TAILIEUCHUNG - Báo cáo khoa hoc : Rapid copy number expansion and recent recruitment of domains in S-receptor kinase-like genes contribute to the origin of self-incompatibility

More than half of flowering plants have a sophisticated mechanism for self-pollen rejection, named self-incompatibility. In the Brassicaceae family, the recognition specificity of a self-incompatibility system is achieved by the interaction of the stigmatic S-receptor kinase and its ligand S-locus cys-teine-rich protein, which are encoded by two tightly linked polymorphic genes. | IFEBS Journal Rapid copy number expansion and recent recruitment of domains in S-receptor kinase-like genes contribute to the origin of self-incompatibility Xiaohui Zhang Long Wang Yang Yuan Dacheng Tian and Sihai Yang State Key Laboratory of PharmaceuticalBiotechnology Schoolof Life Sciences Nanjing University China Keywords co-evolution copy number expansion origin recruitment of domains SRK-based self-incompatibility Correspondence S. Yang or D. Tian Department of Biology Schoolof Life Sciences Nanjing University 210093 Nanjing China Fax 86 25 83686406 Tel 86 25 83686406 E-mail sihaiyang@ dtian@ These authors contributed equally to this work Received 19 June 2011 revised 4 September 2011 accepted 8 September 2011 doi More than half of flowering plants have a sophisticated mechanism for self-pollen rejection named self-incompatibility. In the Brassicaceae family the recognition specificity of a self-incompatibility system is achieved by the interaction of the stigmatic S-receptor kinase and its ligand S-locus cysteine-rich protein which are encoded by two tightly linked polymorphic genes. During the last two decades many studies have explored their functions although their origin and evolutionary history have still not been elucidated clearly. In the present study an extensive survey in nine wholegenome sequenced plants including one moss one fern and seven flowering plants was conducted to clarify these issues. The data obtained showed that S_locus_glycop domain-related genes which are land plant specific have an ancient origin that can be traced back to early land plants and also have a significantly expansion in flowering plants. In the four predominant domain architectures Types I to IV of these proteins Type III genes had absolute predominance and appeared to be raw materials for diversification of the S_locus_glycop domain-related genes by frequent domain re-organizations. S-receptor kinase-like sequences

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