title: The genome-wide identification of mitogen-activated protein kinase kinase (MKK) genes in Yesso scallop Patinopecten yessoensis and their expression responses to bacteria challenges.
abstract: Mitogen-activated protein kinase kinases (MKK) are the essential components of the evolutionarily conserved MAPK signaling cascade, which regulates a variety of cellular activities and innate immune responses. Although MKK genes have been extensively studied in various vertebrate and invertebrate species, they have not been systematically characterized in bivalves. In this study, we identified and characterized five MKK genes (PyMKK1/2, PyMKK4, PyMKK5, PyMKK3/6 and PyMKK7) in the Yesso scallop (Patinopecten yessoensis). Phylogenetic and protein structural analyses were conducted to determine their identities and evolutionary relationships. To gain insights into the possible roles of MKK genes during scallop innate immune responses, quantitative real-time PCR (qRT-PCR) was used to investigate their expression profiles during different developmental stages in samples taken from healthy adult tissues and hemocytes after Micrococcus luteus and Vibrio anguillarum bacterial infections. The Yesso scallop MKKs (PyMKKs) were found to have highly conserved structural features compared to the MKK genes from other invertebrate species. Using qRT-PCR analysis, three distinct expression patterns were detected among the PyMKKs over the course of ten different developmental stages. In adult scallops, the majority of the PyMKKs were highly expressed in mantle, gill, muscle and hemocytes. The differential expression patterns of the five PyMKKs after M. luteus (Gram-positive) and V. anguillarum (Gram-negative) bacterial infections suggested their possible involvement in the innate immune response and provide the foundation and resource for the further study on innate immune response of MAPK signal pathway in mollusk.
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Jiajun
authors.initials: J
authors.lastname: Zou
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China. Electronic address: rjwang@ouc.edu.cn.
authors.forename: Ruijia
authors.initials: R
authors.lastname: Wang
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Ruojiao
authors.initials: R
authors.lastname: Li
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Kong
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Xianhui
authors.initials: X
authors.lastname: Ning
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Shi
authors.initials: S
authors.lastname: Wang
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China. Electronic address: hxl707@ouc.edu.cn.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Hu
authors.affiliation: Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
authors.forename: Zhenmin
authors.initials: Z
authors.lastname: Bao
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D016678:Genome; D007113:Immunity, Innate; D016982:Micrococcus luteus / Q000502:physiology*; D020929:Mitogen-Activated Protein Kinase Kinases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D049897:Pectinidae / Q000235:genetics* / Q000276:immunology* / Q000378:metabolism / Q000382:microbiology; D010802:Phylogeny; D017433:Protein Structure, Secondary; D060888:Real-Time Polymerase Chain Reaction; D016415:Sequence Alignment; D014733:Vibrio / Q000502:physiology*
chemical_list: D020929:Mitogen-Activated Protein Kinase Kinases
keywords: Innate immune; MAPK signaling cascade; MKK; Micrococcus luteus and Vibrio anguillarum infection; Patinopecten yessoensis