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Combined congenital deficiencies of intrinsic factor and R binder
J Zittoun1, J Léger, J Marquet
1Laboratoire Central d'Hématologie, Hôpital Henri Mondor, Créteil, France.
Insights
This study identified coexisting deficiencies of intrinsic factor (IF) and R binder in a boy with severe anemia and neurological issues. The findings suggest a potential genetic link between these two vitamin B12-binding proteins.
Area of Science:
- Hematology
- Genetics
- Biochemistry
Background:
- Vitamin B12 is essential for red blood cell formation and neurological function.
- Intrinsic factor (IF) and R binder are key proteins involved in vitamin B12 absorption and transport.
- Deficiencies in these proteins can lead to megaloblastic anemia and neurological damage.
Observation:
- A severe case of megaloblastic anemia, growth retardation, and neurological dysfunction was observed in an Algerian boy.
- The patient presented with coexisting deficiencies of both intrinsic factor (IF) and R binder.
- Gastric acid secretion and mucosa were normal, but IF was absent from gastric juice.
Findings:
- R binder was absent from gastric juices, serum, saliva, and leukocytes.
- The patient's anemia responded well to cyanocobalamin and folic acid treatment.
- The patient's father had a serum R binder deficiency but was asymptomatic, indicating a potential genetic component.
Implications:
- This unique case suggests a possible genetic association between IF and R binder deficiencies.
- Further research may elucidate the genetic mechanisms underlying these related vitamin B12-binding proteins.
- Understanding these deficiencies is crucial for diagnosing and managing related hematological and neurological disorders.
Abstract:
Coexisting deficiencies of both intrinsic factor (IF) and R binder were identified in an Algerian boy who presented with severe megaloblastic anemia, growth retardation, and neurologic dysfunction with typical features of subacute combined degeneration of the spinal cord. The anemia responded completely to cyanocobalamin and folic acid. IF was absent from gastric juice, but acid secretion and gastric mucosa were normal. R binders were absent from gastric juices as well as from serum, saliva, and polymorphonuclear leukocytes. The patient's father exhibited absence of R binder in his serum with a low serum vitamin B12 level and was asymptomatic. This unique case of simultaneous IF and R binder deficiencies suggests a genetic association between these two functionally and immunologically dissimilar, but structurally close vitamin B12-binding proteins.