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Lap-Chee Tsui — Geneticist Who Found the Cystic Fibrosis Gene, HKU's 14th Vice-Chancellor

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This is one of the biographical profiles in "The University of Hong Kong (HKU) Database", covering the University's 14th Vice-Chancellor and geneticist Lap-Chee Tsui. This library's 00–12 reference section (factual) records real names as they are, without credibility badges. For profiles of the University's founders and leadership cohort, see faculty-and-leaders.md; for the contested accounts of presidential governance, see ../13-governance-and-reform/presidents-and-power.md.


1. Early Life and Education: From "Couldn't Get into an Anglo-Chinese School" to a Pittsburgh PhD


2. 1989: How to "Read" an Invisible Gene

This is the summit of Tsui's scientific career, and the key to understanding him. To grasp the weight of this discovery, one must first take in what made it so hard.

The difficulty: an unknown defect, hunted blind. Cystic fibrosis is one of the most common fatal recessive genetic diseases among Western Caucasians, in which the lungs, pancreas and other organs become clogged with abnormally thick secretions. In the 1980s, all anyone knew was that it was genetic — nobody had the faintest idea which gene or which protein was at fault. There was no known defective protein from which one could work backwards to the gene. Tsui and his collaborators took a path that was then brand new: positional cloning — that is, without presupposing the disease molecule, using genetic linkage alone to box in the gene's location on the chromosome step by step. This is widely recognised as the first human disease gene identified purely through linkage analysis and positional cloning.

Step one (1985): Pin the disease to chromosome 7. By 1985, Tsui's team had linked the disease gene to DNA markers on chromosome 7 — but that was still a broad region containing several million base pairs. It was like knowing the suspect was in a certain city and still having to go door to door.

Step two: Chromosome walking and jumping. Tsui (at the Hospital for Sick Children) collaborated with Francis Collins (then at the University of Michigan, later director of the US National Institutes of Health and leader of the Human Genome Project), combining chromosome walking with the chromosome jumping technique Collins had developed to close in on the target region of chromosome 7, layer by layer. The methodological paper, "Identification of the Cystic Fibrosis Gene: Chromosome Walking and Jumping," was published in Science in 1989.

What exactly do "walking" and "jumping" do? The terms sound abstract, but unpacked they are not hard to grasp. Chromosome walking starts from a known DNA marker and extends, clone by overlapping clone, toward the target region — like crossing a stream stone by stone. It is steady but slow, and it stalls when it hits regions that resist cloning. Chromosome jumping is Collins's "fast-forward": using a specially constructed circularisation library, analysis can "jump" straight over stretches of hundreds of thousands of base pairs from one site to a landing point further on, before returning to walk in fine detail. Together, the two techniques let the team efficiently home in on CFTR within the vast expanse of chromosome 7. This approach — "don't worry about what the gene product is; just nail it by position" — was then known as reverse genetics, the mirror image of the traditional "know the protein first, then find the gene" route. CFTR was one of the earliest and most persuasive trophies of this new paradigm.

Step three (1989): Pinpoint the gene and the most common mutation. The paper was accepted in mid-August 1989, and on 8 September three consecutive papers appeared in a single issue of Science, announcing the identification of the CFTR geneCFTR, the "cystic fibrosis transmembrane conductance regulator," a chloride channel protein. The team also found that about 70% of patients carry the same three-base deletion, the ΔF508 mutation (loss of phenylalanine at position 508). This body of work brought Tsui international fame.

It was not his work alone. The core team also included John R. (Jack) Riordan, Johanna Rommens and Manuel Buchwald at the Hospital for Sick Children, and Francis Collins at the University of Michigan. This profile follows the sources in recording Tsui's leadership role; the full authorship as it appears on the papers is a matter for the original literature.

