CG020 Genomika
Přednáška 12
Praktické aplikace genomiky
Jan Hejátko
Funkční genomika a proteomika rostlin,
Středoevropský technologický institut (CEITEC)
a
Národní centrum pro výzkum biomolekul,
Přírodovědecká fakulta,
Masarykova univerzita, Brno
hejatko@sci.muni.cz, www.ceitec.eu
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 Literární zdroje ke kapitole 12:
Broughton, J.P., Deng, X., Yu, G., Fasching, C.L., Servellita, V., Singh, J., Miao, X., Streithorst,
J.A., Granados, A., Sotomayor‐Gonzalez, A., Zorn, K., Gopez, A., Hsu, E., Gu, W., Miller,
S., Pan, C.Y., Guevara, H., Wadford, D.A., Chen, J.S., and Chiu, C.Y. (2020). CRISPR‐Cas12‐
based detection of SARS‐CoV‐2. Nat Biotechnol 38, 870‐874.
Dietel, M., and Sers, C. (2006). Personalized medicine and development of targeted therapies:
The upcoming challenge for diagnostic molecular pathology. A review. Virchows Arch 448,
744‐755.
Gaudelli, N.M., Komor, A.C., Rees, H.A., Packer, M.S., Badran, A.H., Bryson, D.I., and Liu, D.R.
(2017). Programmable base editing of A*T to G*C in genomic DNA without DNA cleavage.
Nature 551, 464‐471.
Goh, K.I., Cusick, M.E., Valle, D., Childs, B., Vidal, M., and Barabasi, A.L. (2007). The human
disease network. Proc Natl Acad Sci U S A 104, 8685‐8690.
Chen, J.S., Ma, E., Harrington, L.B., Da Costa, M., Tian, X., Palefsky, J.M., and Doudna, J.A.
(2018). CRISPR‐Cas12a target binding unleashes indiscriminate single‐stranded DNase
activity. Science 360, 436‐439.
Koblan, L.W., Erdos, M.R., Wilson, C., Cabral, W.A., Levy, J.M., Xiong, Z.M., Tavarez, U.L.,
Davison, L.M., Gete, Y.G., Mao, X., Newby, G.A., Doherty, S.P., Narisu, N., Sheng, Q.,
Krilow, C., Lin, C.Y., Gordon, L.B., Cao, K., Collins, F.S., Brown, J.D., and Liu, D.R. (2021). In
vivo base editing rescues Hutchinson‐Gilford progeria syndrome in mice. Nature.
Li, X., Qian, X., Wang, B., Xia, Y., Zheng, Y., Du, L., Xu, D., Xing, D., DePinho, R.A., and Lu, Z.
(2020). Programmable base editing of mutated TERT promoter inhibits brain tumour
growth. Nat Cell Biol 22, 282‐288.
Literatura
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
 Genová terapie
 Biotechnologie
 Geneticky Modifikované Organismy
 Transgenoze
 Editování genomu
 Modelové organismsy
 Principy PCR
Osnova
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 Lékařství
 Molekulární diagnostika
Osnova
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Molekulární Diagnostika
 Cca 10,000 onemocnění u člověka je podmíněno mutací v
jediném genu
 cystická fibróza
 srpkovitá anémie
 svalová dystrofie
 β-talasémie
 ….
 Časná molekulární diagnostika
 mutace nebo infekce
 PCR
 Hybridizace na DNA čipu hybridization
 Cas-based
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Molekulární Diagnostika
 Mammoth Biosciences
 Spoluzakladatelka Jenifer Doudna https://youtu.be/IPe4IdgKGdQ
It has been fouynd that binding of gRNA=targeted CRIPSR to the target
sequence activates ssDNA cleavage activityt of Cas12. “By combining Cas12a
ssDNase activation with isothermal amplification, we create a method termed
DNA endonuclease-targeted CRISPR trans reporter (DETECTR), which achieves
attomolar sensitivity for DNA detection. DETECTR enables rapid and specific
detection of human papillomavirus in patient samples, thereby providing a simple
platform for molecular diagnostics.” (Chen et al., 2018). The approach was used
also for designing the CRISPR-based detection of SaRs-Cov-2 (Broughton et al.,
2020).
