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A case of a newborn infant with Hb M Iwate
Insights
Researchers identified a novel infant-specific hemoglobin M Iwate variant (alpha M2 gamma 2) in a newborn. This finding expands understanding of hereditary methemoglobinemia in infants.
Area of Science:
- Hematology
- Biochemistry
- Genetics
Background:
- Hereditary methemoglobinemia is a group of disorders characterized by elevated methemoglobin levels.
- Hb M variants are a common cause, often identified through hemoglobin electrophoresis and spectroscopy.
Observation:
- An infant suspected of having Hb M Iwate exhibited abnormal hemoglobin fractions upon column chromatography and isoelectric focusing.
- Two distinct Hb M fractions were isolated from the infant's hemolysate.
Findings:
- One fraction matched adult Hb M Iwate (alpha M2 beta 2), while the other was a novel variant.
- Chain analysis revealed the novel variant as alpha M2 gamma 2, suggesting it is infant-specific.
Implications:
- This discovery identifies a new Hb M variant unique to the neonatal period.
- It highlights the importance of comprehensive hemoglobin analysis in diagnosing hereditary methemoglobinemia in newborns.
Abstract:
Hemoglobin of a newborn infant who was suspected to hereditarily have Hb M Iwate was examined. The infant hemolysate was separated into five fractions by column chromatography on Amberlite CG-50, and two of these fractions showed absorption spectra corresponding with that of Hb M Iwate. Five bands were found after the isoelectric focusing of the hemolysate, and two of these bands were brown. The two Hb M fractions obtained by column chromatography was focused to the positions of the brown bands. One of these Hbs M corresponded with Hb M Iwate (alpha M2 beta 2) from an adult carrier of this trait, but the other was not found in adult hemolysates. The latter species of Hb M was shown to be composed of the abnormal alpha chain and the normal gamma chain (alpha M2 gamma 2) by chain analysis, and was assumed to be specific for infants. A quantitative estimation of the hemoglobins in the infant hemolysate showed that there was no difference between the relative quantities of the fetal and adult forms of Hb M Iwate.