Stem Cells and Cloning - PowerPoint PPT Presentation

Loading...

PPT – Stem Cells and Cloning PowerPoint presentation | free to download - id: 3b6e77-MjZhN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Stem Cells and Cloning

Description:

Stem Cells and Cloning Two Types Embryonic- created by means of in vitro fertilization. They are harvested after 5-6 days from a cell know as a blastocyst. – PowerPoint PPT presentation

Number of Views:113
Avg rating:3.0/5.0
Slides: 63
Provided by: facultyMd3
Learn more at: http://faculty.mdc.edu
Category:
Tags: cells | cloning | stem

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Stem Cells and Cloning


1
Stem Cells and Cloning
2
Two Types
  • Embryonic- created by means of in vitro
    fertilization. They are harvested after 5-6 days
    from a cell know as a blastocyst. They do not
    come from aborted fetuses. They have the
    potential to change into any type of cell found
    in body.
  • Adult found in bone marrow. Harvested at any
    time in a adult persons life. Potential to
    become only a limited number of specialized cells.

3
Stem Cells
  • Embryonic Stem cells the potential to develop
    into many different cell types in the body.
  • Theoretically divide without limit to replenish
    other cells as long as the person or animal is
    still alive.
  • Each new cell has the potential to either remain
    a stem cell or become another type of cell with a
    more specialized function, such as a muscle cell,
    a red blood cell, or a brain cell.

4
Two Important Traits
  • Stem cells have two important characteristics
    that distinguish them from other types of cells.
  • First, they are unspecialized cells that renew
    themselves for long periods through cell
    division. The second is that under certain
    conditions, they can become cells with special
    functions such as the beating cells of the heart

5
For over 20 Years
  • Scientists discovered ways to obtain or derive
    stem cells from early mouse embryos more than 20
    years ago.
  • In 1998, of how to isolate stem cells from human
    embryos and grow the cells in the laboratory.
  • These are called human embryonic stem cells

6
Embryonic Stem Cell
  • HUMAN EMBRYO five to six days after
    fertilization, called a blastocyst, is opened to
    retrieve the inner cell mass (red bulge) that
    produces embryonic stem cells

7
(No Transcript)
8
Embryonic Stem Cells Cont.
  • Embryonic Stem Cells, are derived from embryos
    that develop from eggs that have been fertilized
    in vitro- in an in vitro fertilization clinicand
    then donated for research purposes with informed
    consent of the donors.
  • They are not derived from eggs fertilized in a
    woman's body.

9
Blastocyst
  • The embryos from which human embryonic stem cells
    are derived are typically five or six days old
    and are a hollow microscopic ball of cells called
    the blastocyst.

10
(No Transcript)
11
Adult Stem Cell
  • An undifferentiated cell found in a
    differentiated tissue that can renew itself and
    (with certain limitations) differentiate to yield
    all the specialized cell types of the tissue from
    which it originated.
  • Adult tissues, such as bone marrow, muscle, and
    brain, contain adult stem cells that can generate
    replacements for cells that are lost through
    normal wear and tear, injury, or disease.

12
Adult Stem Cell Cultivation
13
Adult Stem Cell Cont.
  • The primary roles of adult stem cell in a living
    organism are to maintain and repair the tissue in
    which they are found.
  • Some scientists now use the term somatic stem
    cell instead of adult stem cell.
  • Unlike embryonic stem cells, which are defined by
    their origin (the inner cell mass of the
    blastocyst), the origin of adult stem cells in
    mature tissues is unknown.

14
History of Adult Stem Cells
  • In the 1960s, researchers discovered that the
    bone marrow contains at least two kinds of stem
    cells.
  • Hematopoietic stem cells, forms all the types of
    blood cells in the body.
  • Bone marrow stromal cells, was discovered a few
    years later. Stromal cells are a mixed cell
    population that generates bone, cartilage, fat,
    and fibrous connective tissue.