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
Osnova
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Individualizovaná
Medicína
 Využívá znalost genomu pro:
 Předpověď zdravotních rizik
 Diagnositku
 Výběr nejvhodnějšího typu léčby
 minimalizuje nežádoucí efekty léčby
 prevence
http://www.personalizedmedicinecoalition.org/
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9 http://www.personalizedmedicinecoalition.org/
Individualizovaná
Medicína
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Individualizovaná
Medicína
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http://www.personalizedmedicinecoalition.org/
Individualizovaná
Medicína
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12http://www.personalizedmedicinecoalition.org/
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13http://www.personalizedmedicinecoalition.org/
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 Problém:
 Mnohofaktoriální podmíněnost většiny lidských
onemocnění
Individualizovaná
Medicína
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Goh et al., 2007
Genové interakce u
lidských onemocnění
In the disease gene network, each node is a gene, with two genes being
connected if they are implicated in the same disorder. The size of each node is
proportional to the number of disorders in which the gene is implicated (see key).
Nodes are light gray if the corresponding genes are associated with more than
one disorder class. Genes associated with more than five disorders, and those
mentioned in the text, are indicated with the gene symbol. Only nodes with at
least one link are shown.
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 Řešení problému:
 Systémová biologie – využívá např. genové klastrování k identifikaci
genů asociovaných s pozorovaným jevem (nemocí, poruchou, ..)
Topotecan
-resistant
Topotecan
-sensitive
Dietel and Sers, 2006
Individualizovaná
Medicína
Hierarchical clustering analysis exemplified for Topotecan-resistant (R) and
Topotecan-sensitive (S) cell lines. All cell lines resistant to Topotecan (left panel)
and all cell lines sensitive to Topotecan (right panel) express a unique set of
genes. Each row in the cluster indicates the expression profile of a specific gene
across all 19 cell lines. Each column indicates the individual cell line in which the
gene is expressed.
Red, green, and black squares indicate that expression of the gene is greater
than, less than, or equal to the median level of expression across all cell lines,
respectively. The scale bar reflects the fold increase (red) or decrease (green) for
any given gene relative to the median level of expression across all samples.
Dietel and Sers, 2006.
Topotecan, sold under the brand name Hycamtin among others, is a
chemotherapeutic agent medication that is a topoisomerase inhibitor. It is a
synthetic, water-soluble analog of the natural chemical compound camptothecin.
It is used in the form of its hydrochloride salt to treat ovarian cancer, lung cancer
and other cancer types (Wikipedia).
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 Řešení problému:
 biomarkery
 testy
The Case for Personalized Medicine, 3rd edition
Individualizovaná
Medicína
Aplikace přístupů systémové biologie (včetně genového klastrování na
předchozím snímku) pak umožní identifikovat specifické markery a testy, které
umožní testovat odpověď na různé typy terapií.
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 Další problémy
 Etické otázky
 Možnost zneužití znalosti genomu
 riziko: nedostatečná ochrana dat
 V některých zemích je uzákoněn omezený přístup pro určité typy
zaměstnanců nebo pojišťovací společnosti
 Vysoké náklady
 Dělení medicíny na first-class and low-class služby
 Zvětšování problému globalizačního handikapu – chudé země si
nemohou takto pokročilý typ léčby dovolit
 Soukromí
 Zásadní a komplikovaná otázka
 Jakou informaci lze považovat za soukromou?
Individualizovaná
Medicína
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
 Genová terapie
 Biotechnologie
Osnova
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Procedure in which the DNA sequence is inserted into
the patient genome to replace or supplement the original
gene
 Options:
 replace the mutated gene
 repair the mutation
 deliver DNA encoding a therapeutic protein
 antisense therapy
 In the future useful for treating e.g. hereditary diseases
 Types:
 somatic gene therapy
 gene therapy of germ cells
Gene Therapy
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Gene Therapy
 Hutchinson–Gilford progeria
syndrome
 C•G-to-T•A mutace (c.1824 C>T;
p.G608G) v genu pro laminin (LMNA)
 Defekt v sestřihu RNA vede k tvorbě
toxického proteoinu progerinu
 Věk dožití cca 14 let
 In vivo oprava pomocí ABEs potvrzena
u myší a lidských fibroblastů (Koblan et
al., 2021)
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Adenine Base Editors
Gaudeli et al., 2017
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Adenine Base Editors
Kuraoka, 2005
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 Methods
 viral vectors
 retroviruses
 adenoviruses
 herpes simplex virus
 non-viral methods
 injection of plasmid DNA into muscle
 increased efficiency of DNA delivery
 electroporation
 sonoporation
 „gene gun“ (biolistic)
 magnetofection
 genome editing
Gene Therapy
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Ethical Issues
 Regulace editace genomu v zemědělství a lidském zdraví
 https://crispr-gene-editing-regs-tracker.geneticliteracyproject.org/
 International Commission on the Clinical Use of Human
Germline Genome Editing
 convened by the U.S. National Academy of Medicine (NAM), the U.S.
