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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
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Hemoglobin Alpha Chain Variant Zara Associated With Familial Asymptomatic Hypoxemia.

Anthony Pasquarella1, Erin Miller1, Edward C C Wong2

  • 1Division of Oncology-Hematology, Department of Medicine, NYU Long Island School of Medicine, NYU Perlmutter Cancer Center, Mineola, NY, USA.

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Summary

A rare hemoglobin (Hb) gene variant, Hb Zara, was linked to asymptomatic hypoxemia in a father and daughter. This finding underscores the need to consider hemoglobinopathies in unexplained low oxygen saturation cases.

Keywords:
Hemoglobin ZaraHemoglobinopathyHypoxemia

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Area of Science:

  • Genetics
  • Hematology
  • Molecular Biology

Background:

  • Hemoglobin (Hb) gene mutations cause diverse clinical presentations, from mild carrier states to severe hemolytic anemias.
  • Hypoxemia, or low oxygen saturation, can stem from various causes, including cardiovascular and pulmonary conditions.

Observation:

  • A father and daughter presented with unexplained asymptomatic hypoxemia.
  • Both individuals were identified as carriers of a rare Hb gene variant, Hb Zara (c.274C>A, p.Leu92Ile), located in the alpha2-globin gene.

Findings:

  • Genetic sequencing confirmed heterozygosity for the Hb Zara variant in both affected family members.
  • This is the first reported association between the Hb Zara variant and familial asymptomatic hypoxemia.

Implications:

  • This case highlights the potential for certain Hb variants, even those of unknown significance, to cause clinically relevant conditions like hypoxemia.
  • It emphasizes the importance of including hemoglobinopathy evaluation in the diagnostic workup for patients with persistent, unexplained hypoxemia.