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Serum IgM heavy chain sub-isotypes and light chain variants revealed in giant grouper (Epinephelus lanceolatus) via protein A affinity purification, mass spectrometry and genome sequencing. | LitMetric

AI Article Synopsis

Article Abstract

Two IgM heavy (H) chain sub-isotypes (80 and 40 kDa) and two light (L) chain variants (25 and 30 kDa) were detected in the serum of giant grouper (Epinephelus lanceolatus), purified by ammonium sulphate precipitation followed by protein A affinity chromatography. This method yielded 5.6 mg/mL high purity IgM from grouper serum, with efficiency estimated at 39.5% recovery from crude serum. The H and L chains were identified by SDS-PAGE and mass spectrometry (MS). Nanopore long-read sequencing was used to generate a genomic contig (MW768935), containing Cμ, Cδ loci, V regions, and a H chain Joining segment. cDNA sequencing of Cμ transcripts (MW768933 and MW768934) were used to polish the genomic contig and determine the exons and introns of the corresponding locus. MS peptide mapping revealed that the 80 kDa H chain consisted of C1-4 domains while peptides from the 40 kDa H chain only mapped to C1-2 domains. Our genomic contig showed the Cμ locus has a Cμ1-Cμ2-Cμ3-Cμ4 arrangement on the same strand as the other Ig loci identified in this genomic sequence. Our study corrects the NCBI annotations of the opposing Cμ loci (LOC117268697 and LOC117268550) in chromosome 16 (NC_047006). Further, we identified both κ and λ L chain isotypes in serum IgM. The molecular weight differences observed may result from different combinations of C and V genes. Putative IgM sub-isotypes have also been reported in Epinephelus itajara and Epinephelus coioides. The presence of IgM sub-isotypes may be a conserved trait among Epinephelus species.

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Source
http://dx.doi.org/10.1016/j.fsi.2021.03.014DOI Listing

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