National Academy of Sciences (NAS), and the Royal Society of the U.K. …
 …to identify a number of scientific, medical, and ethical requirements that
should be considered, and could inform the development of a potential
pathway from research to clinical use — if society concludes that heritable
human genome editing applications are acceptable
 more details at https://nationalacademies.org/gene-editing/international-
commission/index.htm
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Ethical Issues
 Alliance for Regenerative Medicine
 international group representing the cell and gene therapy sector
 put out a “statement of principles” on genome editing endorsed by 13 of the
most active companies in this field
 changing heritable DNA in sperm, eggs or a new embryo — came true in
November 2018 when He Jiankui, a Chinese biophysicist, said that his lab had
edited two baby girls to make them resistant to HIV infection. This mutation will
be inherited by their descendants.
 31 clinical trials for gene edited therapies are in progress around the world, 20
of which are in oncology. None is yet close to commercialization. The US has
the largest number of trials (19) followed by China (10) and the UK (6)
FT, Clive Cookson, Science Editor August 27 2019
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Ethical Issues
 Genome editing as a bioweapon?
 ongoing research program funded by the U.S. Defense Advanced Research
Projects Agency (DARPA)
 aims to disperse infectious genetically modified viruses that have been
engineered to edit crop chromosomes directly in fields
 the means of delivery of these viral horizontal environmental genetic alteration
agents (HEGAAs) into the environment should be insect-based dispersion
 Part of scientific community does not find the program useful for the U.S.
agriculture, but points to its possible misuse
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Editing as a bioweapon?
Reeves et al., 2018
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 Medicine
 Molecular Diagnosis
 Personalized Medicine
 Gene Therapy
 Biotechnology
Outline
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BIOTECHNOLOGY
 It uses living organisms, cells or parts of cells (enzymes) for
research, leading to new products and applications in
medicine, agriculture, food, environmental protection
 Also used in developing better/sustainable production
methods for the chemical industry and other industrial
processes
 An interdisciplinary approach requiring knowledge of
chemistry, biology, physics, material sciences, engineering
and informatics
 The origin of biotechnology can be traced 4,000 years back,
when the Sumerians (although not knowingly) used microbes
for the production of alcoholic beverages.
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BIOTECHNOLOGY
 Examples
 effective utilization of plant biomass for fuel production
 acquisition of starting material (monomers) for the
production of polymers from living organisms instead of
from fossil sources
 phytopharmaceuticals – using plants in new vaccination
methods such as expression of antibodies or antigens
suitable for immunization
 European Federation of Biotechnology
http://www.efb-central.org
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
 Genová terapie
 Biotechnologie
 Geneticky Modifikované Organismy
 Transgenoze
Osnova
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0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
1961 1997 2050
hectarespercapita
Source: UN Millennium Ecosystem Assessment
Human Population vs
Arable Land Availability
Our civilization is built on farming, the surface area needed for feeding people
has decreased by 90% over 10,000 years .
To prevent collapse, it is necessary to reduce this area from the current 0.45
ha/person to 0.2 ha/person by the year 2050. Return to original methods of
agriculture would be a return to the original demands on area and therefore would
be unsustainable Intensive farming = conversion of water and oil into food.
The goal of plant biotechnology is to use all the available scientific knowledge
to breed varieties with higher yield with lower inputs (of land, water, fertilizers,
sprays ...)
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Nutrition Deficiency
https://qz.com/africa/1064653/the-world-could-run-out-of-food-two-decades-earlier-than-thought/
…as soon as in 2027?
The world-total deficiency in food production of…
Announced recently by Quartz server, the world could be facing a 214 trillion 
calorie deficit in the food production (announced as soon as in 2027. 
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 organisms naturally vary due to mutations
 before the era of genetic engineering question
of chance
 breeding tools
 selection and crossing
 modern breeder learned to change hereditary
information – increase the mutants allele
frequency
 chemicals, radiation ...