15
Adult stem cells in the Body
  • Adult stem cells have been identified in many
    organs and tissues. There are a very small number
    of stem cells in each tissue.
  • Stem cells are thought to reside in a specific
    area of each tissue where they may remain
    (non-dividing) for many years until they are
    activated by disease or tissue injury.
  • The adult tissues reported to contain stem cells
    include brain, bone marrow, peripheral blood,
    blood vessels, skeletal muscle, skin and liver.

16
The Promise of Stem Cells
  • Some of the most serious medical conditions, such
    as cancer and birth defects, are due to problems
    that occur somewhere in this process.
  • A better understanding of normal cell development
    will allow us to understand and perhaps correct
    the errors that cause these medical conditions.

17
Embryonic Stem Cell Therapies
  • Scientists have been able to do experiments with
    human embryonic stem cells (hESC) only since
    1998, when a group led by Dr. James Thompson at
    the University of Wisconsin developed a technique
    to isolate and grow the cells.
  • Federal funds to support hESC research have been
    available since only August 9, 2001, when
    President Bush announced his decision on Federal
    funding for hESC research.

18
President Bush on Stem Cells
  • Research on embryonic stem cells raises profound
    ethical questions, because extracting the stem
    cell destroys the embryo, and thus destroys its
    potential for life.  Like a snowflake, each of
    these embryos is unique, with the unique genetic
    potential of an individual human being.

19
President Bush loves stem cells
20
Federal Funding for Existing Cells
  •      As a result of private research, more than
    60 genetically diverse stem cell lines already
    exist.  They were created from embryos that have
    already been destroyed, and they have the ability
    to regenerate themselves indefinitely, creating
    ongoing opportunities for research.  I have
    concluded that we should allow federal funds to
    be used for research on these existing stem cell
    lines, where the life and death decision has
    already been made. President Bush

21
Michael J. Fox Proponent of stem cell research
22
Michael J. Foxs View
  • Stem cell research is a critical pathway to a
    cure... Stem cells can be used for cell
    replacement therapy, to actually produce dopamine
    neurons that have been lost.
  • You can't do research on living human neurons.
    But you can use stem cells to create them and
    study how they work and the impact of various
    drugs. It's huge.

23
Stanford University scientist, Irving Weissman
  • Warns that the country risks falling behind South
    Korea, China, Britain and other countries in
    biomedical research if the Bush administration
    and Congress continue to restrict embryonic stem
    cell research for philosophical and religious
    reasons.
  • In the past, the United States regulated, but
    never banned, controversial research. In
    contrast, Russia did ban research and fell
    decades behind in the 1930s when it banned
    genetics research.

24
Human Cloning
25
Why clone?
  • Cloning will help us put an end to so many
    diseases, give infertile men the chance to have
    children. We can't miss this opportunity
  • Doctor Severino Antinori

26
Doctor Severino Antinori
  • An Italian gynecologist who runs a fertility
    clinic in Rome, has suddenly leaped into the
    world's headlines by announcing his plans to
    clone the first human beings.

27
Cloner and baby maker
  • Italian embryologist Dr Severino Antinori is at
    the centre of the heated debate on human cloning.
    Three years ago, Dr Antinori announced plans to
    use cloning technology to help infertile couples
    have children. The technology had been pioneered
    by British scientists to produce Dolly the sheep,
    the world's first vertebrate clone made from an
    adult mammalian cell.

28
Clone is coming
  • Earlier this year, Dr Antinori predicted that he
    would complete the first human cloning operation
    within 18 months.
  • The 55-year-old Dr Antinori was previously best
    known for his work in in vitro fertilization, and
    in particular for enabling women in their 50s and
    60s to give birth.

29
63 year old Mommy
  • He shot to prominence in 1994 when he helped a
    63-year-old woman to have a baby by implanting a
    donor's fertilized egg in her uterus, making her
    the oldest known women in the world to give
    birth.

