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The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.
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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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The Lambda Select cII Mutation Detection System
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A RHAG point mutation selectively disrupts Rh antigen expression.

S Mu1, Y Cui1, W Wang1

  • 1Department of Transfusion Medicine, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.

Transfusion Medicine (Oxford, England)
|March 7, 2018
PubMed
Summary
This summary is machine-generated.

A novel mutation in the Rh-associated glycoprotein (RhAG) gene causes spherocytosis by disrupting red blood cell structure and Rh antigen expression. This finding clarifies a molecular mechanism for Rh antigen-related blood disorders.

Keywords:
antigen expressionerythrocytemutationrhesus glycoprotein

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Area of Science:

  • Genetics and Molecular Biology
  • Hematology
  • Biochemistry

Background:

  • Rhesus-associated glycoprotein (RhAG) is essential for erythrocyte integrity and Rh complex formation.
  • Missense mutations in the RhAG gene can lead to spherocytosis and altered Rh antigen expression.
  • This study investigates a novel RhAG mutation impacting Rh antigen expression and red blood cell morphology.

Observation:

  • Atomic force microscopy revealed spherocytosis in the proband's erythrocytes.
  • Flow cytometry demonstrated incomplete disruption of RhAG and selective knockout of RhD antigen expression.
  • Genetic sequencing identified a novel missense mutation (236G>A, S79N) in the RHAG gene.

Findings:

  • The identified RHAG mutation (S79N) is necessary and sufficient to cause spherocytosis.
  • The mutation is located near critical structural elements of the RhAG protein, affecting its function.
  • This novel mutation significantly reduces RhAG antigen expression and agglutination intensity.

Implications:

  • Elucidates a molecular mechanism underlying Rh antigen expression and hereditary spherocytosis.
  • Provides insights into the structure-function relationship of RhAG in red blood cells.
  • Contributes to understanding the genetic basis of blood group antigen variations and associated disorders.