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Related Experiment Videos

A newly discovered human alpha-globin gene.

Sung-Ho Goh1, Y Terry Lee, Natarajan V Bhanu

  • 1Molecular Medicine Branch, National Institute of Diabetes, Digestive and Kidney Disease, National Institutes of Health, Bldg 10/Rm 9B17, 10 Center Dr, Bethesda, MD 20892, USA.

Blood
|April 28, 2005
PubMed
Summary

Scientists discovered a new human gene, mu-globin, related to avian alpha-D globin. This gene is transcribed in red blood cells during development but its protein product was not detected.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Hematology

Background:

  • The human alpha-globin locus on chromosome 16 is critical for red blood cell function.
  • Transcriptional profiling of human reticulocytes aims to identify novel gene expressions.
  • Previous studies have not identified the mu-globin transcript.

Purpose of the Study:

  • To identify and characterize a novel transcript homologous to the alpha-globin locus.
  • To investigate the expression pattern and evolutionary relationship of the newly identified mu-globin.
  • To determine the functional relevance of mu-globin in erythroid cells.

Main Methods:

  • Cloning and sequencing of the mu-globin transcript (GenBank AY698022).
  • Bioinformatic analyses including BLASTP, ClustalW, and phylogenetic analysis.

Related Experiment Videos

  • Quantitative real-time polymerase chain reaction (PCR) and Northern blot analysis.
  • Mass spectrometry for protein detection.

    • Main Results:

    • A novel transcript, mu-globin, was identified with a 423-nucleotide open reading frame.
    • Mu-globin shows high homology to avian alpha-D globin, with conserved heme- and globin-binding sites.
    • Mu-globin is transcribed in erythroid tissues at approximately 0.1% of alpha-globin levels.
    • Expression is erythroid-specific and peaks during erythroblast terminal differentiation.
    • Mu-globin protein was not detected by mass spectrometry despite significant transcription.

    Conclusions:

    • The human genome encodes a previously unrecognized globin, mu-globin, related to the avian alpha-D globin family.
    • Mu-globin is transcribed in a highly regulated manner in erythroid cells during specific differentiation stages.
    • The lack of detectable protein suggests potential post-transcriptional regulation or a non-functional protein product.