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Globozoospermia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Globozoospermia

Globozoospermia is a rare condition affecting males that results in infertility due to the production of abnormal, round-headed sperm cells that lack an acrosome.

Overview

Globozoospermia is a condition characterized by the production of sperm cells that have round heads rather than the normal oval shape. Crucially, these sperm lack an acrosome—a cap-like covering containing enzymes necessary to break down the outer membrane of an egg cell. Without this structure, the sperm cannot fertilize an egg, leading to male infertility.

Causes

The condition is most commonly caused by mutations in the DPY19L2 gene, which accounts for approximately 70 percent of cases. The DPY19L2 protein is vital for the development of the acrosome and the elongation of the sperm head during maturation. When this protein is missing or non-functional, the sperm fails to elongate and fails to form an acrosome, rendering the sperm unable to fertilize an egg.

Inheritance

Globozoospermia is inherited in an autosomal recessive pattern. This means that both copies of the gene in each cell must contain mutations for the condition to manifest. Parents of an individual with this condition each carry one copy of the mutated gene but typically do not show signs or symptoms of the disorder.

Frequently Asked Questions

Currently, no medication reliably restores the acrosome or normal head shape. General measures—maintaining a healthy weight, avoiding smoking, limiting alcohol, and reducing heat exposure to the testes—may improve overall semen parameters but do not correct the underlying genetic defect. Research into gene‑editing or protein‑replacement therapies is ongoing but not yet clinically available.
Diagnosis is made by a detailed semen analysis showing >80% round-headed sperm lacking an acrosome, followed by specialized staining (e.g., Papanicolaou or electron microscopy) to visualize the absent acrosome. Genetic confirmation is offered by sequencing the DPY19L2 gene (and occasionally other related genes) to identify pathogenic mutations.
Globozoospermia follows an autosomal recessive inheritance. If both you and your partner are carriers of a DPY19L2 mutation, each pregnancy has a 25% risk of an affected child, a 50% chance of a carrier, and a 25% chance of an unaffected non‑carrier. If your partner is not a carrier (confirmed by testing), the risk of an affected child is essentially zero, though carriers can be produced. Genetic counseling and carrier testing are recommended before conception.
Yes. Intracytoplasmic sperm injection (ICSI) combined with artificial oocyte activation (using calcium ionophore or electrical stimulation) bypasses the need for an acrosome and has reported pregnancy rates of 30‑50% in globozoospermic couples. Success depends on sperm quality, female partner’s age, and laboratory expertise.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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