th form open day - newcastle universitythe pulmonary circuit carries blood to the lungs to be...
TRANSCRIPT
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6th Form
Open Day
13th July 2016
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“DNA is like a computer program but far, far more
advanced than any software ever created.”
― Bill Gates
Welcome to the Open Day event at the Institute of Genetic Medicine (IGM). We are a bunch of
research and clinical scientists at Newcastle University and we are eager to share our
enthusiasm in science and in particular, genetics. We would like to take you on a journey
from the research bench, where we spend the majority of our time, to the patients’
bedside; and show you how the research done at the IGM can help develop future
therapies and improve the life of patients. We hope that participating in today’s workshop
will inspire you to pursue a career in biomedicine and show you how genetics can help in
understanding the diseases and their mechanisms.
Thank you for coming along today, we hope you enjoy it!
Public Engagement Team
Institute of Genetic Medicine
Newcastle University
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Agenda
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Heart development
Human cardiovascular system
The heart, blood vessels and blood itself are three essential components the body needs in order to survive. The human cardiovascular system is double circulatory, which means that it comprises two separate circuits and blood passes through the heart twice.
The pulmonary circuit carries blood to the lungs to be oxygenated and then back to the heart. In the lungs, carbon dioxide is removed from the blood, and oxygen is taken up by the haemoglobin in the red blood cells.
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The systemic circuit carries blood around the body to deliver the oxygen and returns de-oxygenated blood to the heart. Blood also carries nutrients and waste.
There are three types of blood vessels: Arteries that carry blood away from the heart (always oxygenated apart from the pulmonary artery which goes to the lungs) and contain blood under high pressure, Veins that carry blood to the heart (always de-oxygenated apart from the pulmonary vein which goes from the lungs to the heart) and contain blood under low pressure and Capillaries that are microscopic vessels found in the muscles and lungs and are the sites where gas exchange takes place as oxygen passes through the capillary wall and into the tissues, carbon dioxide passes from the tissues into the blood
Blood has four key components: Plasma which is the fluid part of blood and carries carbon dioxide, hormones and waste, Red blood cells that contain haemoglobin which carries oxygen, White blood cells that are an important part of the immune system and Platelets that clump together to form clots.
A diagram of human embryonic development:
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The heart is a muscular pump that pumps blood to the lungs and around the body.
The heart has four chambers. The two atria collect the blood. The two ventricles pump the blood out of the heart. Valves prevent the blood from flowing backwards. The septum separates the two sides of the heart. The right side of the heart pumps de-oxygenated blood (blood not containing oxygen) to the lungs to pick up oxygen. The left side of the heart pumps the oxygenated blood from the lungs around the rest of the body.
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Notes
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Heart regeneration
Different regenerative capacities of the hearts of adult humans, adult zebrafish and neonatal mice (http://www.escardio.org)
Models used to study heart regeneration in the zebrafish (http://www.escardio.org)
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Notes
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Heart disease Cardiovascular disease (CVD) is an umbrella term that includes all the diseases of the heart and circulation including coronary heart disease, angina, heart attack, heart valce disease, cardiomyopathy, congenital heart disease and stroke. CVD is also known as heart and circulatory disease.
Risk factors
Genetics
Age
Gender
Lifestyle
Diet
Notes
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Careers session
Notes
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Workshop 1 Meet the patient
Notes
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Workshop 2 DNA lab
In this session, you will carry out a diagnostic technique known as DNA gel electrophoresis. This is used to
separate DNA molecules according to their size and charge, and can help researchers identify the affected
individual in a family.
Before you receive the DNA for this practical, it has undergone two biological techniques: PCR and RFLP.
1) PCR
Polymerase chain reaction (PCR) is used to amplify the DNA extracted from a patient, from few copies to thousands
or millions of copies. This is achieved using a polymerase enzyme at alternating temperatures.
Q1. Why do we need to amplify the DNA first?
Q2. Why is temperature cycling necessary?
