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PETBioNewsReviewsEvent Review: Heart Genetics - Predicting the Future?

BioNews

Event Review: Heart Genetics - Predicting the Future?

Published 13 May 2013 posted in Reviews and appears in BioNews 704

Author

Simon Hazelwood-Smith

Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the output from a DNA sequencing machine.
CC BY 4.0
Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the sequencing output from an automated DNA sequencing machine.

I'd not been to a Cafe Scientifique event before and was a little unsure of what to expect. The Royal Brompton coffee shop setting did at first feel strange; I'm more used to discussions in lecture theatres where there is a clear distinction between audience and speaker...


Heart Genetics: Predicting the Future?

Organised by Imperial College London and Royal Brompton Hospital

Coffee Shop, Royal Brompton Hospital, Sydney Street, London SW3 6NP

Wednesday 8 May 2013

'Heart Genetics: Predicting the Future?', organised by Imperial College London and Royal Brompton Hospital, Wednesday 8 May 2013


I'd not been to a Cafe Scientifique event before and was a
little unsure of what to expect. The Royal Brompton coffee shop setting did at
first feel strange; I'm more used to discussions in lecture theatres where
there is a clear distinction between audience and speaker.

But the informal setting and refreshments created an open and
friendly atmosphere, which is clearly what Cafe Scientifique events are all
about. They aim to bring scientists, clinicians and the public together to chat
about important scientific topics without the barriers that are often present
elsewhere.

The subject on offer was heart disease and genetics, with
questions being answered by clinical geneticist Dr Tessa Homfray and Stuart
Cook
, professor of clinical and molecular cardiology at Imperial College
London.

Professor Cook kicked things off with an introduction that
focused on that hottest of genetic topics - next generation sequencing (NGS) technology.
He spoke of the revolution its development has had on genetic research.

He gave a particularly clear example of its power when
discussing a recent breakthrough. For some time, the gene TTN had been thought
to play a role in the heart condition dilated cardiomyopathy (DCM), but its
status as the largest gene in the human genome proved prohibitive to meaningful
examination with old technology. With the advent of NGS, Professor Cook's team
were able to fully screen the gene, finding mutations explaining 25 percent of
all DCM
. This has of course not gone unnoticed — a grant has recently been
awarded by the Wellcome Trust so that a test can be developed and brought to
clinic.

Dr Homfray's introduction was more patient-focused. She sought
to give answers and opinions on some of the most common questions patients ask
on the benefits and risks of genetic testing. She explained that genetic
testing can be a double-edged sword. In some cases a test can give vital
information on the best treatments and drugs to prescribe. However, in others
it may prevent a teenager from being permitted to play sports they enjoy for
fear of triggering a dangerous heart event. This is because not everyone who
inherits a mutation will necessarily develop disease, a phenomenon known as
reduced penetrance.

But there's also the reverse of that coin, Dr Homfray pointed
out; the value of negative test results should not be underestimated. In the
case of inherited heart conditions, a negative result has the potential to take
a huge weight off a patient's mind, allowing them a much freer lifestyle.

Many of the questions that followed were from patients and
relatives of patients considering the ethical implications of genetic research
and testing in conditions such as these. An emotive point was raised by a woman
with end-stage hypertrophic cardiomyopathy, who had given blood for research
purposes but had never received any feedback. She was also concerned that the
rate of discovery in this area had seemed to lag behind DCM research.

Professor Cook explained that it can take many years for results
from scientific studies to be published and that even then the path to any
treatment is rarely straight. Unfortunately, from a patient perspective,
progress may not seem to come fast enough.

Advances are being made, though. Professor Cook and his team are
working to produce large databases of patient DNA sequences paired with
detailed descriptions of their symptoms. These are being used to show
connections and differences between various types of heart conditions. It is
Professor Cook's aim to comprehensively describe the genetic underpinnings of cardiac
disease, and it is difficult not to be carried away by his enthusiasm.

Dr Homfray responded insightfully to questions relating to
sudden cardiac death and screening. She felt that while the sudden death of
anyone is a tragedy, routine screening of the population can bring unnecessary
fear and treatment. She went on to say even slightly abnormal results sometimes
lead to people having to give up active lifestyles. Given the reduced
penetrance of heart conditions, there was a suggestion that we may be being
over-cautious if testing without prior reason.

I found the event highly enlightening; many important questions
on genetic testing were brought up and intelligent, measured responses were
given by both speakers. Although I personally would have benefited from a bit
more of an introduction to heart disease and the distinction between the
different conditions, topics were generally discussed in layman's terms.

Overall it seems there is reason for optimism for those with and
at risk of heart conditions. As Professor Cook and Dr Homfray explained,
progress is being made in our understanding of genetic disease, and we can be
confident that this will ultimately lead to better treatment.

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