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what is a pluripotent stem cell?
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thomas.rhett
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#1
Can someone please explain why C and not B is the answer to the attached MCQ?
According to my textbook RBC are produced from haematopoietic stem cells in bone marrow which are multipotent.
In previous edexcel mark schemes they define pluripotent stem cells as cells that can give rise to "many" / "most" cell types. This question uses the word "some".
Thanks a lot.
According to my textbook RBC are produced from haematopoietic stem cells in bone marrow which are multipotent.
In previous edexcel mark schemes they define pluripotent stem cells as cells that can give rise to "many" / "most" cell types. This question uses the word "some".
Thanks a lot.
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Reality Check
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#2
(Original post by thomas.rhett)
Can someone please explain why C and not B is the answer to the attached MCQ?
According to my textbook RBC are produced from haematopoietic stem cells in bone marrow which are multipotent.
In previous edexcel mark schemes they define pluripotent stem cells as cells that can give rise to "many" / "most" cell types. This question uses the word "some".
Thanks a lot.
Can someone please explain why C and not B is the answer to the attached MCQ?
According to my textbook RBC are produced from haematopoietic stem cells in bone marrow which are multipotent.
In previous edexcel mark schemes they define pluripotent stem cells as cells that can give rise to "many" / "most" cell types. This question uses the word "some".
Thanks a lot.
I think the error is in the wording of the question: it should be 'Red blood cells are produced from multipotent stem cells found in bone marrow'. The answer then is 'C', which is correct.
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Jpw1097
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#3
(Original post by thomas.rhett)
Can someone please explain why C and not B is the answer to the attached MCQ?
According to my textbook RBC are produced from haematopoietic stem cells in bone marrow which are multipotent.
In previous edexcel mark schemes they define pluripotent stem cells as cells that can give rise to "many" / "most" cell types. This question uses the word "some".
Thanks a lot.
Can someone please explain why C and not B is the answer to the attached MCQ?
According to my textbook RBC are produced from haematopoietic stem cells in bone marrow which are multipotent.
In previous edexcel mark schemes they define pluripotent stem cells as cells that can give rise to "many" / "most" cell types. This question uses the word "some".
Thanks a lot.
So in the list of options you have, A refers to totipotent, B refers to pluripotent, C to multipotent and D would be some erythroid progenitor.
Last edited by Jpw1097; 5 months ago
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thomas.rhett
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#4
Thank you both very much for your responses.
The question below is also from edexcel IAL (2017) but refers to stem cells in bone marrow as "pluripotent" but it doesn't refer specifically to hematopoietic stem cells.
I don't understand why it is wrong to say bone marrow cells are pluripotent because they can give rise to all cell types except cell types in extra-embryonic tissues.
Q/ Suggest why the stem cells in the bone marrow are considered to be pluripotent:
ANS: they can form many cell types
DO NOT ACCEPT ‘all cells types except {embryonic cells / embryonic-supporting cells / extra embryonic cells / totipotent cells}’
Examiner’s comments: Candidates have clearly been taught a definition of pluripotency in the context of the blastocyst but clearly do not realize there are pluripotent cells anywhere other than in the blastocyst. When you see the command word 'suggest' you must apply your knowledge to the context of the question and not just recall what you have been taught.
The question below is also from edexcel IAL (2017) but refers to stem cells in bone marrow as "pluripotent" but it doesn't refer specifically to hematopoietic stem cells.
I don't understand why it is wrong to say bone marrow cells are pluripotent because they can give rise to all cell types except cell types in extra-embryonic tissues.
Q/ Suggest why the stem cells in the bone marrow are considered to be pluripotent:
ANS: they can form many cell types
DO NOT ACCEPT ‘all cells types except {embryonic cells / embryonic-supporting cells / extra embryonic cells / totipotent cells}’
Examiner’s comments: Candidates have clearly been taught a definition of pluripotency in the context of the blastocyst but clearly do not realize there are pluripotent cells anywhere other than in the blastocyst. When you see the command word 'suggest' you must apply your knowledge to the context of the question and not just recall what you have been taught.
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Reality Check
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#5
(Original post by thomas.rhett)
Thank you both very much for your responses.
The question below is also from edexcel IAL (2017) but refers to stem cells in bone marrow as "pluripotent" but it doesn't refer specifically to hematopoietic stem cells.
I don't understand why it is wrong to say bone marrow cells are pluripotent because they can give rise to all cell types except cell types in extra-embryonic tissues.
Q/ Suggest why the stem cells in the bone marrow are considered to be pluripotent:
ANS: they can form many cell types
DO NOT ACCEPT ‘all cells types except {embryonic cells / embryonic-supporting cells / extra embryonic cells / totipotent cells}’
Examiner’s comments: Candidates have clearly been taught a definition of pluripotency in the context of the blastocyst but clearly do not realize there are pluripotent cells anywhere other than in the blastocyst. When you see the command word 'suggest' you must apply your knowledge to the context of the question and not just recall what you have been taught.
Thank you both very much for your responses.
The question below is also from edexcel IAL (2017) but refers to stem cells in bone marrow as "pluripotent" but it doesn't refer specifically to hematopoietic stem cells.
I don't understand why it is wrong to say bone marrow cells are pluripotent because they can give rise to all cell types except cell types in extra-embryonic tissues.
Q/ Suggest why the stem cells in the bone marrow are considered to be pluripotent:
ANS: they can form many cell types
DO NOT ACCEPT ‘all cells types except {embryonic cells / embryonic-supporting cells / extra embryonic cells / totipotent cells}’
Examiner’s comments: Candidates have clearly been taught a definition of pluripotency in the context of the blastocyst but clearly do not realize there are pluripotent cells anywhere other than in the blastocyst. When you see the command word 'suggest' you must apply your knowledge to the context of the question and not just recall what you have been taught.
I certainly thought that a HSC was multipotent, rather than pluripotent, so this is learning for me. Jpw1097 - every day is a schoolday on TSR, it seems
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Jpw1097
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(Original post by Reality Check)
I've done a bit more reading on this, and yes - HSCs are defined as pluripotent. This, from Cell Death Discovery (Nature Publishing) [Ng, A., Alexander, W. Haematopoietic stem cells: past, present and future. Cell Death Discov. 3, 17002 (2017). ]https://doi.org/10.1038/cddiscovery.2017.2]
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I certainly thought that a HSC was multipotent, rather than pluripotent, so this is learning for me. Jpw1097 - every day is a schoolday on TSR, it seems
I've done a bit more reading on this, and yes - HSCs are defined as pluripotent. This, from Cell Death Discovery (Nature Publishing) [Ng, A., Alexander, W. Haematopoietic stem cells: past, present and future. Cell Death Discov. 3, 17002 (2017). ]https://doi.org/10.1038/cddiscovery.2017.2]
I certainly thought that a HSC was multipotent, rather than pluripotent, so this is learning for me. Jpw1097 - every day is a schoolday on TSR, it seems
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Reality Check
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(Original post by Jpw1097)
I always thought HSCs were the classic example of multipotent stem cells, but yes it seems that they are now considered pluripotent. Thanks for the update!
I always thought HSCs were the classic example of multipotent stem cells, but yes it seems that they are now considered pluripotent. Thanks for the update!
As I say, it was news to me, too!
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thomas.rhett
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#8
Last edited by thomas.rhett; 5 months ago
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