 results are incidental/non-targeted
Success
is not always visible at a glance
Breeding
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 Targeted modification ("targeted breeding")
 ability to transfer genes = transgenosis
 the first practical application: production of
human insulin in bacteria - 1978
Genetic Engineering
Boyer a Swanson – firma Genentech
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Plant Transgenosis
https://www.youtube.com/watch?v=yesNHd9h8k0
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Breeding Vs. Genetic Engineering
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 Organisms carrying modified genetic information –
either own or foreign (from another organism),
enabling targeted changes in the organism and its
use for specific purposes
 GMOs
 plants
 bacteria
 animals
http://www.gmo-compass.org/
Geneticaly Modified Organisms
(GMOs)
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 resistance to pests
 herbicide resistance
 resistance to drought
 resistance to cold
 resistance to salinity
 more efficient nitrogen utilization
 increasing nutritional quality
http://ipbo.vib-ugent.be/
Geneticaly Modified Plants
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 resistance to insect pests
 corn, cotton, rice
 genes from Bacillus thuringiensis
(Bt)
 Expression of crystalline deltaendotoxins
- Crystal (Cry) proteins
 increasing yields, reducing the
amount of chemical sprays
Bt Plants
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Bt Plants
When the Cry protein reaches the gut, it is partially degraded, releasing a smaller and
potentially toxic part of the protein [6]. But this toxin will only be active if it finds the right
matching protein receptor sticking off the cells lining the gut of a larval insect. This is the
most important aspect of the Cry toxin mechanism. Much in the same way that a certain
key will only open a certain lock, the Cry toxin can only exert its toxic effect on a
particular cell receptor. Consequently, the toxin tends to only impact insects within a
particular taxonomic order.
Once the toxin is bound, the process is fairly straightforward. The toxin recruits other Cry
toxins to the same cell and together they form a hole in cell’s membrane that ultimately
causes the cell to burst [6]. The cumulative effect of this happening to many cells is the
irreversible destruction to the midgut membrane, compromising the barrier between the
body cavity and gut. Without this barrier, Bt spores and other native gut bacteria can
infiltrate and grow within the nutrient-rich body of the insect [4-5].
What makes Bt such a great candidate for pesticide and GM applications is that while
these Cry toxins are highly effective against insects, they have been shown to be safe for
consumption by mammals. Tests by the EPA have demonstrated that Cry proteins, like
any other benign dietary protein, are very unstable in the acidic stomach environment.
Furthermore, an oral toxicity test, which involves giving mice exceptionally high doses of
purified toxic Bt proteins, showed no significant health impacts. In their 2001
reassessment of several Bt Cry proteins, the EPA concluded from these findings that
“there is reasonable certainty that no harm will result from aggregate exposure to the
U.S. population, including infants and children, to the Cry1AB and Cry1F proteins and
the genetic material necessary for their production.” Similar conclusions were drawn
about the Cry1Ac protein of Bt cotton [7]. Other mouse studies on have shown that even
high doses of truncated Cry proteins, such that only the toxic region is conserved, have
no deleterious effects [8]. A paper in Annual Review of Entomology from 2002 also
makes the strong point that, in addition to no demonstrated toxicity of Bt toxins, their use
provides important health benefits to livestock and humans by preventing certain insectcaused
crop diseases that produce toxic and carcinogenic compounds [13].
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Ht Plants
 resistance to systemic herbicides
 glyphosate
 interferes with the synthesis of aromatic amino acids; animals
without the appropriate enzymatic apparatus = harmless
 blocks the enzyme 5-enolpyrovylshikimate-3-phosphate
synthase (EPSPS) in chloroplasts – affects green plants
 ineffective for bacterial EPSPS - evolutionarily divergent
 soya, maize, sugar beet, canola, cotton, alfalfa - added
enzyme for tolerance
 company Bayer (Monsanto), trade name Roundup
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Ht Plants
 resistance to systemic herbicides
 glufosinate (phosphinothricin)
 prevents processing of ammonium - toxic
 Streptomyces hygroscopicus synthesizes and transforms it:
acetylation by the enzyme phosphinothricin acetyltransferase
– coding gene isolated in 1987 - named bar
 trade names: Basta, Liberty, Finale, Radical ...
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Multiresistant Plants
 Bt resistance + herbicide
 multiresistant corn - the majority of total
production in the USA
 example of multiresistant corn:
 three Bt genes for resistance to air pests
 three Bt genes for resistance against soil pests
 two genes for herbicide resistance
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 viruses - no chemical agents available
 gene encoding non-infectious viral envelope protein increases
resistance to viral infection
 banana; papaya - Hawaii, Southeast Asia
 cassava - a basic food ingredient for more than 500 million people +
animal feed
Disease-Tollerant Plants
Hlízy manioku (cassava) tvoří základní potravinovou složku pro více než 500 milionů
lidí. Rovněž se využívá jako krmivo - zkrmuje se v podobě maniokové moučky hlavně
prasatům, skotu, ovcím a kozám.
