Echinoid Extract Induces Sea Cucumber Oocyte Maturation
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Solution Overview
Problem
Current methods for inducing oocyte maturation in sea cucumbers are unreliable and result in low fertilization rates and abnormal larvae, making it difficult to produce large quantities of viable eggs for sea cucumber farming.
Innovation Solution
The use of an echinoid extract, specifically a protein fraction isolated from echinoid gonads, is employed to induce oocyte maturation in sea cucumbers, allowing for the production of mature and fertilizable eggs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal shocks are used to induce gamete emission in sea cucumbers, then some individuals can emit gametes, but the method is not reliable and results vary greatly according to protocol, species, or progenitor
Solution Approach 1:
The patent introduces an intermediary substance (MIS - maturation inducing substance) that mediates between the external environment and the oocyte maturation process. This MIS is derived from echinoid gonads and acts as a universal inducer that can reliably trigger oocyte maturation across different sea cucumber species, eliminating the need for species-specific thermal shock protocols and achieving consistent results regardless of progenitor variations.
2Quantity of substance
If oocytes are taken from ovaries by dissection of mature females, then oocytes can be obtained, but oogenesis is blocked at prophase stage and cannot be fertilized
Solution Approach 1:
The patent applies preliminary action by using MIS to induce oocyte maturation before the natural spawning event. This preliminary induction of maturation (completing meiosis and forming mature oocytes) allows the oocytes to be fertilized immediately after extraction, transforming them from unfertilizable prophase-stage oocytes into fertile, fertilizable eggs, thereby enabling unlimited quantity production of viable larvae.
3Reliability
If molecules such as 1-methyladenine, DTT, DMP, or L-cysteine are used to induce oocyte maturation, then maturation can occur, but the rate is very low or the oocytes produce abnormal larvae
Solution Approach 1:
The patent changes the fundamental parameter of the maturation inducer from synthetic chemical compounds (1-methyladenine, DTT, DMP, L-cysteine) to a natural biological extract (MIS from echinoid gonads). This parameter change results in superior performance: achieving high maturation rates (over 90%) while producing normal, viable larvae instead of abnormal ones, as the natural MIS preserves the physiological integrity of the oocyte maturation process.
Data Source
Figure 1
AI summary
The present invention relates to a method for the maturation of marine invertebrate oocytes of economic interest, characterized in that one or more oocytes of said invertebrates are brought into contact with an effective amount of an echinoderm extract in such a way as to obtain mature oocytes.