HTRA1 rs587776448: Understanding This Rare Genetic Variant
The rs587776448 variant is a rare genetic change located in the HTRA1 gene. It is primarily associated with cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL), a rare hereditary condition affecting small blood vessels in the brain.
What each genotype means
Typical HTRA1 genotype
This is the common, expected genotype for the HTRA1 gene in the general population. It does not carry the specific mutation associated with the rare condition known as CARASIL.
This is the most common genotype found in the vast majority of the global population.
Potential carrier status
This genotype indicates you are a carrier of one copy of the variant. While CARASIL is typically inherited in an autosomal recessive pattern, some research suggests that heterozygous HTRA1 mutations may still be associated with a risk for cerebral small vessel disease. You should discuss these findings with a healthcare provider to understand your personal health context.
This genotype is rare, occurring at a very low frequency across most populations.
What is the rs587776448 Variant?
The rs587776448 variant is a specific genetic alteration identified within the HTRA1 gene, which is located on chromosome 10. In genetic databases, this variant is often described as a deletion of a single guanine nucleotide (g.124221294delG). Because it involves the loss of a base pair, it is classified as a frameshift mutation, which can significantly alter how the cell reads the genetic instructions for building a protein. This variant is cataloged in major genetic repositories like ClinVar and dbSNP, where it is recognized for its clinical significance in relation to specific hereditary neurological conditions. Understanding the location and nature of this variant is a foundational step for researchers studying how small changes in our DNA sequence can lead to complex health outcomes.
The Role of the HTRA1 Gene
The HTRA1 gene provides the blueprint for the HtrA serine peptidase 1 enzyme. This enzyme plays a critical role in regulating signaling pathways, particularly by controlling the activity of the transforming growth factor-beta (TGF-beta) family. TGF-beta signaling is essential for maintaining the structural integrity of blood vessels throughout the body. When the HTRA1 gene is mutated, the resulting enzyme may have reduced or lost function, leading to an overactive TGF-beta signaling pathway. This dysregulation is believed to cause abnormalities in the small blood vessels of the brain, a condition known as arteriopathy. These vessel changes can restrict blood flow and increase the risk of strokes and other neurological impairments, which are the hallmark features of conditions linked to this gene.
Research and Clinical Associations
Scientific research has established a strong link between biallelic (two-copy) mutations in the HTRA1 gene and CARASIL. CARASIL is a rare, inherited cerebral small-vessel disease characterized by early-onset stroke, cognitive decline, and sometimes alopecia or back pain. While the evidence for this variant's role in CARASIL is considered moderate to strong in clinical literature, the clinical picture is evolving. Recent studies have also begun to investigate whether heterozygous carriers—those with only one copy of a variant—might experience milder or late-onset symptoms of cerebral small-vessel disease. It is important to note that the clinical expression of these variants can be variable, and not every individual with a specific genotype will manifest the same symptoms. Research is ongoing to better understand the full spectrum of how these mutations impact brain health over a lifetime.
Population Frequency and Interpretation
The rs587776448 variant is classified as rare across global populations. Because it is so uncommon, it is not typically found in the general population at high frequencies. Most reported cases of CARASIL have been identified in specific families or populations, such as those in Japan, though cases have been documented globally. When interpreting genetic information, it is vital to remember that the presence of a rare variant does not automatically equate to a diagnosis. Genetic testing results should always be interpreted by a qualified medical professional or genetic counselor who can place the findings in the context of an individual's personal and family health history. This information is for educational purposes and should not be used to make personal medical decisions or to diagnose any condition.
How common is this variant?
The rs587776448 variant is extremely rare in the general population, with most documented cases appearing in specific familial studies rather than broad population cohorts.
Frequently asked questions
What is CARASIL?
CARASIL is a rare, inherited disorder that affects the small blood vessels in the brain. It is caused by mutations in the HTRA1 gene and can lead to strokes, cognitive impairment, and other neurological symptoms.
Does having this variant mean I will get sick?
Not necessarily. Genetic variants are only one piece of the puzzle. You should consult with a genetic counselor or a neurologist to understand what your specific results mean for your health.
Is there a cure for HTRA1-related conditions?
Currently, there is no cure for CARASIL. Management focuses on treating symptoms and reducing stroke risk factors under the guidance of a medical specialist.
Should I get tested for this variant?
Genetic testing is typically recommended only if there is a strong family history of stroke or specific neurological symptoms. Discuss the necessity of testing with your doctor.
Sources & further reading
Educational information only, last refreshed 9/21/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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