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 Chickpeas - more resistant to
drought, but toxic
 GMOs with inactivated toxin
 Corn resistant to drought
Lathyrus sativus
Chickpea
Cereals
Drought in Ethiopia
Disease- and Stress-Tollerant Plants
Hrachor – Lathyrus sativus
Cizrna – Chickpea
Obiloviny - Cereals
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 use of nitrogen from fertilizers
 rice with gene from barley - 3x higher nitrogen utilization
under oxygen deficiency
Nitrogen Use Efficiency
When crops are supplied with excess nitrogen fertilizer to gain maximal yields the excess
nitrogen is converted into the gas nitrous oxide (N2O) and also leaches into rivers. N2O
has 300x the Global Warming Potential of CO2 and nitrogen fertilizer runoff creates
marine dead zones, such as in the Gulf of Mexico at the mouth of the Mississippi river.
Crops that have the ability to grow well with less nitrogen, because of enhanced uptake
or similar characteristics, result in less N2O release and less N runoff. This lessens the
effect of fertilizer nitrogen on global warming and lake and marine pollution.
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 Golden rice
 several genes from maize encoding enzymes
for the biosynthesis of β-carotene (precursor of
vitamin A)
 Canola and Soybean
 improved oil properties: stable, resistant to high
temperatures, long storage
Improved Nutrition Value
While most biotech crops have characteristics that enhance their cultivation, those with
enhanced consumer characteristics are being developed. For example many children in
SE Asia develop blindness because of a deficiency of vitamin A. Golden rice is
engineered with genes from maize to be high in the precursor of vitamin-A that when
eaten is converted to vitamin-A in order to prevent blindness in developing countries.
High oleic soybean and canola oil are now available. Oil with this fat profile is more
stable, allowing for greater heat tolerance and longer shelf life.
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 Transgenic cats
 lentiviruses are sensitive to restriction factors
 specific restriction factor: rhesus macaque TRIMCyp + eGFP
 uniform expression, no mosaicity and no silencing in F1 generation
 lymphocytes of transgenic animals resistant to replication of FIV
Wongsrikeao et al., 2011, Nature Methods
GMO Animals
Feline immunodeficiency virus (FIV), the “cat AIDS" is a Lentivirus that affects
cats worldwide, with 2.5% to 4.4%[1][2] of felines being infected (Wikipedia)
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
 Genová terapie
 Biotechnologie
 Geneticky Modifikované Organismy
 Transgenoze
 Editování genomu
Osnova
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Gene Editing in Plant
Domestication
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
 Genová terapie
 Biotechnologie
 Geneticky Modifikované Organismy
 Transgenoze
 Editování genomu
 Modelové organismy
Osnova
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 Low requirements for area
 Relatively large number of offspring (3-14, 6-8 on
average)
 Genome size is close to the size of human genome
(about 3000 Mbp), the number of genes as well (about
24K)
 20 chromosomes (19+1)
 Suitable for a wide range of physiological experiments
(anatomical and physiological similarity to human)
 Possibility to obtain (quite easily) KO mutants and
transgenic lines
Mus musculus
house mouse
More info about mouse at http://www.informatics.jax.org/greenbook/index.shtml.
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 Genome known since 2002
(http://www.ncbi.nlm.nih.gov/projects/genome/assembly/grc/mouse/)
Mus musculus
house mouse
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 Low requirements for cultivation area
Arabidopsis thaliana
mouse-ear cress
 High number of seeds (20.000 per plant and more)
 Small and compact genome, (125 MBp, about
25.000 genes, average size 3 kb)
 5 chromosomes
 Suitable for wide range od physiological experiments
 High natural variability (approximately 750 ecotypes
(Nottingham Arabidopsis Seed Stock Centre))
Columbia 0 Landsberg 0 Wassilewskija 0
http://seeds.nottingham.ac.uk/
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Arabidopsis thaliana
mouse-ear cress
 Genome known since 2000 (http://www.arabidopsis.org/)
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 Lékařství
 Molekulární diagnostika
 Individualizovaná medicína
 Genová terapie
 Biotechnologie
 Geneticky Modifikované Organismy
 Transgenoze
 Editování genomu
 Modelové organismsy
 Principy PCR
Osnova
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 Techniky využivající pokročilé přístupy zásadním,
způsobem mění naše možnost v medicíně i
zemědělství
 Možnost programovatelné editace genomu slibuje
zásadní obrat v léčbě zejména dědičně
podmíněných chorob a ve šlechtění nových odrůd i
ras
 Je nezbytná přísná kontrola s jasně nastavenými
pravidly pro všechny, ale nikoliv úplný zákaz
Klíčové koncepty
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Diskuse