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Progressive desialidation of human transferrin.

E T Blake1

  • 1Forensic Science Associates, Emeryville, CA.

Journal of Forensic Sciences
|September 1, 1987
PubMed
Summary

Altered transferrin banding patterns in forensic samples are caused by sialic acid removal. Neuraminidase treatment is essential for accurate transferrin typing in these cases.

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Area of Science:

  • Biochemistry
  • Forensic Science
  • Molecular Biology

Background:

  • Transferrin is a serum glycoprotein with four sialic acid residues influencing its electrophoretic mobility.
  • Electrophoretic alterations in transferrin are observed in forensic casework, especially with postmortem samples, often presenting as a 'ladder' banding pattern.

Purpose of the Study:

  • To investigate if the 'ladder' banding pattern in transferrin is due to sialic acid removal.
  • To determine the necessity of complete sialic acid removal for accurate transferrin typing.

Main Methods:

  • Serum samples of known transferrin types were treated with neuraminidase.
  • Electrophoretic analysis was performed on treated and untreated samples.

Main Results:

  • Neuraminidase treatment supported the hypothesis that sialic acid removal causes the 'ladder' banding pattern.
  • Partially desialidated transferrin variants were difficult to type accurately.
  • Complete sialic acid stripping via neuraminidase enabled reliable typing of altered transferrin samples.

Conclusions:

  • The 'ladder' banding pattern in forensic transferrin samples is likely due to sialic acid removal by neuraminidase.
  • Complete desialylation using neuraminidase is crucial for accurate typing of transferrin variants in forensic analysis.

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