TBX6 rs2289292: Understanding Its Role in Congenital Scoliosis
The rs2289292 variant is a single-nucleotide polymorphism located within the TBX6 gene. It serves as a key tagging marker for a common hypomorphic risk haplotype that, when inherited alongside a rare loss-of-function mutation, contributes to susceptibility for congenital scoliosis.
What each genotype means
Typical vertebral development profile
You carry two copies of the common C allele at rs2289292 in the TBX6 gene. This genotype represents the baseline reference sequence and does not tag the hypomorphic risk haplotype associated with congenital scoliosis. It is considered an average, baseline profile for vertebral segmentation traits.
Carried by approximately 70% to 75% of individuals of European ancestry and roughly 35% of individuals of East Asian ancestry.
Carrier of hypomorphic risk allele
You carry one copy of the T allele at rs2289292, which frequently co-occurs in a specific noncoding risk haplotype (T-C-A) that moderately reduces TBX6 gene expression. By itself, carrying this single variant does not cause vertebral defects and is found commonly among healthy individuals. Manifestation of congenital scoliosis typically requires compound inheritance with a rare, severe loss-of-function mutation or 16p11.2 deletion on the other chromosome.
Carried by approximately 45% to 50% of individuals of East Asian ancestry and about 25% of individuals of European ancestry.
Hypomorphic haplotype homozygote
You carry two copies of the T allele at rs2289292, which is part of the common hypomorphic TBX6 haplotype. Studies show that even having two hypomorphic alleles generally does not reduce TBX6 expression enough to cause congenital scoliosis on its own. Clinically significant vertebral malformations have almost exclusively been observed when a hypomorphic allele is paired with a null mutation on the second allele.
Found in roughly 15% to 20% of East Asian populations and approximately 2% to 3% of European populations.
What is rs2289292?
The rs2289292 variant is a synonymous single-nucleotide polymorphism (SNP) located in the final exon of the TBX6 gene. In genetics, a synonymous variant means that while the DNA sequence is altered, the resulting protein sequence remains unchanged. However, this specific SNP is highly significant because it acts as a reliable 'tag' for a larger genetic structure known as a haplotype. A haplotype is a group of gene variants that are inherited together from a single parent. In the case of rs2289292, it is one of three common SNPs (alongside rs3809624 and rs3809627) that form a specific risk haplotype often referred to as the 'T-C-A' haplotype. Because these markers are physically close to one another on the chromosome, they are typically passed down as a single unit, allowing researchers to use rs2289292 as a proxy to identify the presence of this entire genetic block.
The Role of the TBX6 Gene
The TBX6 gene provides instructions for creating a protein that acts as a transcription factor, which is a protein that helps control the activity of other genes. TBX6 is essential during early embryonic development, particularly for the formation of the paraxial mesoderm—the tissue that eventually gives rise to the vertebrae, muscles, and ribs. Proper function of the TBX6 protein is critical for the correct segmentation of the spine. When TBX6 function is significantly reduced or absent, the development of the vertebral column can be disrupted, leading to structural abnormalities such as hemivertebrae, where a vertebra is only partially formed. These developmental errors are the hallmark of congenital scoliosis, a condition characterized by an abnormal curvature of the spine present at birth. The gene's dosage is vital; even a partial reduction in its activity can have clinical consequences when combined with other genetic factors.
Research and Clinical Associations
Research has established a 'compound inheritance' model for a subset of congenital scoliosis cases, now termed TBX6-associated congenital scoliosis (TACS). In this model, an individual inherits a rare, severe loss-of-function mutation (such as a large deletion or a nonsense mutation) on one chromosome and the common hypomorphic 'T-C-A' risk haplotype on the other. The risk haplotype is considered 'hypomorphic,' meaning it produces a protein with reduced function. While the haplotype alone is common and generally benign in the general population, it becomes a significant risk factor when paired with a null mutation that effectively disables the other copy of the gene. Studies have shown that this specific combination accounts for approximately 10% of sporadic congenital scoliosis cases in certain cohorts. The evidence for this association is considered moderate to strong within the context of this specific compound inheritance model, though it is not a direct cause of scoliosis on its own.
Population Frequency and Variability
The frequency of the rs2289292 variant and the associated T-C-A haplotype varies significantly across different global populations. Because this is a common genetic variant, many individuals carry one or two copies of the risk allele without ever developing congenital scoliosis. The clinical relevance of the variant is almost entirely dependent on the presence of a rare, deleterious mutation in trans (on the opposite chromosome). Consequently, the prevalence of TACS is relatively low, even in populations where the risk haplotype is common. Researchers have observed that the frequency of TACS cases can differ between ethnic groups, likely due to variations in the underlying genetic background and the prevalence of rare null mutations. It is important to note that having the risk haplotype is not a diagnosis; it is simply a common genetic feature that only contributes to disease risk under very specific, rare circumstances.
What This Information Means for You
If you have information about your rs2289292 genotype, it is important to understand that this variant is common and is not a standalone indicator of health or disease. The association with congenital scoliosis is highly specific to a compound inheritance model involving rare, severe mutations that are not typically captured by standard, broad-spectrum genetic testing. This information cannot be used to diagnose scoliosis or predict its development. If you or a family member have concerns regarding spinal health, congenital conditions, or family history of vertebral malformations, the most appropriate step is to consult with a medical geneticist or a specialized physician. They can provide context based on clinical symptoms and, if necessary, order appropriate diagnostic testing. Never use genetic data to make medical decisions or alter treatments without the direct guidance of a qualified healthcare professional.
How common is this variant?
The rs2289292 variant is common across many global populations, with allele frequencies varying by ancestry. It is a standard polymorphism found in a significant portion of the general population.
Frequently asked questions
Does having the rs2289292 risk allele mean I will have scoliosis?
No. The rs2289292 variant is very common in the general population. It only contributes to scoliosis risk when inherited alongside a rare, severe loss-of-function mutation in the TBX6 gene.
What is TBX6-associated congenital scoliosis (TACS)?
TACS is a specific form of congenital scoliosis caused by a compound inheritance model. It occurs when an individual inherits a rare, disabling mutation on one copy of the TBX6 gene and a common, reduced-function risk haplotype on the other.
Can I use a home DNA test to see if I have TACS?
Standard consumer genetic tests are generally not designed to detect the rare, severe mutations required for TACS. If you have clinical concerns, you should speak with a medical geneticist.
Is rs2289292 the same as a 16p11.2 deletion?
No. A 16p11.2 deletion is a large structural change in the chromosome that can remove the TBX6 gene entirely. The rs2289292 SNP is a small, single-letter change within the gene itself.
Sources & further reading
Educational information only, last refreshed 10/28/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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