What made it hard was also the "grind." Positional cloning was a race against time and rivals. Tsui has recalled how a competitor "announced" at an academic conference that they had found the gene, leaving him in the audience "sweating with fright" at the thought that years of work were about to be scooped; the rival's result later turned out to be wrong. Harder still, he had to persuade his own collaborators that "the other team had not found the disease gene" and to keep going together. HKU's honorary degree citation sums up the fineness of the work in one vivid number: in patients, out of roughly 250,000 base pairs, precisely 3 are missing — and it is precisely those 3 missing bases that cause the disease. The citation calls it "a major breakthrough in human genetics" and says it "greatly advanced the treatment strategies" for the disease.

Milestone Year Key content
Linkage mapping 1985 CF disease gene linked to DNA markers on chromosome 7
Methodology 1989 Chromosome walking + jumping close in on target region (Science)
Gene identification 1989-09-08 Three Science papers published together, confirming the CFTR gene
Most common mutation 1989 ΔF508 three-base deletion, found in ~70% of patients

A carefully choreographed simultaneous announcement. At the time, the discovery was a global science story. The Howard Hughes Medical Institute and the US Cystic Fibrosis Foundation coordinated simultaneous press conferences in Toronto and Washington to amplify the coverage; the linkage map from the three Science papers graced that issue's cover. One much-told anecdote: Johanna Rommens, a lead author, was hiking in the Rocky Mountains at the time and had to be tracked down by the Royal Canadian Mounted Police (RCMP) to attend the press conference — a measure of the uproar. University of Toronto geneticist Ronald Worton later called it "the greatest achievement" among the hospital's series of disease-gene discoveries. The team's division of labour played to each member's strengths: Batsheva Kerem led the genetic mapping, while Jack Riordan identified the expressed gene using a sweat-gland cDNA library. According to the HKU citation, Tsui has published over 300 papers and served on the editorial boards of twenty international journals; CFTR is merely the most brilliant of them.

Why this work is repeatedly described as "rule-changing." Before CFTR, finding a disease gene when all one knew was "it's inherited, but we don't know what's wrong" was almost hopeless; this case proved that "you can pull out a gene on chromosome position alone" was feasible. Michigan Medicine's retrospective put it bluntly: the discovery "changed cystic fibrosis care and genetic research forever". Over the next two decades, the causal genes of Huntington's disease, Duchenne muscular dystrophy, polycystic kidney disease and a host of other single-gene disorders were conquered one after another along the same positional-cloning road — the path Tsui and his collaborators first blazed became the standard toolkit of an entire generation of geneticists.

Background note: Tsui's standing as a top geneticist rests on the CFTR discovery; this achievement predates his tenure as HKU Vice-Chancellor and was not carried out at HKU. This library records the institutional affiliation (Hospital for Sick Children / University of Toronto / University of Michigan) as it actually was, so that readers do not mistake it for "HKU research output." His HKU connection lies in his later stewardship of the University and his push for research and internationalisation there.


3. After CFTR: How One Gene Rewrote the Fate of a Disease

First, how severe the disease was. To gauge the weight of the CFTR discovery, one must know what cystic fibrosis once was. Caused by defective CFTR chloride channels, it makes epithelial tissues of the lungs, pancreas, gut and bile ducts secrete abnormally thick mucus; classic manifestations include elevated chloride in sweat, recurrent bacterial infections and bronchiectatic lung disease, and pancreatic insufficiency. In the 1950s, patients' life expectancy was around 5 years; before the 1980s, roughly half of patients did not survive into their twenties. This was a disease that killed children — and it was against that backdrop that Tsui's work unfolded.

Finding the gene was only the beginning. The identification of CFTR set off three long-term reverberations for cystic fibrosis, worth a section of their own.

One gene, more than two thousand ways to break. ΔF508 is only the commonest. Over three decades, researchers have found more than two thousand mutation sites in CFTR, each disrupting the chloride channel differently — some misfold the protein (like ΔF508), some impair the channel's opening and closing, some prevent the protein from being made at all. That is precisely why CFTR-modulator drugs must be developed mutation-type by mutation-type: the "lock" identified in 1989 turned out to have more than two thousand "wrong keys," each needing a bespoke countermeasure. As to scale, cystic fibrosis affects some 70,000 patients worldwide, the majority of European or Caucasian descent — the target Tsui chose back then happens to be one extremely common in the West but rare in East Asia, which is why the Chinese-speaking world has long underestimated the scientific weight of his achievement.

