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Zimmermann W, Kammerer R. The immune-modulating pregnancy-specific glycoproteins evolve rapidly and their presence correlates with hemochorial placentation in primates. BMC Genomics 2021; 22:128. [PMID: 33602137 PMCID: PMC7893922 DOI: 10.1186/s12864-021-07413-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 01/27/2021] [Indexed: 12/14/2022] Open
Abstract
Background Pregnancy-specific glycoprotein (PSG) genes belong to the carcinoembryonic antigen (CEA) gene family, within the immunoglobulin gene superfamily. In humans, 10 PSG genes encode closely related secreted glycoproteins. They are exclusively expressed in fetal syncytiotrophoblast cells and represent the most abundant fetal proteins in the maternal blood. In recent years, a role in modulation of the maternal immune system possibly to avoid rejection of the semiallogeneic fetus and to facilitate access of trophoblast cells to maternal resources via the blood system has been suggested. Alternatively, they could serve as soluble pathogen decoy receptors like other members of the CEA family. Despite their clearly different domain organization, similar functional properties have also been observed for murine and bat PSG. As these species share a hemochorial type of placentation and a seemingly convergent formation of PSG genes during evolution, we hypothesized that hemochorial placentae support the evolution of PSG gene families. Results To strengthen this hypothesis, we have analyzed PSG genes in 57 primate species which exhibit hemochorial or epitheliochorial placentation. In nearly all analyzed apes some 10 PSG genes each could be retrieved from genomic databases, while 6 to 24 PSG genes were found in Old World monkey genomes. Surprisingly, only 1 to 7 PSG genes could be identified in New World monkeys. Interestingly, no PSG genes were found in more distantly related primates with epitheliochorial placentae like lemurs and lorises. The exons encoding the putative receptor-binding domains exhibit strong selection for diversification in most primate PSG as revealed by rapid loss of orthologous relationship during evolution and high ratios of nonsynonymous and synonymous mutations. Conclusion The distribution of trophoblast-specific PSGs in primates and their pattern of selection supports the hypothesis that PSG are still evolving to optimize fetal-maternal or putative pathogen interactions in mammals with intimate contact of fetal cells with the immune system of the mother like in hemochorial placentation. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-021-07413-8.
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Affiliation(s)
- Wolfgang Zimmermann
- Tumor Immunology Laboratory, LIFE Center, Department of Urology, University Hospital, LMU Munich, Germany.
| | - Robert Kammerer
- Institute of Immunology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald, Insel Riems, Germany
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2
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Moreira DA, Lamarca AP, Soares RF, Coelho AMA, Furtado C, Scherer NM, Moreira MAM, Seuánez HN, Boroni M. Transcriptome of the Southern Muriqui Brachyteles arachnoides (Primates:Platyrrhini), a Critically Endangered New World Monkey: Evidence of Adaptive Evolution. Front Genet 2020; 11:831. [PMID: 32849820 PMCID: PMC7412869 DOI: 10.3389/fgene.2020.00831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 07/09/2020] [Indexed: 12/03/2022] Open
Abstract
The southern muriqui (Brachyteles arachnoides) is the largest neotropical primate. This species is endemic to Brazil and is currently critically endangered due to its habitat destruction. The genetic basis underlying adaptive traits of New World monkeys has been a subject of interest to several investigators, with significant concern about genes related to the immune system. In the absence of a reference genome, RNA-seq and de novo transcriptome assembly have proved to be valuable genetic procedures for accessing gene sequences and testing evolutionary hypotheses. We present here a first report on the sequencing, assembly, annotation and adaptive selection analysis for thousands of transcripts of B. arachnoides from two different samples, corresponding to 13 different blood cells and fibroblasts. We assembled 284,283 transcripts with N50 of 2,940 bp, with a high rate of complete transcripts, with a median high scoring pair coverage of 88.2%, including low expressed transcripts, accounting for 72.3% of complete BUSCOs. We could predict and extract 81,400 coding sequences with 79.8% of significant BLAST hit against the Euarchontoglires SwissProt dataset. Of these 64,929 sequences, 34,084 were considered homologous to Supraprimate proteins, and of the remaining sequences (30,845), 94% were associated with a protein domain or a KEGG Orthology group, indicating potentially novel or specific protein-coding genes of B. arachnoides. We use the predicted protein sequences to perform a comparative analysis with 10 other primates. This analysis revealed, for the first time in an Atelid species, an expansion of APOBEC3G, extending this knowledge to all NWM families. Using a branch-site model, we searched for evidence of positive selection in 4,533 orthologous sets. This evolutionary analysis revealed 132 amino acid sites in 30 genes potentially evolving under positive selection, shedding light on primate genome evolution. These genes belonged to a wide variety of categories, including those encoding the innate immune system proteins (APOBEC3G, OAS2, and CEACAM1) among others related to the immune response. This work generated a set of thousands of complete sequences that can be used in other studies on molecular evolution and may help to unveil the evolution of primate genes. Still, further functional studies are required to provide an understanding of the underlying evolutionary forces modeling the primate genome.
