development of modern gene therapies and mRNA-based technologies.

Following his groundbreaking work in virology, Baltimore expanded his focus to the immune system, pioneering research on how mammalian immunity can be harnessed to combat cancer. His quintessential vision and curiosity fueled entire fields of inquiry, and his scholarship bridged basic science with clinical potential.

Born in New York City in 1938, Baltimore earned his undergraduate degree from Swarthmore College and a doctorate from Rockefeller University in 1964. His early independent research at the Massachusetts Institute of Technology (MIT) and the Salk Institute quickly established him as one of the most original scientific thinkers of his generation. At just 30 years old, he became an associate professor at MIT, where he would spend much of his career shaping both science and the careers of a plethora of researchers who would subsequently establish themselves as leaders in the global cancer research community.

Baltimore served in distinguished leadership roles throughout his storied career, including as president of Rockefeller University and later of the California Institute of Technology (Caltech), where he guided the institution through a decade of growth and scientific excellence. At Caltech, he held the Robert Andrews Millikan Professorship of Biology, and later the Judge Shirley Hufstedler Professorship of Biology, titles that underscored his standing as both a scientist and mentor with an enduring legacy.

Beyond the laboratory and university walls, Baltimore’s voice carried weight in national and international science policy forums. He was a leading advocate for federal investment in AIDS research, co-chaired the National Academy of Sciences Committee on a National Strategy for AIDS in 1986, and led the NIH AIDS Vaccine Research Committee a decade later. He also played an active role in shaping consensus guidelines on genetic engineering, thereby ensuring that scientific innovation proceeded with ethical responsibility.

Throughout his lifetime, Baltimore received innumerable honors, including election to the National Academy of Sciences, the Institute of Medicine, and the American Academy of Arts and Sciences. He was recognized with the National Medal of Science, the AMA Scientific Achievement Award, and the Lasker-Koshland Special Achievement Award in Medical Science. He also served as president of the American Association for the Advancement of Science and was elected to the inaugural class of Fellows of the AACR Academy in 2013.

Perhaps as significant as his discoveries, was Baltimore’s role as a mentor. He trained and inspired generations of scientists who themselves went on to make landmark contributions in cancer biology, immunology, and virology. Many of his mentees later achieved the highest levels of recognition in the field, including election as Fellows of the AACR Academy. His intellectual generosity and willingness to champion young investigators created a legacy of discovery that continues to reverberate to this day and will help to advance future researchers in the years to come.

David Baltimore’s life was one of restless inquiry, bold imagination, and unwavering dedication to science. His revolutionary discoveries continue to transform cancer medicine and deepen our understanding of life itself. The cancer research community—and indeed, all of biomedical science—mourns the loss of one of its most visionary and impactful leaders.

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Coronavirus mutation-does it matter?

Reporter : Irina Robu, PhD

Soon after SARS-CoV-2 was detected in China, scientists began analyzing viral sample and posting the genetic codes online. Mutations allowed researchers to track the spread by linking closely related viruses to understand how SARS-CoV-2 infects humans.  They recognized that SARS-CoV-2 encode their genome in RNA and tends to pick up mutations quickly as they are copied inside their hosts.  Yet,  sequencing data suggest that coronaviruses change more slowly than most RNA viruses, probably because of a proofreading enzyme that corrects fatal copying mutations.  In spite of the virus slow mutation rate, scientists have been able to classified more than 12,000 mutations in SARS-CoV-2 genomes.

Many scientists such as David Montefiori, a virologist who spent much of his career studying how chance mutations in HIV helps it evade the immune system thought that COVID-19 might cause the same thing.  His laboratory in collaboration with Dr. Bette Korber investigated several thousands of coronavirus sequences for mutations that might have changed virus properties around the world.

Compared to HIV, SARS-CoV-2 seems to be changing slower than it spreads, but one mutation is obvious. That mutation  includes a gene encoding the spike protein, which helps the virus particles penetrate cells. According to Korber, the 614th amino acid position of the spike protein, the amino acid aspartate was replaced by glycine, because of a mutation, D614G that altered a single nucleotide in the virus’s 29,903-letter RNA code.

