dos Santos NM, Hermsen T, Rombout JH, Pilström L, Stet RJ. Ig light chain variability in DNP(494)-KLH immunised sea bass (Dicentrarchus labrax L.): evidence for intra-molecular induced suppression.
DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2001;
25:387-401. [PMID:
11356219 DOI:
10.1016/s0145-305x(01)00002-7]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The coding sequence of the sea bass light chain was obtained by sequential anchored PCR on a head kidney cDNA library of a DNP(494)-KLH immunised sea bass. The cDNA sequence obtained codes for a leader peptide of 21aa and a mature IgL chain of 223aa. Both the amino acid sequence comparisons and neighbour-joining trees showed that the IgL chain of sea bass obtained is of the L1/G type. To study the variability of the light chain, additional PCRs on the cDNA library and cDNA from pooled head kidneys were performed. Multiple alignment of unique sequences (N=17) could be performed without introducing gaps, and showed extremely low variability in CDR1, and no variability in CDR2 or CDR3. A possible explanation for this low variability of the IgL1 chain might be the enhanced expression of monospecific anti-DNP antibodies. The isolation and characterisation of partial genomic and cDNA IgL sequences, which showed normal variability, corroborate this explanation.
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