Question 1

What is TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

TCR-alpha-beta-positive T-cell deficiency is a rare immune disorder that affects the body’s ability to fight infections. People with this condition experience recurrent respiratory infections, candidiasis, diarrhea, and can have challenges with growth (failure to thrive). This disorder is described as a non-severe combined immunodeficiency, meaning the immune system is not completely absent, but its function is impaired.

Along with infections, features of immune dysregulation are common. These include a tendency toward herpes viral infections, high levels of eosinophils (hypereosinophilia), as well as skin and hair changes like vitiligo and alopecia areata. Laboratory tests show that the usual TCR-alpha-beta positive T-cells are mostly absent, while T-cells expressing TCR-gamma-delta are present.

Question 2

What are the symptoms of TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

Common signs and symptoms include repeated respiratory infections, candidiasis (a type of yeast infection), diarrhea, and failure to thrive. People with this condition may also have a predisposition to herpes infections, swollen lymph nodes (lymphadenopathy), enlargement of the liver and spleen (hepatosplenomegaly), high eosinophil counts, and skin conditions such as vitiligo and hair loss (alopecia areata).

Question 3

What causes TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

TCR-alpha-beta-positive T-cell deficiency is linked to changes in the immune system, including a genetic alteration in the TRAC gene. The mutation affects the T-cell receptor, leading to an imbalance where cells bearing the TCR-alpha-beta are very low, while those with TCR-gamma-delta are more common. This genetic cause contributes to the problems with the immune response seen in this condition. Associated genes include TRAC.

Question 4

How is TCR-alpha-beta-positive T-cell deficiency inherited?

Accepted Answer

TCR-alpha-beta-positive T-cell deficiency follows an autosomal recessive inheritance pattern. This means a child must inherit a copy of the altered gene from both parents to develop the condition. Parents who each carry one copy typically do not show symptoms.

Question 5

How rare is TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

TCR-alpha-beta-positive T-cell deficiency is classified as very rare. The estimated prevalence is approximately <1 in 1,000,000. Because rare disease data can be limited, actual numbers may differ from published estimates.

Question 6

How is TCR-alpha-beta-positive T-cell deficiency diagnosed?

Accepted Answer

Diagnosis is made through immunological testing. Blood tests typically check the levels and types of T-cells. In people with TCR-alpha-beta-positive T-cell deficiency, tests reveal very low or absent TCR-alpha-beta expressing T-cells, with a notable presence of TCR-gamma-delta positive T-cells.

Question 7

Are there treatments for TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

Information about treatment is currently limited for this condition.

Question 8

What complications can arise from TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

People with TCR-alpha-beta-positive T-cell deficiency may face complications like recurrent infections, particularly respiratory infections and candidiasis. They can also experience immune dysregulation, which may lead to conditions such as high eosinophil counts and skin changes like vitiligo and alopecia areata. These complications can affect daily life and overall health.

Question 9

How does TCR-alpha-beta-positive T-cell deficiency impact daily life?

Accepted Answer

Living with TCR-alpha-beta-positive T-cell deficiency can mean frequent visits to the doctor due to recurrent infections. Families may need to be extra cautious about exposure to germs and may have to manage symptoms like diarrhea and failure to thrive. Support from healthcare providers can help in managing these challenges.

Question 10

What is the prognosis for someone with TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

Currently, information about the long-term prognosis for TCR-alpha-beta-positive T-cell deficiency is limited. However, since it is classified as a non-severe combined immunodeficiency, individuals may have some immune function but still face challenges. Regular medical care and monitoring can help manage symptoms and improve quality of life.

Question 11

Are there any specific specialists recommended for TCR-alpha-beta-positive T-cell deficiency?

Accepted Answer

For TCR-alpha-beta-positive T-cell deficiency, it is important to work with an immunologist who specializes in immune disorders. They can provide guidance on managing infections and monitoring immune function. Additionally, a pediatrician may be helpful for children to address growth and development concerns.

Research Type	Count	% of Total
Laboratory research	16	84%

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TCR-alpha-beta-positive T-cell deficiency

Overview

Clinical Presentation

Genetic Landscape

Diagnosis

Prognosis

Research Landscape

Medical References

External Resources

OMIM

Orphanet

GARD

Questions for Your Care Team

Questions for Your Care Team

FAQ

Frequently Asked Questions

Explore clinical features

Recent Publications

TCR-alpha-beta-positive T-cell deficiency

Overview

Clinical Presentation

Genetic Landscape

Diagnosis

Prognosis

Research Landscape

Medical References

External Resources

OMIM

Orphanet

GARD

Related Diseases

Questions for Your Care Team

Questions for Your Care Team

FAQ

Frequently Asked Questions

What is TCR-alpha-beta-positive T-cell deficiency?

What are the symptoms of TCR-alpha-beta-positive T-cell deficiency?

What causes TCR-alpha-beta-positive T-cell deficiency?

How is TCR-alpha-beta-positive T-cell deficiency inherited?

How rare is TCR-alpha-beta-positive T-cell deficiency?

How is TCR-alpha-beta-positive T-cell deficiency diagnosed?

Are there treatments for TCR-alpha-beta-positive T-cell deficiency?

What complications can arise from TCR-alpha-beta-positive T-cell deficiency?

How does TCR-alpha-beta-positive T-cell deficiency impact daily life?

What is the prognosis for someone with TCR-alpha-beta-positive T-cell deficiency?

Are there any specific specialists recommended for TCR-alpha-beta-positive T-cell deficiency?

Explore clinical features

Recent Publications