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KLF1 gene mutations cause borderline HbA(2).

Lucia Perseu1, Stefania Satta, Paolo Moi

  • 1Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Ricerche, Cagliari, Italy.

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This summary is machine-generated.

KLF1 gene mutations can cause borderline hemoglobin A2 levels, presenting a challenge for beta-thalassemia carrier screening. Identifying these KLF1 mutations aids in accurately diagnosing at-risk couples.

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Area of Science:

  • Hematology
  • Genetics

Background:

  • Elevated hemoglobin A2 (HbA2) levels above 3.9% are indicative of beta-thalassemia carriers.
  • Borderline HbA2 levels (3.3%-3.8%) pose a screening challenge, with unknown genetic causes in some individuals.

Purpose of the Study:

  • To investigate the role of KLF1 gene mutations in individuals presenting with borderline HbA2 levels and normal red blood cell indices.
  • To identify novel KLF1 mutations associated with this atypical phenotype.

Main Methods:

  • Genetic analysis of 145 subjects with borderline HbA2 and normal mean corpuscular volume/hemoglobin.
  • Sequencing of the KLF1 gene to identify mutations.
  • Genotyping analysis, particularly in Sardinian populations.

Main Results:

  • Six distinct KLF1 mutations were identified in 52 subjects (35.9%) with borderline HbA2.
  • Two novel KLF1 mutations (T327S and T280_H283del) were reported for the first time.
  • The S270X mutation was prevalent in Sardinians, accounting for 80.8% of identified KLF1 mutations in this group.

Conclusions:

  • KLF1 mutations are a significant cause of borderline HbA2 levels in individuals without beta-thalassemia.
  • Identification of KLF1 mutations improves the accuracy of thalassemia screening programs.
  • This finding helps in the identification of at-risk couples for genetic counseling.