The therapeutic progress in this section belongs to the later development of the CFTR field, not to Tsui's personal output; it is recounted here to show the long-term significance of his 1989 finding, and to keep readers from undervaluing what "one gene mapped" was worth. Cystic fibrosis is far rarer in East Asian populations than in the West — which is precisely why the disease is little known in the Chinese-speaking world even as the CFTR discovery carries enormous scientific weight.


4. 2002–2014: HKU's 14th Vice-Chancellor

Verifiable milestones of his tenure:

Controversial governance events during his tenure (with all parties' accounts set side by side, unadjudicated) fall under the wild-history section and are not developed here; the relevant files are in ../13-governance-and-reform/. This profile records his life, scientific contributions, and verifiable facts of office.


5. After the Vice-Chancellorship: Founding the Academy of Sciences of Hong Kong, Then Summoned to Plan a New Medical School

Tsui did not retire after leaving HKU; he moved into a "post-presidency" phase holding several posts at once.

From "reading" a gene in 1989 to helping select a city's third medical school in 2025, Tsui's role has shuttled ceaselessly between "science" and "institutions": the first half of his life used laboratory methods to solve a specific scientific problem; the second half used the same disposition — "let evidence and standards speak" — to wrestle with the messier public questions of university governance, research policy and medical education.


6. A Creed for Research and Governance: "Interest First" and "Let Evidence Speak"

What ties together Tsui's research, his university stewardship and his late-career public service is a remarkably consistent set of convictions. This section is drawn from his public interviews and inaugural remarks, all traceable to his own words.

These statements are the mirror image of the methodology behind his positional cloning of CFTR — "don't pre-suppose the answer; let the evidence close in step by step." Whether in the laboratory, the Vice-Chancellor's office or a government working group, he leans on the same approach: "let evidence and standards speak."


7. The Dual Identity: Why This Library Records Science and Governance Separately

Tsui's case reflects a "dual identity" phenomenon worth attention. In today's research universities, a top scientist becoming Vice-Chancellor is hardly rare — but someone who, like him, first built his reputation on a specific, discipline-rewriting scientific discovery and only then took the helm of a centenarian institution is still unusual. This trajectory breeds a peculiar tension: a scientist used to "letting evidence speak" in the laboratory suddenly faces, in the Vice-Chancellor's chair, the altogether different logics of governance, fundraising, political pressure and public relations. This library's treatment is precisely to keep the two identities separate — the scientific discovery (CFTR) belongs to science, and its excellence is recorded as fact; the governance belongs to governance, and its controversies are placed in the wild-history section, with accounts set side by side and unadjudicated. In this way we neither use his scientific achievements to sidestep governance controversies nor use those controversies to erase his scientific contributions. A person may be an uncontested giant in one domain and enter a field of contested evaluation in another — keeping the two apart is precisely the point of this library's convention of "real names in the factual section, contested accounts set side by side in the wild-history section." Among HKU's successive Vice-Chancellors, Rayson Huang was a chemist, Wang Gungwu a historian, Cheng Yiu-chung a microelectronics engineer and Peter Mathieson a nephrologist — "the scholar as administrator" has been the norm at HKU, and how each man's scholarly background and governance style illuminate each other can be read across in faculty-and-leaders.md.