30
  • Dr Antinori, who runs a fertility clinic in Rome,
    plans to make his method of human cloning
    available to couples who cannot have children by
    any other means - for example, when test tube
    fertilization is impossible because the man
    produces no sperm.

31
Cloning daddy
  • Genetic material from the father would be
    injected into an egg, which would then be
    implanted into the woman's womb to grow.
  • The resulting child would, in theory, have
    exactly the same physical characteristics as the
    father.

32
1500 volunteers
  • Dr Antinori told an Italian newspaper recently
    that more than 1,500 couples had volunteered as
    candidates for his research program, and that he
    planned to start producing embryo clones in
    November.
  • He is working in close co-operation with Dr Panos
    Zavos, an American fertility expert.

33
Banned in EU and US
  • He also faces the outrage of those who oppose the
    procedure on ethical and moral grounds. The
    practice of human cloning is banned in Europe and
    formal legislation is now going through Congress
    in the United States.

34
A hidden Lab
  • Dr Antinori has proposed carrying out the
    procedure in an unnamed Mediterranean country, or
    on a boat in international waters.

35
Its the medias fault.
  • In 1998, Dr Antinori told the BBC it would be
    immoral to try to clone humans just for the sake
    of it, but he justified his work as an attempt to
    help infertile couples. "Generally, people are
    against human cloning, and I blame the media for
    pre-judging it. I want to bring society with me,
    and persuade people that it is right in rare
    cases to help infertile couples,"

36
Cloned Baby IN 2002?
  • In December 2002 the Raelians- an obscure French
    cult, claimed to have cloned the first human.

37
THE RAELIAN MOVEMENT
  • Founded  1973, FranceFounder Claude Vorilhon,
    who took the name Rael his book is "The Final
    Message"Basic tenet The old Hebrew
    phrase "Elohim" -- usually translated as a name
    for God -- should have been interpreted as a
    reference to non-Earthlings "from the sky." 
    These entities are, Raelians say, responsible for
    the creation of life on Earth.Membership The
    organization says it comprises some 40,000
    members worldwide, with highest concentrations in
    France, Canada and Japan. Outside researchers
    have suggested the membership may be smaller.

38
BRIGITTE BOISSELIER
  •   Brigitte Boisselier is the scientific director
    of Clonaid, a company devoted to creating human
    clones. Based in the Bahamas, Clonaid is funded
    by the Raelians Movement
  • Clonaid includes two other divisions Clonapet, a
    service for cloning dear departed companion
    animals, and Insureaclone, a service designed to
    preserve the DNA of living people for future
    cloning

39
Was the Baby Cloned?
  • Dr. Boisselier, said "Science can be used for the
    best and the worst. I believe that this is the
    best.

40
Clone a baby?
  • The media ran the report for several weeks-
    proclaiming that science had finally gone too
    far!
  • Channel 7 ran the story 84 times!

41
Fooled
  • After the Hoax was announced channel 7 ran a
    story on how dumb they were!

42
Another Cloned Baby
  • Tuesday, 25 March, 2003,
  • Company shows 'cloned baby'
  • A company claiming to have created the world's
    first cloned babies has distributed a photograph
    of one of the "clones" for the first time.

43
Clonaid
  • Clonaid said a picture of an infant in an
    incubator published on its website showed the
    third of five babies supposedly cloned since
    December.
  • Many scientists have dismissed Clonaid's claim
    that any babies were ever cloned at all, pointing
    to the absence of DNA proof.

44
Brigitte
  • But the company, which is linked to a sect
    maintaining that humans were created by aliens,
    insists the picture shows "the third clone baby",
    allegedly born in Japan.
  • Its president, Brigitte Boisselier, handed out
    copies of the photograph on a visit to Brazil to
    promote the company.