To observe whether D614G  mutation made the virus more transmissible, Montefiori evaluated its effects under laboratory conditions but he couldn’t study the natural SARS-CoV-2 virus in his lab, because of the biosafety containment required. So, he studied a genetically modified form of HIV that used the SARS-CoV-2 spike protein to infect cells. Such ‘pseudo virus’ particles are a workhorse of virology labs: they enable the safe study of deadly pathogens such as the Ebola virus, and they make it simpler to test the effects of mutations.

The strongest sign that D614G has a consequence on the spread of SARS-CoV-2 in humans comes from an ambitious UK effort called the COVID-19 Genomics UK Consortium, which has analyzed genomes of around 25,000 viral samples. From these data, researchers have identified more than 1,300 instances in which a virus entered the United Kingdom and spread, including examples of D- and G-type viruses.

What is clearly known is that D614G is an adaptation that helps the virus infect cells or compete with viruses that don’t carry the change, while at the same time altering a bit of information about how SARS-CoV-2 spreads between people and through a population.  Some scientists believe that D614G mutation should explain how SARS-CoV-2 fuses with cells and can use that process to develop a more efficient vaccine. 

At the present time, the evidence suggests that D614G doesn’t stop the immune system’s neutralizing antibodies from recognizing SARS-CoV-2, partly because the mutation is not in the spike protein’s receptor-binding domain.

SOURCE

https://www.nature.com/articles/d41586-020-02544-6?utm_source=Nature+Briefing

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Heroes in Medical Research: Dr. Robert Ting, Ph.D. and Retrovirus in AIDS and Cancer

Curator and Reporter: Stephen J. Williams, PhD

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WordCloud Image Produced by Adam Tubman

This is the second posting in this series in which I highlight the basic research which led to seminal breakthroughs in the medical field, brought on by the result of basic inquiry, thorough and detailed investigation, meticulously following the scientific method, and eventually leading to development of important medical therapies.

In his autobiography, Virus Hunting: AIDS, Cancer & the Human Retrovirus: A Story of Scientific Discovery, Dr. Robert Gallo, M.D. describes a wonderful story of the history behind, scientific biographies, and chronology of the discoveries which led he and his colleagues (including co-discoverer Dr. Luke Montagnier) to recognize retroviruses (in particular HIV) as the leading culprit for the cause of AIDS and in the etiology of Kaposi’s sarcoma.   For anyone who appreciates the history behind scientific discoveries and appreciates learning about the multitude of individual efforts which are the crux of seminal research, this book is a must read.

Recommendations from the back cover include:

Virus Hunting will be read and reread, for years to come.” —New York Newsday

“Provides a human, revealing look into the arcane, usually secret confines of laboratory science.”

Martin Delany, Project Inform

..as well as others.

While a fascinating aspect of this book is the description, like fitting pieces of a puzzle, of the important discoveries throughout history which are the necessary foundations for further investigations and discoveries, more important is a telling, personal narrative of the people involved in those initial and subsequent discoveries.  In fact, the book has over 396 colleagues, mentors, technicians, students, and even critiques who are given credit, in one form or another, for the ultimate discovery of HIV as a causative agent for the development of AIDS. The book is a literal Who’s Who in Science and shows how important personal collaboration and friendships are in the process of scientific discovery.

In 1972, Dr. Seymour Perry had appointed the young Dr. Robert Gallo as head of a new department, the Human Tumor Cell Biology Branch, renamed the Laboratory of Tumor Cell Biology.  The lab was carrying on the work on tRNA that Dr. Gallo had performed in Dr. Sid Perska’s group at NIH.  However, with the help of new lab members Dr. David Gillespie, Dr. Flossie Wong-Staal, and Dr. Marjorie Robert-Guroff the lab focused on the search for disease-causing retroviruses, especially in human leukemias.  This was, in part, due to conversations with Dr. Robert Huebner and Todaro, who insisted that

“within the genetic makeup of this endogenous retroviral material was, they suggested, a special gene, the oncogene, that was the parent of the cancer-causing protein”

which may explain some of the early work by Rous concerning the Rous sarcoma virus.

