AURKC rs1057519948: Understanding Macrozoospermia and Infertility
The AURKC variant rs1057519948 is a genetic change in the aurora kinase C gene associated with macrozoospermia, a condition characterized by large-headed, polyploid sperm. This variant is linked to primary male factor infertility due to the disruption of normal sperm cell division during meiosis.
What each genotype means
Typical AURKC function
This genotype represents the common, functional version of the AURKC gene. Individuals with this profile produce normal aurora kinase C protein, which is essential for proper cell division during sperm development.
This is the most common genotype observed globally across all ancestral populations.
Carrier of loss-of-function variant
This genotype indicates you carry one copy of the c.144delC mutation, which is a known loss-of-function variant in the AURKC gene. Research indicates that carriers of a single copy typically do not exhibit the macrozoospermia phenotype, as the remaining functional copy is generally sufficient for normal sperm development.
This genotype is found at an elevated frequency in populations of North African ancestry compared to other global populations.
Associated with macrozoospermia
This genotype involves two copies of the c.144delC mutation, leading to the production of nonfunctional aurora kinase C protein. This condition is strongly associated with macrozoospermia, a form of male infertility characterized by large-headed, polyploid, and multiflagellar sperm that are typically unable to fertilize an egg.
This genotype is rare globally but has been identified as a frequent cause of macrozoospermia in men of North African descent.
What is the rs1057519948 Variant?
The variant rs1057519948 is a specific genetic alteration located within the AURKC gene. In the context of human genomics, this variant is categorized as a loss-of-function mutation. When an individual carries this variant, it can interfere with the production of the aurora kinase C protein, which is essential for the proper development of sperm cells. This variant is part of a group of mutations in the AURKC gene that have been identified in clinical studies of men experiencing severe fertility challenges. Because it is a rare variant, it is not typically included in standard, broad-spectrum genetic screening panels. Its identification usually occurs during targeted molecular diagnostic testing for men who present with specific sperm morphology abnormalities, such as macrozoospermia, where sperm cells appear larger than normal and contain extra sets of chromosomes.
The Role of the AURKC Gene
The AURKC gene provides the biological instructions for creating the aurora kinase C protein. This protein is highly expressed in the testes, the organs responsible for producing and storing sperm. During the process of spermatogenesis, cells must undergo a specialized type of cell division called meiosis to reduce their chromosome count by half, ensuring that each sperm cell contains only one set of chromosomes. Aurora kinase C acts as a critical regulator during this division process. When the gene is functioning correctly, it ensures that chromosomes are accurately separated into new sperm cells. If the gene is mutated and the resulting protein is non-functional or absent, the cell division process is blocked. This failure leads to the production of spermatozoa that are tetraploid, meaning they contain double the normal amount of DNA, which prevents them from successfully fertilizing an egg.
Research and Clinical Associations
Research into AURKC mutations, including rs1057519948, has established a strong link between these genetic defects and primary male infertility. Studies have shown that men who are homozygous for loss-of-function mutations in this gene consistently produce large-headed, multi-flagellar spermatozoa. The evidence for this association is considered robust in the context of clinical reproductive medicine, particularly for patients presenting with the specific phenotype of macrozoospermia. However, it is important to note that while the association with the phenotype is clear, the overall prevalence of this specific variant is limited. Clinical guidelines suggest that when macrozoospermia is observed, molecular analysis of the AURKC gene is a recommended diagnostic step. Because these mutations result in chromosomally abnormal sperm, clinicians often advise that standard assisted reproductive techniques, such as intracytoplasmic sperm injection (ICSI), may not be effective for these patients.
Population Frequency and Distribution
The rs1057519948 variant is considered rare on a global scale. However, research has indicated that mutations in the AURKC gene are more frequently observed in populations of North African ancestry. In some studies, the carrier frequency for pathogenic AURKC mutations in the Maghrebian population has been estimated at approximately 1 in 50. This elevated frequency suggests a founder effect in these regions. Outside of North Africa, the prevalence of this specific variant is largely unknown, though it has been identified in individuals of European descent. The disparity in frequency highlights the importance of considering ancestral background when evaluating genetic causes of infertility. Because the condition is inherited in an autosomal recessive manner, an individual must typically inherit two copies of a pathogenic mutation to manifest the macrozoospermia phenotype.
Navigating Genetic Information
If you or a partner are concerned about fertility, it is essential to consult with a reproductive endocrinologist or a genetic counselor. Genetic information regarding variants like rs1057519948 is complex and should only be interpreted within the context of a clinical evaluation, including a semen analysis and, if necessary, targeted genetic testing. You cannot diagnose yourself or determine your fertility status based on a genetic report alone. If a genetic variant is identified, a healthcare provider can help explain what it means for your reproductive health and discuss potential options or further testing. Avoid making medical decisions based on raw genetic data without professional guidance. Genetic testing for infertility is a specialized field, and clinicians are best equipped to integrate these findings into a comprehensive care plan tailored to your specific medical history and reproductive goals.
How common is this variant?
The variant is rare globally but shows an elevated frequency in North African populations, where carrier rates for pathogenic AURKC mutations have been estimated at approximately 1 in 50.
Frequently asked questions
Can AURKC mutations be treated?
Currently, there is no medical treatment to correct the underlying genetic defect in the AURKC gene. Because the mutation leads to the production of chromosomally abnormal sperm, standard fertility treatments like ICSI are often ineffective.
Is macrozoospermia hereditary?
Yes, macrozoospermia caused by AURKC mutations is inherited in an autosomal recessive pattern. This means an affected individual typically inherits one copy of the mutation from each parent, who are usually asymptomatic carriers.
Should I get tested for AURKC variants?
Genetic testing for AURKC is generally recommended only for men who have been diagnosed with macrozoospermia through a semen analysis. You should discuss the necessity of this testing with a reproductive specialist.
Does this variant affect female fertility?
Research indicates that AURKC is not essential for oogenesis. Studies have identified fertile women who are homozygous for AURKC mutations, suggesting the gene's primary role is specific to male spermatogenesis.
Sources & further reading
Educational information only, last refreshed 10/17/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Recessive nonsense variant causing macrozoospermia, polyploidy, 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.