45
2002/ 2003 clones
  • Accompanying Ms Boisselier is Raelian founder and
    leader Claude Vorilhon, known as Rael.
  • Clonaid says that five babies have been cloned
    and are all doing well
  • Eve, the first, was allegedly born to US parents
    on Boxing Day
  • A second cloned baby girl is said to have been
    born to a Dutch lesbian on 3 January with a
    third, a boy, allegedly born in Japan later that
    month
  • A fourth "cloned baby" was born to Saudi Arabian
    parents on 27 January, Clonaid says, and a fifth
    on 4 February.

46
In Vitro Fertilization
  • How old is too old to have a baby?
  • 40? 50?... 63????
  • Dr. Severino Antinori, the cloner, is helping
    older couples have babies.

47
Doctor defends IVF for woman, 63 years old!
  • A controversial fertility doctor has defended his
    decision to give IVF to a 63-year-old woman who
    is set to become Britain's oldest mother.

48
Doctor Severino Antinori
  • Severino Antinori says he only treated
    psychiatrist Patricia Rashbrook, of East Sussex,
    in an unnamed European country after strict
    medical checks.

49
The womans 4th child
  • Dr Rashbrook, who is seven months pregnant with
    her fourth child, said she was delighted with the
    pregnancy.
  • Dr Antinori said age 62 or 63 was the upper limit
    for IVF in healthy women.

50
Doctor Severino Antinori said
  • He said he would only consider couples with at
    least 20 years' life expectancy left for
    fertility treatment, but argued that older people
    made better parents.
  • He said Patricia and her husband John Farrant had
    come to him at his clinic in Rome, where he
    specializes in treating older women, three years
    ago and informed him about their wish to have a
    baby.

51
Doctor Severino Antinori said
  • "When the couple love each other they naturally
    want to have a baby.
  • "Age isn't important in this decision - what's
    important is the physical condition of the
    mother."

52
Animal Cloning
53
Dolly the Sheep
  • In 1997 Scientist in Scotland cloned the first
    mammal- Dolly the sheep. Not everyone was
    pleased.
  • In 2003 Dolly passed away from complications
    related to her cloning.

54
50,000 to clone your cat!
  • In 2002 scientist cloned the worlds first cat.
  • In 2004 a woman paid
  • 50,000
  • to have her dead cat cloned.

55
Researchers in South Korea
  • Employed cloned embryos in order to attain
    embryonic stem cells. Those embryos could have
    been implanted in a woman to create the first
    human clones. In other words the cloning
    technology already exist. The question is
    whether or not it should ever be used.

56
Hwang Woo-suk
  • Korean scientist, Hwang Woo-suk, the lead
    researcher in Koreas stem cell research has been
    accused of several ethical violations and has
    also been accused of falsifying research.

57
Want a job, give me your eggs
  • Hwang Woo-suk is accused of pressuring several
    female co workers into donating their ovum for
    research!

58
Send in the clones?
  • Dr Hwang stepped down as professor at Seoul
    National University (SNU) after an investigating
    panel said a key paper on custom stem cells was,
    in large part, fabricated.
  • Now, the panel has concluded that his landmark
    claim in 2004 to have produced the first stem
    cell line from a cloned human embryo was also
    false.

59
Benefits
  • Stem cells have the potential to cure a variety
    of diseases.
  • The dangers are few, the benefits are great.

60
Problems
  • Embryonic Stem cells destroy a 4-7 day old embryo
    that has the potential to become a human baby.
  • In some types of research eggs from women are
    needed. Should women be used in this way?
  • It trivializes life and the cost out weighs the
    risk.

61
Moral Questions
  • Should research be conducted on embryonic stem
    cells?
  • Are scientist using women when they donate their
    eggs for research? The procedure is extremely
    painful and serves no benefit to the women.
  • When does life begin?
  • Should any form of research be conducted of fetal
    tissue from abortions/ miscarriages?

62
Moral Questions Continued
  • Should people be allowed to clone themselves or
    their children?
  • Should we be able to choose the sex of a baby
    before it is born?
  • Should parents try to have another child in order
    to save the life of a living child?
About PowerShow.com