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Novel Pathogenic Variants of TMPRSS6 Gene in a Girl with Iron Refractory Iron Deficiency Anemia (IRIDA)
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  • Rawinun Udomponglukkana ,
  • Werasak Sasanakul,
  • Noppawan Tangbubpha ,
  • Ampaiwan Chuansumrit,
  • Thipwimol Tim-Aroon,
  • Pongpak Pongpitcha,
  • Nongnuch Sirachainan
Rawinun Udomponglukkana
Mahidol University Faculty of Medicine Ramathibodi Hospital
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Werasak Sasanakul
Mahidol University Faculty of Medicine Ramathibodi Hospital
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Noppawan Tangbubpha
Mahidol University Faculty of Medicine Ramathibodi Hospital
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Ampaiwan Chuansumrit
Mahidol University Faculty of Medicine Ramathibodi Hospital
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Thipwimol Tim-Aroon
Mahidol University Faculty of Medicine Ramathibodi Hospital
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Pongpak Pongpitcha
Mahidol University Faculty of Medicine Ramathibodi Hospital
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Nongnuch Sirachainan
Mahidol University Faculty of Medicine Ramathibodi Hospital

Corresponding Author:[email protected]

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Abstract

Iron refractory iron deficiency anemia (IRIDA) is an autosomal recessive disorder caused by mutations in the TMPRSS6 gene, which impairs iron homeostasis. We report a 4-year-old girl presented with a one-year history of IDA. Hemoglobin, transferrin saturation, and hepcidin levels were 6.5 g/dL, 1.6%, and 112.17 ng/mL, respectively. High-dose oral iron therapy partially corrected hemoglobin levels, and they declined after decreasing or stopping iron therapy. Genetic analysis of the TMPRSS6 gene identified compound heterozygotes of two novel pathogenic variants of c.811C>T in exon 7 (p.R271X) and c.1254C>G in exon 11 (p.Y418X). Her parents carried a heterozygous mutation of each variant.