Blog

A new interesting article has been published in Clin Chem. 2019 Aug;65(8):986-994. doi: 10.1373/clinchem.2018.295766. Epub 2019 Apr 30. and titled:

Diagnosis of Hemoglobinopathy and β-Thalassemia by 21 Tesla Fourier Transform Ion Cyclotron Resonance Mass Spectrometry and Tandem Mass Spectrometr…

Authors of this article are:

He L, Rockwood AL, Agarwal AM, Anderson LC, Weisbrod CR, Hendrickson CL, Marshall AG.

A summary of the article is shown below:

BACKGROUND: Hemoglobinopathies and thalassemias are the most common genetically determined disorders. Current screening methods include cation-exchange HPLC and electrophoresis, the results of which can be ambiguous because of limited resolving power. Subsequently, laborious genetic testing is required for confirmation.METHODS: We performed a top-down tandem mass spectrometry (MS/MS) approach with a fast data acquisition (3 min), ultrahigh mass accuracy, and extensive residue cleavage by use of positive electrospray ionization 21 Tesla Fourier transform ion cyclotron resonance-tandem mass spectrometry (21 T FT-ICR MS/MS) for hemoglobin (Hb) variant de novo sequencing and β-thalassemia diagnosis.RESULTS: We correctly identified all Hb variants in blind analysis of 18 samples, including the first characterization of homozygous Hb Himeji variant. In addition, an Hb heterozygous variant with isotopologue mass spacing as small as 0.0194 Da (Hb AD) was resolved in both precursor ion mass spectrum (MS1) and product ion mass spectrum (MS2). In blind analysis, we also observed that the abundance ratio between intact δ and β subunits (δ/β) or the abundance ratio between intact δ and α subunits (δ/α) could serve to diagnose β-thalassemia trait caused by a mutation in 1 HBB gene.CONCLUSIONS: We found that 21 T FT-ICR MS/MS provides a benchmark for top-down MS/MS analysis of blood Hb. The present method has the potential to be translated to lower resolving power mass spectrometers (lower field FT-ICR mass spectrometry and Orbitrap) for Hb variant analysis (by MS1 and MS2) and β-thalassemia diagnosis (MS1).© 2019 American Association for Clinical Chemistry.

Check out the article’s website on Pubmed for more information:

[link-preview url=https://www.ncbi.nlm.nih.gov/pubmed/31040099 forceshot=true]

This article is a good source of information and a good way to become familiar with topics such as: n/a.

New Chemicals from MOLECULAR DEPOT

New Proteins from MOLECULAR DEPOT


New Antibodies from MOLECULAR DEPOT


New Research Kits from MOLECULAR DEPOT