8. Honours

According to his Wikipedia biography, the geneticist Wikipedia entry and the Canadian Medical Hall of Fame page, Tsui holds international science prizes, honours from multiple jurisdictions and fellowships of multiple academies. His honours fall into three bundles: top-tier science prizes recognising the CFTR work, national/regional honours conferred by Canada, France and Hong Kong, and academy fellowships and hall-of-fame inductions from several countries. According to his official HKU CV, he also holds honorary doctorates from fourteen leading universities worldwide — a measure of the transnational reach of his scholarly reputation:

Category Honour Year
International science prize Gairdner International Award (Canada) 1990
International science prize Elliott Cresson Medal; Killam Prize (Canada)
Canadian honour Officer of the Order of Canada 1991
Canadian honour Order of Ontario
French honour Knight of the Legion of Honour 2007
Hong Kong honour Justice of the Peace (JP) 2006
Hong Kong honour Gold Bauhinia Star (GBS) 2011
Hong Kong honour Grand Bauhinia Medal (GBM)
Honorary doctorate Honorary doctorates from fourteen leading universities worldwide
Hall of fame Inducted into the Canadian Medical Hall of Fame (the only ethnic Chinese inductee) 2012
Fellowship Fellow of the Royal Society (FRS); Fellow of the Royal Society of Canada (FRSC)
Fellowship Foreign Member of the US National Academy of Sciences; Foreign Member of the Chinese Academy of Sciences; Academician of Academia Sinica (Taiwan)

The exact years of the Hong Kong and mainland honours and of the various academy fellowships follow the official registers; this table lists years where verified and leaves "—" where not, without speculation. For the cross-referencing of top-tier fellowship honours with other HKU academicians, see nobel-and-awards.md.


Appendix: Chronology

The table below consolidates the sources of this profile, arranging Tsui's key milestones in chronological order for quick reference. Individual dates follow the official registers; see the corresponding sections above.

Year Event
1950 Born 21 December in Shanghai; ancestral home Hangzhou, Zhejiang; moved south to Hong Kong as a child
1967 Form 5 at Ho Man Tin Government Secondary School; A grades in English and Biology
1972 BSc in Biology, New Asia College, The Chinese University of Hong Kong (third-class honours)
1974 MPhil in Biology, The Chinese University of Hong Kong
1979 PhD in Biology, University of Pittsburgh, USA
1981 Joined the Genetics Department, Hospital for Sick Children, Toronto
1985 CF disease gene linked to chromosome 7
1989 8 September: three Science papers confirm the CFTR gene and the ΔF508 mutation
1990 Gairdner International Award (Canada)
1991 Officer of the Order of Canada
2000–2002 President of the Human Genome Organisation (HUGO)
2002 Assumed office 1 September as HKU's 14th Vice-Chancellor and President
2003 HKU Medical Faculty team first to isolate the SARS coronavirus during the outbreak
2005 HKU Medical Faculty receives HK$1 billion donation from the Li Ka Shing Foundation and is renamed
2006 Appointed Justice of the Peace (JP) of the Hong Kong SAR
2011 HKU centenary; awarded the Gold Bauhinia Star (GBS)
2012 Centennial Campus opens; inducted into the Canadian Medical Hall of Fame
2014 Stepped down as HKU Vice-Chancellor on 31 March
2015 Became Director of the Qiushi Academy for Advanced Studies, Zhejiang University; in December, Founding President of the Academy of Sciences of Hong Kong
2017 Chairman of the research policy task force
2025 February: appointed expert adviser to the working group on the new medical school; November: Executive Council approves HKUST as organiser of the third medical school

Unverified / To Be Checked

  • Collaborating team and corresponding authorship of the CFTR discovery: this profile follows institutional histories and biographies in recording his leadership role and principal collaborators (Riordan, Rommens, Buchwald, Collins); the complete author list and corresponding authorship require checking the original literature (the 1989 Science series of three papers).
  • Exact years of some honours: Justice of the Peace per the official HKU CV is 2006, Gold Bauhinia Star 2011; the years of the Grand Bauhinia Medal, the Order of Ontario and the various academy fellowships need to be checked against the official registers one by one; this profile leaves them pending verification.
  • A detailed list of policy achievements during his presidency: the SCMP retrospective and local reporting provide an overview; itemised data (such as admissions, research funding and year-on-year international ranking movement) require checking HKU's annual reports — see ../03-rankings/ and ../08-finances/.


Sources · verify independently