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 21 aa and a mature IgL chain of 223 aa. 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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