Sperm Separation via Anti-CD46 Antibody Binding
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Solution Overview
Problem
Current methods for improving sperm quality in assisted reproduction are limited in effectively separating sperm with undamaged intact heads from damaged heads and somatic cells, which is crucial for enhancing fertilization success rates.
Innovation Solution
A method utilizing anti-CD46 antibodies or CD46-binding ligands to selectively bind and remove sperm with damaged heads and somatic cells from a sample, exploiting the fact that undamaged sperm lack surface-bound CD46, allowing for the separation of healthy sperm for use in assisted reproduction techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods using insoluble carriers with antibodies against sperm membrane indicators are used, then some separation of healthy sperm is achieved, but the separation efficiency and purity are limited (only ~20% increase in motility)
Solution Approach 1:
The invention extracts and utilizes the specific biological marker CD46 that is differentially expressed between healthy and damaged sperm. By targeting CD46 with antibodies or ligands, the method selectively binds to and removes damaged sperm and somatic cells, achieving more precise separation than conventional methods that use general membrane integrity indicators.
Solution Approach 2:
The invention changes the selection parameter from general membrane integrity indicators to the specific CD46 marker expression level. Since CD46 is minimally expressed on healthy sperm heads but highly expressed on damaged sperm and somatic cells, this parameter change enables more accurate discrimination and separation of healthy sperm from damaged cells.
2Manufacturing precision
If CD46-targeting antibodies or ligands are used to selectively bind damaged sperm and somatic cells, then separation precision is significantly improved, but the method complexity increases
Solution Approach 1:
The invention uses antibodies or ligands against CD46 as intermediary agents that mediate the separation process. These intermediaries specifically bind to CD46 on damaged sperm and somatic cells, enabling selective attachment to insoluble carriers and subsequent removal, while leaving healthy sperm unaffected.
Solution Approach 2:
The method extracts and isolates healthy sperm by removing the CD46-positive components (damaged sperm and somatic cells) through antibody-mediated binding to insoluble carriers, achieving high-purity sperm separation despite the added complexity of using specific antibodies.
3Reliability
If existing methods with commercially available beads are used, then some improvement in sperm motility ratio is achieved, but the fertilization success rate enhancement is limited
Solution Approach 1:
The invention changes the quality improvement parameter from general motility enhancement to specific separation based on CD46 marker expression. This parameter change targets the root cause of fertilization failure (presence of damaged sperm and somatic cells) rather than just improving motility, thereby significantly enhancing fertilization success rates.
Solution Approach 2:
The method uses insoluble carriers (beads) that can be separated from the sperm sample through centrifugation or filtration, enabling efficient removal of CD46-positive damaged sperm and somatic cells while retaining healthy sperm in the supernatant or filtrate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly increases the percentage of sperm with undamaged intact heads, improving sperm quality and fertilization success by removing damaged sperm and somatic cells, thereby enhancing the efficacy of assisted reproduction procedures.
Implementation Method 1
contacting the sperm sample with the anti-CD46 antibody and/or the CD46-binding ligand bound to the carrier and/or to the tag in order to bind CD46 presenting cells and/or cell debris from the sperm sample to the anti-CD46 antibody and/or to the CD46-binding ligand
Data Source
AI summary
A method of separation of sperm cells with undamaged intact heads from sperm cells with damaged heads and/or somatic cells and/or cell debris in a sperm sample obtained from a human, comprising the steps of:providing an anti-CD46 antibody or CD46-binding ligand bound to a carrier and/or to a tag;contacting the sperm sample with the anti-CD46 antibody or CD46 -binding ligand bound to the carrier and/or to the tag in order to bind CD46 presenting cells and/or cell debris from the sperm sample to the anti-CD46 antibody or CD46-binding ligand;removing the CD46 presenting cells bound via the anti-CD46 antibody or CD46 -binding ligand to the carrier and/or to the tag to obtain a sperm sample free of CD46 presenting cells, wherein CD46 presenting cells include sperm cells with damaged heads, somatic cells and cell debris, is disclosed.