FN Archimer Export Format
PT J
TI Molecular diversity of antimicrobial effectors in the oyster Crassostrea gigas
BT 
AF SCHMITT, Paulina
   GUEGUEN, Yannick
   DESMARAIS, Erick
   BACHERE, Evelyne
   DE LORGERIL, Julien
AS 1:1;2:1,3;3:2;4:1;5:1;
FF 1:PDG-DOP-DCM-BOME-LALR;2:PDG-DOP-DCOP-AQUAPOL-LBQP;3:;4:PDG-DOP-DCM-BOME;5:PDG-DOP-DCM-BOME-LALR;
C1 Univ Montpellier 2, CNRS, UMR Ecosyst Lagunaires 5119, IFREMER,IRD, F-34095 Montpellier 5, France.
   Univ Montpellier 2, CNRS, UMR 5554, Inst Sci Evolut, F-34095 Montpellier, France.
   Ctr Oceanol Pacifique, IFREMER, Tahiti 98719, Fr Polynesia.
C2 UNIV MONTPELLIER, FRANCE
   UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
SI MONTPELLIER
   TAHITI
   PALAVAS
SE PDG-DOP-DCM-BOME-LALR
   PDG-DOP-DCOP-AQUAPOL-LBQP
   PDG-DOP-DCM-BOME
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.702
TC 50
UR https://archimer.ifremer.fr/doc/00001/11182/6691.pdf
LA English
DT Article
AB Background: To gain insight into the molecular diversity of antimicrobial peptides and proteins in the oyster Crassostrea gigas, we characterized and compared the sequence polymorphism of the antimicrobial peptides (AMPs), Cg-Defensins (Cg-Defs) and Cg-Proline Rich peptide (Cg-Prp), and of the bactericidal permeability increasing protein, Cg-BPI. For that, we analyzed genomic and transcript sequences obtained by specific PCR amplification and in silico searches. Results: High diversification among the three antimicrobial effectors was evidenced by this polymorphism survey. On the basis of sequence phylogenies, each AMP aggregates into clearly defined groups of variants and is the product of a multigenic family displaying a variety of gene structures. In contrast, Cg-bpi forms a single group and is encoded by a single gene copy. Moreover, we identified for both AMPs several genetic mechanisms of diversification such as recombination, parallel mutations leading to phylogenetic homoplasy and indel events. In addition, the non synonymous to synonymous substitutions ratio by codon (dN/dS) revealed several negatively and positively selected sites for both AMPs, suggesting that directional selection pressures have shaped their sequence variations. Conclusions: This study shows for the first time in a mollusc that antimicrobial peptides and proteins have been subject to distinct patterns of diversification and we evidence the existence of different evolutionary routes leading to such sequence variability.
PY 2010
PD JAN
SO Bmc Evolutionary Biology
SN 1471-2148
PU Biomed Central Ltd
VL 10
UT 000274623800001
DI 10.1186/1471-2148-10-23
ID 11182
ER

EF