Inherited human TFIIIA deficiency disrupts T cell development
TFIIIA deficiency is identified as a novel genetic cause of severe combined immunodeficiency, highlighting its critical role in T cell development.
Where it sits
this study against the rest of the tb-500 ac-lkktetq corpusSummary and findings
This study investigates biallelic deleterious variants in GTF3A, which encodes transcription factor IIIA (TFIIIA), in patients with severe combined immunodeficiency (SCID) or combined immune deficiency (CID). The research identifies ten patients from eight unrelated families across eight countries and describes the mechanisms by which TFIIIA deficiency affects T cell development. No therapeutic claims are made.
Abstract
<h4>ABSTRACT</h4> Molecular characterization of human monogenic inborn errors of T cell immunity provides both biological insights and medical progress. We report rare biallelic deleterious variants in GTF3A , encoding transcription factor IIIA (TFIIIA), a zinc-finger protein required for transcription and chaperoning of 5S ribosomal RNA (rRNA). These variants were identified in ten patients from eight unrelated families and eight countries presenting with either T - B + NK + severe combined immunodeficiency (SCID) or combined immune deficiency (CID), characterized by T cell lymphopenia and variable antibody deficiency. The GTF3A variants disrupt TFIIIA function through distinct mechanisms, including defective DNA binding, aberrant nuclear localization, and reduced protein stability compromising TFIIIA-mediated transcription and chaperoning of 5S rRNA. Using artificial thymic organoids derived from TFIIIA-deficient CD34⁺ progenitors, an early developmental arrest at the T cell commitment stage was documented in vitro . Zebrafish deficient for gtf3aa recapitulated the impaired thymocyte development in vivo . Together, these findings establish TFIIIA deficiency as a novel cause of (S)CID, expanding the genetic and mechanistic landscape of inborn errors of T cell immunity and uncovering an essential role for TFIIIA in human adaptive immunity. <h4>One-sentence summary</h4> Biallelic GTF3A variants causing TFIIIA deficiency, which disrupts 5S rRNA transcription, represent a novel monogenic cause of (S)CID, unveiling a crucial role of TFIIIA in T cell development.
Background
The study appears to investigate the role of TFIIIA, a transcription factor, in T cell development. TFIIIA is known to be involved in transcriptional regulation, but its specific role in immune cell development is not well understood. This research could provide insights into genetic factors affecting immune system function.
Methods
Not reported in abstract.
Results
Not reported in abstract.
Interpretation
Without access to the abstract or full text, it is difficult to assess how this study compares to existing literature or its clinical significance. The title suggests a genetic deficiency affecting T cell development, which could have implications for understanding immune disorders.
Key findings
- Not reported in abstract.
Limitations
- Abstract not available
- Preprint status, not peer-reviewed
- Unknown sample size
- Unknown study design
- Unknown dosing information