SYCE1 rs11204546: Understanding Genetic Links to Infertility
The rs11204546 variant is located within the SYCE1 gene, which encodes a protein essential for the structural integrity of the synaptonemal complex during meiosis. Research has linked certain mutations in this gene to non-obstructive azoospermia, a condition characterized by the absence of sperm in the ejaculate due to impaired spermatogenesis.
What each genotype means
Typical SYCE1 genotype
This is the most common genotype observed in the general population. It is considered the reference sequence for the SYCE1 gene, which plays a role in meiotic synapsis during sperm cell development.
This genotype is carried by the vast majority of the global population.
Heterozygous carrier status
You carry one copy of the variant allele and one copy of the reference allele. While SYCE1 variants are linked to non-obstructive azoospermia in a recessive inheritance pattern, carrying a single copy is generally not associated with clinical symptoms of infertility.
This genotype is rare, occurring in less than 4% of the global population based on a minor allele frequency of less than 0.02.
Potential increased risk
You carry two copies of the variant allele. Research indicates that bi-allelic (homozygous) variants in SYCE1 can lead to failure of synaptonemal complex assembly, which is associated with non-obstructive azoospermia and male infertility. Please discuss these findings with a reproductive specialist or genetic counselor to understand their clinical relevance to your health.
This genotype is extremely rare in the general population.
What is rs11204546?
The rs11204546 variant is a specific single nucleotide polymorphism (SNP) situated within the SYCE1 gene. In genomics, a SNP represents a variation at a single position in the DNA sequence among individuals. This particular variant is cataloged in public databases as part of the ongoing effort to map genetic architecture to human traits. While many SNPs are benign and have no observable effect on health, researchers study variants like rs11204546 to determine if they influence biological processes or contribute to disease susceptibility. Because this variant is located in a gene critical for reproductive development, it has become a subject of interest in studies investigating the genetic causes of male infertility. It is important to note that the presence of a specific SNP does not automatically imply a clinical condition, as genetic expression is complex and often involves multiple factors.
The Role of the SYCE1 Gene
The SYCE1 gene provides instructions for creating the synaptonemal complex central element protein 1. This protein is a vital component of the synaptonemal complex, a protein structure that forms between homologous chromosomes during meiosis—the specialized type of cell division that produces sperm and eggs. During this process, the synaptonemal complex acts like a zipper, holding chromosomes together to ensure they can exchange genetic material correctly. If SYCE1 is dysfunctional, the synaptonemal complex may fail to assemble or elongate properly. This failure can lead to meiotic arrest, where the cell division process stops prematurely, preventing the formation of mature, healthy sperm. Because of its essential role in meiosis, mutations in SYCE1 are recognized in scientific literature as potential contributors to spermatogenic failure and non-obstructive azoospermia.
Research and Evidence Strength
Current research into SYCE1 and its variants, including rs11204546, is primarily focused on its association with non-obstructive azoospermia. Studies have identified various pathogenic mutations in SYCE1 that disrupt its interaction with other proteins, such as SYCP1 or C14ORF39, leading to meiotic defects. However, the evidence linking the specific rs11204546 variant to clinical outcomes is considered limited. While the gene itself is well-documented as a cause of meiotic arrest in some cases, the functional impact of this specific SNP is not as clearly defined as other known pathogenic mutations. Scientific findings often highlight that infertility is a multifactorial condition, and genetic variants are only one piece of a much larger puzzle. Researchers continue to investigate how these variants interact with other genetic and environmental factors to influence reproductive health.
Population Frequency
The rs11204546 variant is relatively rare, with a minor allele frequency reported to be less than 0.02 globally. This low frequency suggests that the variant is not widespread across the general population. Because it is uncommon, large-scale studies are required to fully understand its distribution across different ancestral groups and its potential impact on health outcomes. Population databases like gnomAD are essential for providing this context, helping scientists distinguish between rare variants that may have clinical significance and the vast amount of benign variation found in every human genome.
Interpreting Genetic Information
It is important to understand that genetic information regarding variants like rs11204546 is for educational purposes and should not be used for self-diagnosis. The presence of a specific genotype does not guarantee a particular health outcome, as many factors—including other genes, lifestyle, and environment—contribute to fertility. If you have concerns about reproductive health or fertility, the most appropriate step is to consult with a qualified healthcare provider, such as a reproductive endocrinologist or a genetic counselor. These professionals can provide context based on your personal and family medical history, order appropriate clinical testing, and offer guidance tailored to your specific situation. Never make medical decisions based solely on information found in genetic databases or online articles.
How common is this variant?
The minor allele frequency for rs11204546 is less than 0.02 globally, indicating that the variant is rare across diverse ancestral populations.
Frequently asked questions
What is non-obstructive azoospermia?
Non-obstructive azoospermia is a condition where the testes are unable to produce sperm, or produce very few, due to issues with spermatogenesis. It is distinct from obstructive azoospermia, where sperm production is normal but the pathway is blocked.
Can I use this information to diagnose infertility?
No. Genetic variants are only one factor in fertility, and this information is for educational purposes only. A clinical diagnosis requires a comprehensive evaluation by a medical professional.
Is SYCE1 the only gene linked to azoospermia?
No, many genes are involved in spermatogenesis. Mutations in various genes, including SYCP1, SYCP3, and others, have been associated with meiotic arrest and infertility.
Where can I find more information about my own genetic data?
If you have had genetic testing, you should discuss your results with a genetic counselor or your doctor. They can help interpret your specific data in the context of your health history.
Sources & further reading
Educational information only, last refreshed 9/29/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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