Two Novel SUPT5H Variants Causing β-Thalassemia Trait Phenotypes.

Area of Science:

• Genetics
• Hematology
• Molecular Biology

Background:

• Beta-thalassemia is a genetic blood disorder caused by reduced beta-globin gene expression.
• Genetic defects in regulatory genes like KLF1, ERCC2, and SUPT5H can lead to beta-thalassemia phenotypes.
• SUPT5H's role in beta-globin gene regulation is not fully understood.

Purpose of the Study:

• To identify novel genetic variants associated with beta-thalassemia-like phenotypes.
• To investigate the functional impact of identified variants on beta-globin gene regulation.
• To further elucidate the role of SUPT5H in beta-thalassemia.

Main Methods:

• Genetic sequencing to identify variants in affected families.
• Hematological profiling of individuals carrying identified variants.
• Analysis of SUPT5H variants and their association with HBB gene regulation.

Main Results:

• Two novel SUPT5H variants were identified: a splice-site variant (c.967-1G>A) in Family 1 and a frameshift variant (c.2605delC, p.Q869Rfs*85) in Family 2.
• Hematological profiles of carriers were consistent with previously reported heterozygous SUPT5H-related traits.
• Findings support the role of SUPT5H haploinsufficiency in modulating HBB gene regulation.

Conclusions:

• Novel SUPT5H variants can cause beta-thalassemia-like phenotypes.
• SUPT5H haploinsufficiency is implicated in the pathogenesis of beta-thalassemia.
• Further research into SUPT5H's regulatory mechanisms is warranted.