Enter in Gallo’s good friend Dr. Bob Ting.  Dr. Gallo had known Dr. Ting socially since 1966, shortly after Gallo had arrived at NIH.  Dr. Bob Ting was a well-established NCI investigator, who was doing work on DNA and RNA oncogenic viruses of animals.  Originally from a large and wealthy family in Hong Kong, Dr. Ting had worked with Nobel Prize winners Salvatore Luria (who worked on phages) and Renato Dulbecco, who, along with his well-known cell culture media, had made the seminal discoveries that led to our knowledge how some DNA viruses can transform normal animal cells into neoplastic-like cells in culture.

Bob Ting gave a talk on these oncogenic viruses and Gallo was very interested in his observations that oncogenic viruses like Rous and Maloney, could transform cells in vitro in a matter of days.

A friendship developed between the two over tennis matches and Chinese food.  During this time, Dr. Ting made the important suggestion that they both collaborate and use the viral systems developed by Dulbecco.  Ting also introduced him to RNA viruses, Dr. Robert Huebner, and Dr. Howard Temin.  It was, in part, due to these associations that Gallo started looking, in earnest, at the possibility of RNA retroviruses in leukemias. Thus, just like the internet today, connections and networking provided new insights into current research, and helped lead the advent of new discoveries, therapies, and scientific disciplines.

Therefore, “after some late-night discussion with Bob Ting, I decided to enter the fray. My own laboratory, … would immediately be set up to compare the properties of reverse transcriptase enzymes from many different animal retroviruses”.

Although the rest is more history, this early friendship, collaboration, and mentoring by Bob Ting had “transformed” Gallo’s research efforts to set him up to make some of the important discoveries eventually leading to the discovery of the role of HIV in AIDS.

A video interviewing Dr. Gallo can be found here:

VIEW VIDEO

https://www.youtube.com/watch?v=ELRlXLGWu4I

A very nice writeup/obituary for Dr. Ting was written by Patricia Sullivan of the Washington Post and is included below.

Robert Ting, 77; Biotech Pioneer

ME/Ting-ob

Dr. Robert Ting’s biotech company in Rockville developed the first FDA-approved diagnostic test kits to test for HIV antibodies. (By Gerald Martineau — The Washington Post)

By Patricia Sullivan

Washington Post Staff Writer
Friday, September 22, 2006

Robert C.Y. Ting, 77, a research scientist who started one of the early biotechnology companies in the Washington area, died Sept. 11 of complications after cardiac surgery at the Cleveland Clinic in Cleveland.

Dr. Ting founded Biotech Research Laboratories Inc. in Rockville in 1973, producing cells for government scientists to use in research. Eleven years later, his firm obtained a federal license to develop and produce the first FDA-approved diagnostic test kits for HIV antibody confirmation.

Robert C. Gallo, who co-discovered the HIV virus as the cause of AIDS, called Dr. Ting a pioneer in the field who popularized the term “biotechnology” when he moved from research to entrepreneurship.

“He introduced me to virology, and he did it twice,” said Gallo, director of the Institute of Human Virology in Baltimore. The men had known each other since the 1960s, and while playing tennis one day, Dr. Ting advised the cancer researcher to look at new research in viruses. Later, when Gallo was studying leukemia, Dr. Ting directed him to animal research in leukemia. “First he showed me how viruses change cells. Then he introduced me to retrovirology. . . . I went into retrovirology solely because of those discussions with Bob Ting on tennis courts,” Gallo said.

Dr. Ting, whom Gallo described as a quiet, modest man, was born in Shanghai, the son of a physician to Gen. Chiang Kai-Shek. His family fled the country during the Japanese invasion of China during World War II and moved to Hong Kong. Soon after, he moved to the United States, where he received a bachelor’s degree and in 1956 a master’s degree in genetics from Amherst College.

