Glucose phosphate isomerase (GPI) Tadikonda: Characterization of a novel Pro340Ser mutation

Ahmar U. Zaidi, Prabhakar Kedar, Prasad Rao Koduri, Gerard W. Goyette, Steven Buck, Donald E. Paglia, Yaddanapudi Ravindranath

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5 Scopus citations

Abstract

After a thirty-year lag, we serendipitously reestablished contact with a patient with glucose phosphate isomerase deficiency and hydrops fetalis first reported in 1987. We now provide a clinical update and provide results of mutation analysis in this patient, from Southern India. The patient now an adult female of 36 years of age has moderate anemia but requires no transfusions except with some intercurrent illnesses. Exome sequencing studies showed a homozygous c.1018C>T (Pro340Ser) mutation in exon 12 of the glucose phosphate isomerase gene and later confirmed by direct sequencing. This mutation has not been previously described. To our knowledge, this is also the first known homozygous mutation in the hydrophobic core of the protein and is a highly deleterious mutation by in silico analysis and by clinical history in the family. Flow cytometry studies of band 3 content with eosin maleimide showed a unique tail of red cells on histograms, reflecting the dense red cells (presumably ATP depleted) seen on blood smears; similar findings were seen in patients with pyruvate kinase and phosphoglycerate kinase deficiency.

Original languageEnglish
Pages (from-to)449-454
Number of pages6
JournalPediatric Hematology and Oncology
Volume34
Issue number8
DOIs
StatePublished - Nov 17 2017
Externally publishedYes

Keywords

  • Glycolytic defects
  • hematology
  • red cells

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