Polar Body Injection for Ethical Stem Cell Production

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Solution Overview

Problem

Current methods for stem cell production raise ethical concerns due to the use of embryos and embryonic stem cells, necessitating the development of alternative methods that do not involve initiating the process of organism development.

Innovation Solution

A method involving the removal of a polar body from one egg cell and its injection into another fertile egg cell, which is then cultured to form a blastocyst and isolate stem cells, avoiding the use of fertilized eggs, male reproductive cells, or chromosomes of male origin, thereby achieving unimaternal disomy that is not viable for organism development.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional methods are used to obtain stem cells, then stem cells can be produced, but ethical concerns arise due to the use of embryos and embryonic stem cells

Engineering Contradiction:

Improveethical acceptabilityVSAvoidstem cell production validity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention extracts the polar body (containing haploid chromosomes) from the egg cell and injects it into a second egg cell that has had its polar body removed. This creates a diploid cell with unimaternal disomy without requiring fertilization by male sperm, thereby eliminating the ethical concerns associated with embryo destruction while still producing viable stem cells.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of the conventional approach where male sperm fertilizes the egg to create a zygote, the invention inverts the process by using the egg cell's own polar body (which would normally be discarded) to restore diploidy. This reverse approach achieves stem cell production without male genetic contribution and without creating a viable embryo.

Inventive Principle:

Principle #13The other way round (Inversion)

2Stability of the object's composition

If polar bodies are not removed from egg cells, then the egg cells remain in their natural state, but they can be ejected during meiosis II

Engineering Contradiction:

Improveegg cell integrityVSAvoidstem cell production control

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention performs preliminary removal of the polar body from the egg cell before the natural ejection process during meiosis II occurs. This proactive removal allows controlled extraction and subsequent injection into a second egg cell, providing precise control over the stem cell production process rather than relying on natural ejection.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If fertilized eggs are used for stem cell production, then development can be initiated, but this raises ethical concerns about creating and destroying embryos

Engineering Contradiction:

Improvestem cell viabilityVSAvoidethical acceptability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention converts the normally discarded polar body (which would be wasted) into a valuable resource by injecting it into a second egg cell. This transforms what was considered waste material into the key component for generating ethically acceptable stem cells with unimaternal disomy, eliminating the need to create and destroy fertilized embryos.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Adaptability or versatility

If male reproductive cells are used for fertilization, then genetic diversity is achieved, but this prevents unimaternal disomy that is not viable for organism development

Engineering Contradiction:

Improvegenetic diversityVSAvoidethical acceptability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The invention extracts and removes the male sperm cell from the fertilization process entirely. Instead, it uses the egg cell's own polar body to provide the second set of chromosomes, creating unimaternal disomy. This extraction of male genetic material eliminates the possibility of viable embryo development while still producing stem cells for research and medical applications.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11214770B2Polar body injection

Publication Date: 2022.01.04 WURFEL WOLFGANG

AI summary

The invention relates to a method for polar body injection, which comprises removing a polar body from a first egg cell and injecting the polar body into a second egg cell that is in a fertilizable state.