Spermatid Injection Techniques in Male Infertility Treatment
Summary
Male infertility affects a significant proportion of couples worldwide, with non-obstructive azoospermia presenting one of the most challenging forms. Spermatid injection techniques—principally round spermatid injection (ROSI) and, to a lesser extent, elongating spermatid injection (ELSI)—offer a route to fertilisation when mature spermatozoa are absent. These approaches involve isolating immature haploid germ cells directly from the testis and microinjecting them into metaphase II oocytes. While ROSI circumvents the need for capacitated sperm, its success rates have historically been low owing to incomplete chromatin condensation, suboptimal epigenetic reprogramming and technical hurdles in cell handling. Advances in understanding oocyte cytoplasmic factors, refinements in micromanipulation protocols and adjunctive culture media have begun to improve developmental competence of injected oocytes. Comparative studies with intracytoplasmic sperm injection (ICSI) highlight both the promise and the persisting challenges of spermatid-based therapies. Ongoing work aims to enhance genomic integrity, ensure normal imprinting and establish standardised clinical guidelines, thus broadening the therapeutic repertoire for couples facing severe male factor infertility.
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Spermatid Injection Techniques in Male Infertility Treatment publication trend
The graph below shows the total number of articles in spermatid injection techniques in male infertility treatment across all publications each year (not limited to Nature Index journals).
Technical terms
Spermatid: A haploid male germ cell in the post-meiotic phase of spermatogenesis, preceding maturation into a spermatozoon.
Round spermatid injection (ROSI): A micromanipulation technique in which a round, immature spermatid is introduced directly into an oocyte to achieve fertilisation.
Elongating spermatid injection (ELSI): A variant of ROSI using more morphologically advanced spermatids with onset of chromatin condensation.
Germinal vesicle (GV) cytoplasm: The ooplasm of an immature oocyte, containing factors crucial for chromatin remodelling and epigenetic reprogramming.
Intracytoplasmic sperm injection (ICSI): A standard assisted reproduction technique wherein a single mature spermatozoon is injected into an oocyte.
DNA methylation: A covalent epigenetic modification involving addition of methyl groups to cytosine bases, critical for gene regulation and imprinting.
References
- Biallelic mutations in RNA-binding protein ADAD2 cause spermiogenic failure and non-obstructive azoospermia in humans. Human Reproduction Open (2023).
- Transcriptome and DNA Methylation Profiles of Mouse Fetus and Placenta Generated by Round Spermatid Injection. Frontiers in Cell and Developmental Biology (2021).
- Reprogramming of Round Spermatids by the Germinal Vesicle Cytoplasm in Mice. PLOS ONE (2013).
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