rs34276300: Understanding Your Y-Chromosome Paternal Lineage
The variant rs34276300 is a single-nucleotide polymorphism located on the human Y chromosome. It serves as a diagnostic genetic marker used by researchers to identify the R1b1b2a1a2 haplogroup and trace paternal lineages.
What each genotype means
R1b1b2a1a2 paternal lineage
This genotype is a diagnostic marker for the Y-chromosome haplogroup R1b1b2a1a2. It represents a derived state used by geneticists to trace specific paternal lineages in human populations.
This genotype is found in males belonging to the specific R1b1b2a1a2 haplogroup, which is a subset of the broader R1b lineage.
Ancestral paternal lineage
This genotype represents the ancestral state for this specific Y-chromosome marker. It is commonly observed in individuals who do not carry the derived A allele associated with the R1b1b2a1a2 haplogroup.
This is the ancestral allele and is common in many populations, appearing frequently in standard microarray genotyping data.
What is rs34276300?
The variant rs34276300 is a specific Y-chromosome single-nucleotide polymorphism (SNP). In genetics, a SNP represents a variation at a single position in a DNA sequence. Because the Y chromosome is passed exclusively from father to son, Y-SNPs like rs34276300 are highly stable markers that do not undergo the same recombination processes as other chromosomes. This stability makes them powerful tools for scientists and genealogists to map human migration patterns and define paternal haplogroups. Located at position 19,995,425 on the Y chromosome (GRCh38 assembly), this variant is categorized as an ancestral marker. It is frequently utilized in commercial and academic genetic testing to help individuals determine their specific branch on the human Y-chromosome phylogenetic tree.
The Role of Y-Chromosome Markers
Unlike autosomes, which are inherited from both parents, the Y chromosome is inherited only by biological males from their fathers. This unique inheritance pattern allows researchers to trace a direct, unbroken paternal line back through many generations. Y-SNPs are essentially 'mutations' that occurred in the distant past and were passed down to all male descendants of the individual in whom the mutation first appeared. By identifying which SNPs a person carries, researchers can assign them to a specific haplogroup—a group of people who share a common paternal ancestor. rs34276300 is specifically associated with the R1b1b2a1a2 haplogroup. These markers do not typically code for proteins or influence physical health traits; rather, they act as historical signposts that help reconstruct the demographic history and expansion of human populations over thousands of years.
Research and Evidence
The evidence supporting the use of rs34276300 as a diagnostic marker for the R1b1b2a1a2 haplogroup is considered moderate within the field of genetic genealogy. It is widely recognized in databases such as SNPedia and is included in various commercial genotyping arrays, including those from 23andMe and Ancestry. Research involving this SNP focuses primarily on population genetics and phylogenetics rather than clinical health outcomes. Because it is an intergenic variant—meaning it sits in a region of the DNA that does not code for a gene—it is not associated with any known medical conditions or disease risks. The scientific utility of this variant is strictly limited to ancestry and lineage tracing. It is important to note that while these markers are accurate for identifying haplogroups, they provide no information regarding an individual's health, disease susceptibility, or physical characteristics.
Interpreting Your Results
If you have received results for rs34276300, you are likely looking at information regarding your paternal ancestry. A result of 'A' indicates the derived allele, which is associated with the R1b1b2a1a2 haplogroup, while a 'C' indicates the ancestral allele. Because this is a Y-chromosome marker, biological males will typically have only one copy of this SNP. This information is intended for genealogical exploration and personal interest. It cannot be used to diagnose medical conditions, predict health outcomes, or determine responses to medications. If you are interested in your health-related genetic information, you should consult with a qualified healthcare provider or a genetic counselor who can interpret clinical data in the context of your personal and family medical history. Genetic genealogy results are for informational purposes and should not be used to make medical decisions.
How common is this variant?
The Global Minor Allele Frequency (GMAF) for rs34276300 is approximately 0.1864, reflecting its distribution across specific paternal lineages.
Frequently asked questions
Is rs34276300 associated with any diseases?
No. rs34276300 is an intergenic Y-chromosome marker used exclusively for tracing paternal ancestry and has no known association with medical conditions or health traits.
Can women have a result for rs34276300?
Because rs34276300 is located on the Y chromosome, it is only present in biological males. Women do not carry a Y chromosome and therefore do not have a genotype for this variant.
What does it mean if I am R1b1b2a1a2?
Being part of the R1b1b2a1a2 haplogroup means you share a common paternal ancestor with others who carry this specific genetic marker. It is a way to categorize your deep paternal ancestry.
Why do my results show different alleles than others?
Genetic variation is common. Different alleles simply indicate that your paternal line belongs to a different branch of the human family tree compared to those with a different result.
Sources & further reading
Educational information only, last refreshed 9/17/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This Y-chromosomal SNP is a marker for haplogroup R, specifically associated with the R1b subclade, which is prevalent in Western European populations.
This Y-chromosomal SNP is a marker used to distinguish specific paternal ancestral lineages.
A high-confidence Y-chromosome SNP used for refining the human Y-chromosome phylogenetic tree.
This Y-chromosome variant serves as a marker for specific ancestral clades identified in large-scale phylogenetic studies.
This Y-chromosomal SNP is a marker associated with Y-DNA haplogroup R1b.
Y-chromosomal SNP marker used in phylogenetic studies of human male lineages.