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A missense mutation in TFRC, encoding transferrin receptor 1, causes combined immunodeficiency
Haifa H Jabara1,2, Steven E Boyden3,4,5, Janet Chou1,2
1Division of Immunology, Boston Children's Hospital, Boston, Massachusetts, USA.
Nature Genetics
|December 8, 2015
Summary
A genetic mutation in transferrin receptor 1 (TfR1) causes combined immunodeficiency by impairing T and B cell function. STEAP3 may mitigate anemia by assisting TfR1 function in red blood cells.
Area of Science:
- Immunology
- Cell Biology
- Genetics
Background:
- Combined immunodeficiency can arise from impaired T and B cell function.
- Transferrin receptor 1 (TfR1) is crucial for cellular iron uptake.
- Genetic defects in TfR1 can impact immune cell function.
Purpose of the Study:
- To investigate the molecular basis of a combined immunodeficiency linked to transferrin receptor 1 (TfR1).
- To explore the role of TfR1 in immune cell function and erythrocyte development.
- To identify potential mechanisms mitigating severe anemia in patients with TfR1 defects.
Main Methods:
- Genetic sequencing to identify mutations in the TFRC gene.
- Cellular assays measuring transferrin uptake and TfR1 expression.
- Generation and analysis of Tfrc(Y20H/Y20H) mouse models.
- Co-immunoprecipitation to assess protein interactions.
Main Results:
- A homozygous p.Tyr20His substitution in TfR1 was identified in patients with combined immunodeficiency.
- This mutation disrupts TfR1 internalization, leading to defective endocytosis and increased cell surface expression.
- Tfrc(Y20H/Y20H) mice exhibited similar immunological defects.
- Patients presented with mild anemia, and STEAP3 was found to associate with TfR1, partially rescuing transferrin uptake.
Conclusions:
- Defects in TfR1 internalization are critical for adaptive immunity.
- STEAP3 may act as an accessory factor for TfR1 endocytosis, preventing severe anemia in affected individuals.
- This study highlights the multifaceted role of TfR1 in both immunity and erythropoiesis.
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