He received a doctoral degree in microbiology and biochemistry from the University of Illinois in 1960 under Salvador E. Luria, who later won the 1969 Nobel Prize in Medicine and Physiology. Dr. Ting spent the next two years on a postdoctoral fellowship at the California Institute of Technology, working with Renato Dulbecco, who later won the 1975 Nobel Prize in Medicine and Physiology. Their work focused on how viruses cause tumors.

“A lot of molecular biology developed from this,” Dr. Ting told The Washington Post in 1984 from his Rockville office, cluttered with scientific journals, awards and a large blackboard. “There was so much evidence in animal systems [that viruses cause tumors], that the next question was obvious — can you find the equivalent in humans.”

Dr. Ting joined the National Institutes of Health in 1962 as a visiting fellow and then a senior research scientist at the National Cancer Institute. From 1966 to 1968, he was an associate editor for the Journal of the National Cancer Institute.

In 1969, he joined Litton Bionetics Inc. in Rockville as director of experimental oncology, leading a project funded by the institute to search for viruses in human leukemia patients. He became scientific director of the cancer research branch the next year.

With academic, government and private business experience under his belt, Dr. Ting decided to go into business on his own and in 1973 started Biotech Research Laboratories in Rockville. It was a profitable supplier of research services and supplies until 1981, when it went public and produced the HIV diagnostic test kits. It became one of the most successful public biotech companies in the area in the mid-1980s.

The Economic Development Board of Singapore invited him to return to Asia to start a biotech company, which he did in 1985, forming Diagnostic Biotechnology Ltd. He also joined the Institute of Molecular and Cell Biology at the National University of Singapore, which Gallo called “the most prominent Asian academic biotechnology center.”

He returned to the United States in 1998 to join the board of Cell Works Inc. in Baltimore, and became chair and chief executive of a joint venture, Cell Works Asia Limited, in 2000.

Most recently, Dr. Ting was the founding president and chief executive of Profectus Biosciences Inc. of Baltimore, previously known as Maryland BioTherapeutics Inc.

Dr. Ting was past chairman of the F.F. Fraternity, one of the oldest Chinese fraternities in the United States. He was also a member of the Organization of Chinese Americans in the D.C. area since its inception in the early 1970s. He enjoyed tennis, golf, ballroom dancing and international travel. He also was a wine connoisseur.

Survivors include his wife of 44 years, Sylvia Han Ting of Potomac; three children, Anthony Ting of Shaker Heights, Ohio, Andrew Ting of Beverly, Mass., and Jennifer Chow of Potomac; seven sisters; and seven grandchildren.

An obituary written from his son Anthony can be found here:

https://www.amherst.edu/aboutamherst/magazine/in_memory/1953/robertting

Sources:

http://www.amazon.com/Virus-Hunting-Retrovirus-Scientific-Discovery/dp/0465098150

http://www.washingtonpost.com/wp-dyn/content/article/2006/09/21/AR2006092101936.html

Other articles/postings related to this topic and HIV on this site includes:

Heroes in Medical Research: Barnett Rosenberg and the Discovery of Cisplatin

History of medicine, science, and society: 200 Years of the New England Journal of Medicine

Why did Pauling Lose the “Race” to James Watson and Francis Crick? How Crick Describes his Discovery in a Letter to his Son

John Randall’s MRC Research Unit and Rosalind Franklin’s role at Kings College

Interview with the co-discoverer of the structure of DNA: Watson on The Double Helix and his changing view of Rosalind Franklin

Otto Warburg, A Giant of Modern Cellular Biology

Inspiration From Dr. Maureen Cronin’s Achievements in Applying Genomic Sequencing to Cancer Diagnostics

Nanotechnology and HIV/AIDS treatment

HIV vaccine: Caltech puts us One step further

Getting Better: Documentary Videos on Medical Progress — in Surgery, Leukemia, and HIV/AIDS.

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