AURKC rs77414211: Understanding Macrozoospermia and Infertility
The rs77414211 variant is a genetic alteration located within the AURKC gene, which is essential for proper sperm development. It is associated with macrozoospermia, a condition characterized by large-headed, polyploid sperm that can lead to primary male factor infertility.
What each genotype means
Typical sperm morphology
You carry two copies of the common functional allele for the AURKC gene. This genotype is not associated with macrozoospermia or AURKC-related male infertility. Your AURKC gene expression and meiosis regulation function normally based on current genetic findings.
Found in over 97% of individuals in North African populations and exceeds 99.9% across other worldwide ancestries.
Macrozoospermia carrier
You carry one copy of the nonsense variant in the AURKC gene. Macrozoospermia and associated polyploid male infertility follow an autosomal recessive pattern, meaning carriers of a single altered copy typically have normal sperm development and normal fertility. However, there is a chance of passing this variant to biological offspring.
Carried by approximately 1% to 3% of individuals of North African ancestry, but is extremely rare in most other global populations.
Macrozoospermia risk
You carry two copies of the loss-of-function nonsense variant in the AURKC gene. In males, homozygosity for this variant is strongly associated with macrozoospermia, characterized by large-headed, multiflagellar, and polyploid spermatozoa resulting in primary infertility. If you have concerns regarding fertility or family planning, discussing these results with a reproductive specialist or genetic counselor is recommended.
Estimated to affect roughly 1 in 10,000 males in North African populations, while being exceedingly rare in other ancestries.
What is the rs77414211 Variant?
The rs77414211 variant is a specific change in the DNA sequence of the AURKC gene, which is situated on the long arm of chromosome 19 at position 19q13.43. In genetics, a variant like this represents a difference in the nucleotide sequence compared to the most common version found in the general population. This particular variant is classified as a nonsense mutation, meaning it introduces a premature stop signal during the process of protein synthesis. When this occurs, the cell's machinery stops reading the genetic instructions too early, often resulting in a protein that is either incomplete, nonfunctional, or unstable. Because this gene is critical for the complex process of cell division during sperm production, alterations here can have significant impacts on reproductive health.
The Role of the AURKC Gene
The AURKC gene provides the blueprint for producing a protein known as Aurora Kinase C. This protein is highly expressed in the testes, where it plays a vital role in meiosis, the specialized type of cell division that creates sperm cells. Specifically, Aurora Kinase C helps ensure that chromosomes are correctly separated and distributed into developing sperm. When the AURKC gene is mutated, the resulting protein may be unable to perform its function, leading to errors in cell division. This often results in the production of spermatozoa that are macrocephalic (large-headed) and multiflagellar (having multiple tails). These abnormal sperm cells are typically polyploid, meaning they contain extra sets of chromosomes, which prevents them from successfully fertilizing an egg and leads to primary male factor infertility.
Research and Clinical Associations
Scientific research has established a clear link between homozygous mutations in the AURKC gene and macrozoospermia syndrome. Studies have shown that men who inherit two copies of a pathogenic AURKC variant—one from each parent—are at a high risk of infertility due to the production of abnormal sperm. While the most widely studied mutation in this gene is c.144delC, other variants like rs77414211 are investigated for their similar impact on protein function. The evidence for these variants as a cause of male infertility is considered strong in the context of clinical genetics, particularly for men presenting with specific sperm morphology issues. However, because these conditions are rare, ongoing research continues to refine our understanding of how different variants across the AURKC gene contribute to the spectrum of male reproductive health.
Population Frequency and Distribution
The prevalence of pathogenic AURKC variants is not uniform across the globe. Research indicates that certain mutations in this gene are significantly enriched as founder alleles within North African populations, including in Morocco and Algeria. In these regions, the carrier frequency is notably higher than in other parts of the world, where such variants are considered rare. This distribution pattern is often attributed to founder effects, where a specific genetic trait becomes more common in a population due to the limited genetic diversity of the group's ancestors. Outside of these specific populations, the occurrence of these variants is much lower. Understanding these ancestry-specific patterns is important for genetic counseling and for clinicians evaluating the potential genetic causes of male infertility in different patient populations.
Navigating Genetic Information
If you have received information about your genetic status regarding the AURKC gene, it is important to interpret these results within a clinical context. Genetic variants do not act in isolation, and the presence of a variant does not automatically guarantee a specific health outcome. For individuals concerned about fertility, the most appropriate step is to consult with a reproductive endocrinologist, a urologist specializing in male infertility, or a certified genetic counselor. These professionals can provide a comprehensive evaluation, including semen analysis and, if necessary, clinical genetic testing. Never use genetic data to self-diagnose or make medical decisions without professional guidance. A clinician can help you understand the implications of your results, discuss potential reproductive options, and provide support tailored to your specific health history and family planning goals.
How common is this variant?
The variant is enriched as a founder allele in North African populations with a minor allele frequency up to approximately 0.015, while remaining rare in other global populations.
Frequently asked questions
What is macrozoospermia?
Macrozoospermia is a rare condition where sperm cells have abnormally large heads and often multiple tails. These sperm are typically polyploid, meaning they have an incorrect number of chromosomes, which makes them unable to fertilize an egg.
Does having an AURKC variant mean I am infertile?
Not necessarily. Many variants are recessive, meaning they only cause issues if you inherit two copies of the mutation. You should consult a fertility specialist to understand your specific results and reproductive health.
Is there a treatment for AURKC-related infertility?
Currently, there is no direct treatment to correct the genetic function of the AURKC gene. Couples facing infertility due to this condition often explore assisted reproductive technologies, which should be discussed with a fertility specialist.
Should I get tested for this variant?
Genetic testing for AURKC is typically recommended by specialists for men who have been diagnosed with macrozoospermia or unexplained primary infertility. It is not a routine test for the general population.
Sources & further reading
Educational information only, last refreshed 10/13/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Loss-of-function variation in aurora kinase C causing macrozoospermia, polyploidy in spermatozoa, and primary male factor infertility.
Pathogenic variant in AURKC causing complete failure of meiotic division during spermatogenesis, leading to large-headed multiflagellar spermatozoa and primary male infertility.
A nonsense mutation in AURKC causing macrozoospermia and male infertility.