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Related Experiment Videos

Point mutations causing the McLeod phenotype.

David C W Russo1, Soohee Lee, Marion E Reid

  • 1Lindsley F. Kimball Research Institute, The New York Blood Center, New York, New York 10021, USA. drusso@nybc.org

Transfusion
|April 19, 2002
PubMed
Summary

Multiple mutations in the XK gene can cause the McLeod phenotype, affecting Kx antigen expression and leading to neuromuscular issues. These genetic alterations disrupt RNA splicing or protein transport to the cell surface.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Hematology

Background:

  • The McLeod phenotype is characterized by absent Kx, weakened Kell antigens, and acanthocytosis, often leading to late-onset neuromuscular problems.
  • Previously identified causes of the McLeod phenotype include gene deletions, insertions, and point mutations affecting RNA splicing or causing premature stop codons.

Purpose of the Study:

  • To investigate the genetic basis of the McLeod phenotype in four unrelated males.
  • To identify novel mutations in the XK gene responsible for the McLeod phenotype.

Main Methods:

  • Sequencing of the coding and flanking intron regions of the XK gene in four individuals with the McLeod phenotype.
  • PCR amplification of genomic DNA followed by sequencing.
  • Expression of mutant cDNA in a heterologous cell system to determine cell surface protein expression.

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Main Results:

  • Three individuals exhibited mutations disrupting conserved GT sequences at RNA splice sites (two with G>C at intron 1 5' splice site, one with G>A at intron 2 5' splice site).
  • One individual had a 746C>G mutation in exon 3, resulting in an R222G amino acid substitution.
  • The R222G mutant protein failed to be transported to the cell surface in transfected cells.

Conclusions:

  • The McLeod phenotype can result from various mutations within the XK gene.
  • Mutations can affect RNA splicing or protein trafficking, leading to the McLeod phenotype.