DDX3Y rs2032624: Defining Haplogroup R1 and Paternal Lineages
rs2032624, historically designated M173 or P241, is a well-established single nucleotide polymorphism located on the non-recombining region of the human Y chromosome within the DDX3Y gene. Rather than acting as a disease-causing risk factor, this variant serves as an essential phylogenetic marker in population genetics that defines human paternal Haplogroup R1. Its presence traces ancient patrilineal migration patterns, particularly characterizing major paternal lineages across Europe and Western Eurasia.
What each genotype means
Ancestral Y-chromosome lineage
This genotype represents the ancestral state of the rs2032624 marker on the Y chromosome. It indicates that you do not carry the M173 mutation that defines the R1 haplogroup, placing your paternal lineage outside of this specific clade.
This genotype is common in many global populations but is absent in lineages defined by the R1 haplogroup.
Haplogroup R1 paternal lineage
This genotype indicates the presence of the derived C allele, also known as M173 or P241, which is a defining phylogenetic marker for human paternal haplogroup R1. This haplogroup is widely distributed across West Eurasian and European male lineages.
This genotype is found at substantial frequencies across European and West Eurasian male populations and is rare or absent in sub-Saharan African lineages.
Heterozygous Y-chromosome marker
Because this variant is located on the Y chromosome, which is typically present as a single copy in males, a heterozygous result is generally not expected in a standard biological sample. If you see this result, it may indicate a technical artifact, a sample quality issue, or a rare structural variation; you may wish to consult with a genetic counselor or the testing laboratory.
This genotype is not a standard biological state for this Y-chromosomal marker and is not expected in typical population data.
Genetic Identity and Genomic Location
The genetic variant rs2032624 represents a biallelic single nucleotide substitution (often annotated as an A to C transversion in derived lineages) situated at position 12,914,512 on the Y chromosome (GRCh38 assembly). Because it resides on the male-specific region of chromosome Y (MSY), rs2032624 is inherited in a strictly patrilineal manner from father to biological son without undergoing meiotic recombination. In the classical nomenclature of molecular anthropology and population genetics, this variant is widely recognized under the lineage-defining labels M173 and P241. Because chromosome Y is hemizygous in biological males, individuals carry only a single copy of this allele rather than heterozygous gene pairs. In genetic ancestry platforms and recreational DNA typing, rs2032624 serves as a principal cornerstone for placing paternal lineages into the broader phylogenetic tree of humankind.
Biological Role of the DDX3Y Gene
The variant rs2032624 physically maps within the genomic footprint of the DDX3Y gene (DEAD-box helicase 3 Y-linked), which is positioned in the azoospermia factor a (AZFa) region on the long arm of the Y chromosome (Yq11.221). DDX3Y encodes an ATP-dependent RNA helicase involved in various aspects of cellular RNA metabolism, such as pre-mRNA splicing, RNA transport, and protein translation initiation. Complete structural deletions or severe functional loss-of-function lesions affecting DDX3Y and the broader AZFa microdeletion locus are known causes of spermatogenic failure and male infertility. However, common phylogenetic single nucleotide variants like rs2032624 are benign evolutionary markers. The presence of the derived allele defines an ancestral demographic lineage rather than a pathogenic disruption or medical impairment of spermatogenesis.
Phylogenetic Significance and Scientific Evidence
In human evolutionary genetics, rs2032624 is celebrated for defining the major branch known as Haplogroup R1 (Y-DNA), which branches from the ancestral macro-haplogroup R. Extensive molecular studies published in journals cataloging human paternal history demonstrate that the mutation arose tens of thousands of years ago, preceding the diversification of major Eurasian sub-lineages R1a and R1b. Systematic surveys across global cohorts have cataloged this marker extensively in forensic databases and phylogenetic trees maintained by organizations like the International Society of Genetic Genealogy (ISOGG). Scientific evidence conclusively confirms its reliability as an informative lineage identifier. However, there is no verified association in the GWAS Catalog, ClinVar, or PharmGKB connecting rs2032624 directly with pathological clinical traits, health outcomes, or altered drug metabolism.
Global Distribution Across Human Populations
The derived allele of rs2032624 demonstrates pronounced geographical and demographic clustering due to ancient human migrations following the Last Glacial Maximum. It is found at high frequencies throughout Western and Eastern European male populations, where downstream lineages R1b (common across Atlantic Western Europe) and R1a (common in Eastern Europe and parts of South Asia) predominate. It also maintains substantial representation across Central and Western Asian populations. In stark contrast, the derived R1 allele is virtually absent or observed only at extremely low baseline frequencies in indigenous East Asian, Native Australian, and sub-Saharan African lineages, with rare specific exceptions tied to prehistoric back-migrations into Central and West Africa (such as the R1b-V88 lineage).
Interpreting Your Results: Practical Implications
When a direct-to-consumer genetic test or whole-genome sequencing report highlights rs2032624, the finding should be interpreted through the lens of genealogy rather than clinical medicine. Identifying this allele reveals your deep paternal line's shared ancestry with historical European and Eurasian populations. Because rs2032624 does not confer elevated disease liability or modify response to medications, it requires no medical diagnosis, treatment plan, or clinical surveillance. Biological females do not carry a Y chromosome and will not have this variant called in autosomal genotyping data unless testing paternal male relatives. Genetic genealogy enthusiasts can use rs2032624 as a reliable milestone to contextualize their Y-DNA haplogroup classification within historical human migrations.
How common is this variant?
The derived allele is common across European and West Eurasian male paternal lineages, reaching high prevalence via subclades R1a and R1b, while remaining virtually absent or very rare in sub-Saharan African lineages.
Frequently asked questions
What does having the derived allele at rs2032624 mean for my health?
Carrying the derived allele at rs2032624 has no known health consequences. It functions strictly as an ancient genealogical marker used to trace paternal ancestry and is not associated with genetic disorders, elevated disease risks, or altered drug metabolism.
Why is only a single letter listed for my rs2032624 genotype?
rs2032624 is located on the non-recombining portion of the Y chromosome, meaning biological males possess only one copy of this locus (hemizygous). Consequently, testing platforms report a single nucleotide (such as C or A) rather than a two-letter pair common to autosomal chromosomes.
Can women find rs2032624 in their genetic test results?
Biological females generally do not have a Y chromosome and will show a 'no-call' or blank result for rs2032624 on standard genotyping panels. To trace this paternal lineage, a female individual can examine the Y-DNA test results of a biological father, brother, or paternal uncle.
How is rs2032624 related to Haplogroup R1?
In human phylogenetics, rs2032624 corresponds to the mutations historically termed M173 and P241. The occurrence of the derived mutation defines the branching point for Haplogroup R1, which subsequently split into major European and Asian haplogroups R1a and R1b.
Sources & further reading
Educational information only, last refreshed 9/8/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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