2) RFLP
Restriction fragment length polymorphism (RFLP) can be used to identify differences between DNA sequences. An
enzyme called a restriction enzyme is used to cut the DNA wherever a specific sequence occurs. If the specific
sequence contains a mutation, the enzyme will not cut the DNA, resulting in fragments of differing length.
Diagram 1
Q3. Explain how the situation in Diagram 1 allows us to differentiate DNA sequences containing a mutation.
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3) DNA Gel Electrophoresis
DNA gel electrophoresis is used to separate DNA molecules according to their size and charge. An electrical field is
applied to the DNA gel; since DNA is negatively charged, it moves towards the positive electrode. We can then view
the gel under ultraviolet light to identify different genotypes.
Diagram 2
Q4. Make notes of the steps involved in carrying out DNA gel electrophoresis.
Q5. Do you have any questions about the techniques you have used in the DNA lab?
________
__________________________
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Workshop 3 Genetic counselling
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Drawing a family pedigree
Modes of inheritance
autosomal dominant
autosomal recessive
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X‐linked dominant
X‐linked recessive
Draw the family tree of the patient from Workshop 2:
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Workshop 4 Histology
Part 1
Histological stains are used in clinics and in pathology labs to assess the tissues and understand more about disease
progression, post‐operative complications, cause of death etc. It is possible to assess the severity of
cardiomyopathies by sampling muscle biopsies from patients. Pathologists have developed biological assays to
assess heart condition in patients with heart diseases.
Normal healthy heart Scarring after heart attack
Section cut through here
Scar tissue stains blue, healthy heart red.
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Part 2
Following fertilisation, development from a single cell to a multi‐cellular, complex organism is orchestrated by the
expression and regulation of our genes. Alterations (mutations) to key genes necessary for normal devolvement can
disrupt this tightly regulated network, which in turn, can alter the way in which the forming cells develop and
communicate with each other. Sometimes this can have serious consequences for an individual who carries such a
mutation, manifesting as a genetic disease.
Animal models are a powerful tool that can be used to mimic changes to DNA enabling researchers to investigate
what effects these changes have on cells and how this causes disease. Comparison of human and mouse DNA has
revealed that most protein coding genes are common between both species. However, owing to differences
between human and mouse genomes, both in structure and regulation, it is perhaps unsurprising that mouse models
do not always reflect the human disease phenotype they are designed to imitate. Therefore, if we are to fully
understand human genetic disease it is necessary to carry out research directly in human tissue.
Understanding both the anatomical and molecular biological differences between humans and mice during normal
development is an important goal in not only being able to answer the key question “what makes us human?”, but
can also provide insight into what extent we can extrapolate the data that is being generated from animal models of
genetic human diseases.
The most obvious differences in the physical appearance of two species are seen following birth; however, important
phenotypic differences can be seen between human and mouse even at the very early stages of the developing
embryos.
Can you identify which are the mouse and which are the human embryos from the histology slides and give a reason
for your answer?
A 1
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B 2
C 3
D 4
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Workshop 5 Animal models of disease
What is an animal model?
Why do scientists use them and how do they compare to humans?
Which species would you choose for an experiment?
Mouse
Genetically identical
Fast lifecycle
Sequenced genome/easy genetic manipulation
Ideal for studying more complex body systems
Activity 1 Compare the 2 skeletons using the diagram below. What can you see?
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Zebrafish
transparent embryos (ideal for microscopy)
rapid development (outside the womb)
1 pair of adult fish will produce a large number of embryos
drugs can be tested easily by adding them to the water
Activity 2 Label the images in the correct order
A. zebrafish egg
B. 1‐cell stage (20 min)
C. 8‐cell stage (1h 15 min)
D. 16h
Activity 3 Under the microscope
Can you see the features of the embryos
Can you see the heart of the embryo?
How old is each embryo?
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5 min PhD workshop
Notes
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From bench to bedside (drug development and clinical trials)
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Notes
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Feedback form
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