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Prestigious UK grant equips UFS academic to improve human health

21 June 2021 Photo Supplied

Dr Carmien Tolmie – Lecturer in the Department of Microbiology and Biochemistry at the University of the Free State (UFS) – is one of 30 postdoctoral research assistants in the United Kingdom and Africa who have benefited from the £3,7 M Global Challenges Research Fund (GCRF) START grant over the past three years. The grant was made available by the Science and Technology Facilities Council (STFC) in support of the Synchrotron Techniques for African Research and Technology (START) programme. The STFC is based in the United Kingdom.

The grant seeks to build partnerships between world-leading scientists in Africa and the UK who are working on research using synchrotron science. Forming part of this collaboration is the UK’s national synchrotron, Diamond Light Source (Diamond). The synchrotron, one of about 70 in the world, can be explained as a large machine, almost the size of a football field, which accelerates electrons to nearly the speed of light. According to Diamond, these fast-moving electrons produce very bright light, called synchrotron light. Scientists can use this light to study minute matter such as atoms and molecules.

Celebrating a new generation of scientists

On 7 June 2021, GCRF START celebrated its successes of the past years via a virtual event, including the new generation of scientists they trained. Diamond Light Source (Diamond) hosted the event.

In a statement issued by Diamond Light Source, Dr Tolmie was said to be one of the rising stars in the newly emerging Structural Biology network in South Africa. The statement reads that Dr Tolmie has made great strides with biocatalysis, investigating enzymes as drug targets for fungal infectious diseases that claim many lives, especially among immunocompromised patients.

Dr Tolmie claims that the workings of the natural world have always interested her, especially how it can be used to sustainably improve human health and agriculture. Observing some of the health challenges in Africa motivated her to take the opportunity to work with Prof Dirk Opperman, Associate Professor in the UFS Department of Microbiology and Biochemistry. Prof Opperman is a GCRF START co-investigator in the UFS Biocatalysis and Structural Biology research group, working on various bacterial and fungal enzymes.

Focusing on structural biology, Dr Tolmie is also working on drug discovery projects to find a sustainable solution through novel antifungal drugs.

To conduct the research that can improve the health of so many people suffering from infectious fungal diseases that can be serious, especially for immunocompromised patients living with HIV/Aids, recipients of organ transplants, patients undergoing chemotherapy and many more, Dr Tolmie will be using the drug discovery method of X-ray crystallographic fragment screening at Diamond Light Source (Diamond). “I was introduced to the concept and power of fragment screening techniques during GCRF START meetings,” says Dr Tolmie.

A research visit to Diamond Light Source in the UK in 2019, where she learned more about the experimental workflow of XChem and the i04-1 beamline, also inspired her to embark on XChem projects for antifungal drug discovery.

Exposed to cutting-edge scientific techniques

She attributes her recent appointment as lecturer to the mentoring and training she received through the GCRF START grant, which also funded a secondment to Diamond and the University of Oxford, exposing her to cutting-edge scientific techniques such as XChem fragment screening.

Prof Chris Nicklin, Science Group Leader and Principal Investigator in the GCRF START grant programme, says by providing the new generation of synchrotron users with access to world-class equipment and investing in their skills and capacity, research in the UK and Africa has been enriched and deepened.

“Being involved in the START grant has made a very concrete contribution to my career as a young scientist. GCRF START has also exposed me to many esteemed international scientists and facilities,” says Dr Tolmie.

Specifically alluding to the research that Dr Tolmie is working on, Dr Gwyndaf Evans, START Life Sciences Principal Investigator and principal beamline scientist on Diamond’s VMXm beamline, says: “It has been rewarding to see the relatively modest investment of time and money have such a major impact on the sustainability of research expertise, on the development of careers in Africa, on access to large-scale facilities around the world, and on the nurturing of collaborations and networks in South Africa.”

He continues: “In structural biology, there have been valuable exchanges and collaborations, especially XChem laying the foundations for drug discovery work. START is the beginning of embedding the structural research culture in South Africa and other groups around the world. We look forward to what the future holds.”

Dr Tolmie, who completed her BSc degree in Molecular Biology and Biotechnology at Stellenbosch University, completed her postgraduate studies (BSc Honours degree, MSc, and PhD) at the UFS.

News Archive

To tan or not to tan: a burning issue

2009-12-08

Prof. Werner Sinclair

“Some evidence exists which implies that sunscreens could indeed be responsible for the dramatic rise in the incidence of melanoma over the past three decades, the period during which the use of sunscreens became very popular,” says Prof. Werner Sinclair, Head of the Department of Dermatology at the University of the Free State. His inaugural lecture was on the topic Sunscreens – Curse or Blessing?

Prof. Sinclair says the use of sunscreen preparations is widely advocated as a measure to prevent acute sunburn, chronic sun damage and resultant premature skin aging as well as skin malignancies, including malignant melanoma. There is inconclusive evidence to prove that these preparations do indeed achieve all of these claims. The question is whether these preparations are doing more harm than good?

He says the incidence of skin cancer is rising dramatically and these tumours are induced mostly by the ultra-violet rays.

Of the UV light that reaches the earth 90-95% belongs to the UVA fraction. UVC is normally filtered out by the ozone layer. UVB leads to sunburn while UVA leads to pigmentation (tanning). Because frequent sunburn was often associated with skin cancer, UVB was assumed, naively, to be the culprit, he says.

Exposure to sunlight induces a sense of well-being, increases the libido, reduces appetite and induces the synthesis of large amounts of vitamin D, an essential nutritional factor. The use of sunscreen creams reduces vitamin D levels and low levels of vitamin D have been associated with breast and colon cancer. Prof. Sinclair says the 17% increase in breast cancer from 1981 to 1991 parallels the vigorous use of sunscreens over the same period.

Among the risk factors for the development of tumours are a family history, tendency to freckle, more than three episodes of severe sunburn during childhood, and the use of artificial UV light tanning booths. He says it remains a question whether to tan or not. It was earlier believed that the main carcinogenic rays were UVB and that UVA merely induced a tan. The increase in UVA exposure could have severe consequences.

Prof. Sinclair says the UV light used in artificial tanning booths consists mainly of pure UVA which are highly dangerous rays. It has been estimated that six per cent of all melanoma deaths in the UK can be directly attributed to the use of artificial tanning lights. The use of an artificial tanning booth will double the melanoma risk of a person. “UVA is solely responsible for solar skin aging and it is ironical that tanning addicts, who want to look beautiful, are inflicting accelerated ageing in the process,” he says.

On the use of sunscreens he says it can prevent painful sunburn, but UVA-induced damage continues unnoticed. UVB blockers decrease vitamin D synthesis, which is a particular problem in the elderly. It also prevents the sunburn warning and therefore increases the UVA dosage that an individual receives. It creates a false sense of security which is the biggest problem associated with sunscreens.

Evidence obtained from the state of Queensland in Australia, where the heaviest and longest use of sunscreens occurred, boasted the highest incidence of melanoma in the world. A huge study in Norway has shown a 350% increase in melanoma for men and 440% for women. This paralleled the increase in the use of UVB blocking sunscreens while there was no change in the ozone layer. It did however, occur during that time when tanning became fashionable in Norway and there was an increase especially in artificial tanning.

Prof. Sinclair says: “We believe that sunscreen use does not directly lead to melanoma, but UVA exposure does. The Melanoma Epidemic is a reality. Sunscreen preparations are not the magical answer in the fight against melanoma and the irresponsible use of these preparations can worsen the problem.”

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt.stg@ufs.ac.za
7 December 2009

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