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Aug 29, 2026, 16:50

Karthick Raj: What is Globozoospermia?

Karthick Raj, Junior Embryologist at Sugan Multispeciality Hospital and Sugan IVF and Fertility center shared a post on LinkedIn:

Topic: Globozoospermia (Experience in my lab in recent days)

Globozoospermia is a rare form of teratozoospermia in which spermatozoa have a round-headed appearance and lack a normal acrosome. Because the acrosome contains enzymes required for normal interaction with and penetration of the oocyte, fertilization can be severely impaired. It is also called round-headed sperm syndrome.The major problem occurs during spermiogenesis, particularly during formation and attachment of the acrosome to the sperm nucleus.

Normally:

Golgi apparatus – proacrosomal vesicles – acrosomal vesicle – acrosome spreads over anterior nucleus – nucleus elongates – mature sperm

In globozoospermia, this process is disturbed. Result: Abnormal acrosome formation – failure of nuclear elongation – round sperm head – abnormal sperm-oocyte interaction

Type I – Complete globozoospermia

Almost/all sperm have round heads.
Acrosome is absent.
Usually associated with severe fertilization problems.

Type II – Partial globozoospermia

Only a proportion of sperm are round-headed.
Other sperm may have varying degrees of head/acrosomal abnormalities.
Fertilization potential can be better than in complete globozoospermia, depending on the sperm population.

Normally, sperm undergo:

Capacitation – hyperactivation – binding to zona pellucida – acrosome reaction – interaction/penetration – oolemma fusion – oocyte activation

In globozoospermia, several steps can be impaired: absence of acrosome, Abnormal sperm-oocyte interaction, Poor oocyte activation, Abnormal sperm head structure

For an embryologist, the important workflow is:

Semen sample
Assess morphology
Identify round-headed sperm / suspected globozoospermia
Assess motility and vitality
ICSI usually preferred in severe cases
Careful assessment of oocyte activation
Check fertilization at appropriate time point
2PN + 2PB – normal fertilization

Key point to remember:

Globozoospermia is primarily a sperm-head/acrosome disorder, but its major clinical consequence is impaired fertilization.

Globozoospermia – round sperm head – absent/abnormal acrosome – impaired sperm–oocyte interaction + possible impaired oocyte activation – very low fertilization – ICSI commonly used.

Karthick Raj: What is Globozoospermia?