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Affiliation(s)
- Daniel A Moreira
- Laboratory of Bioinformatics and Computational Biology, Division of Experimental and Translational Research, Brazilian National Cancer Institute (INCA), Rio de Janeiro, Brazil
| | - Alessandra P Lamarca
- Laboratory of Bioinformatics and Molecular Evolution, Department of Genetics, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Rafael Ferreira Soares
- Laboratory for Functional Genomics and Bioinformatics, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro, Brazil
| | - Ana M A Coelho
- Department of Genetics, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Carolina Furtado
- Genetics Program, Division of Experimental and Translational Research, Brazilian National Cancer Institute (INCA), Rio de Janeiro, Brazil
| | - Nicole M Scherer
- Laboratory of Bioinformatics and Computational Biology, Division of Experimental and Translational Research, Brazilian National Cancer Institute (INCA), Rio de Janeiro, Brazil
| | - Miguel A M Moreira
- Genetics Program, Division of Experimental and Translational Research, Brazilian National Cancer Institute (INCA), Rio de Janeiro, Brazil
| | - Hector N Seuánez
- Genetics Program, Division of Experimental and Translational Research, Brazilian National Cancer Institute (INCA), Rio de Janeiro, Brazil
| | - Mariana Boroni
- Laboratory of Bioinformatics and Computational Biology, Division of Experimental and Translational Research, Brazilian National Cancer Institute (INCA), Rio de Janeiro, Brazil
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3
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Hänske J, Hammacher T, Grenkowitz F, Mansfeld M, Dau TH, Maksimov P, Friedrich C, Zimmermann W, Kammerer R. Natural selection supports escape from concerted evolution of a recently duplicated CEACAM1 paralog in the ruminant CEA gene family. Sci Rep 2020; 10:3404. [PMID: 32099040 PMCID: PMC7042247 DOI: 10.1038/s41598-020-60425-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 01/31/2020] [Indexed: 11/24/2022] Open
Abstract
Concerted evolution is often observed in multigene families such as the CEA gene family. As a result, sequence similarity of paralogous genes is significantly higher than expected from their evolutionary distance. Gene conversion, a “copy paste” DNA repair mechanism that transfers sequences from one gene to another and homologous recombination are drivers of concerted evolution. Nevertheless, some gene family members escape concerted evolution and acquire sufficient sequence differences that orthologous genes can be assigned in descendant species. Reasons why some gene family members can escape while others are captured by concerted evolution are poorly understood. By analyzing the entire CEA gene family in cattle (Bos taurus) we identified a member (CEACAM32) that was created by gene duplication and cooption of a unique transmembrane domain exon in the most recent ancestor of ruminants. CEACAM32 shows a unique, testis-specific expression pattern. Phylogenetic analysis indicated that CEACAM32 is not involved in concerted evolution of CEACAM1 paralogs in ruminants. However, analysis of gene conversion events revealed that CEACAM32 is subject to gene conversion but remarkably, these events are found in the leader exon and intron sequences but not in exons coding for the Ig-like domains. These findings suggest that natural selection hinders gene conversion affecting protein sequences of the mature protein and thereby support escape of CEACAM32 from concerted evolution.
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Affiliation(s)
- Jana Hänske
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany.,Landesuntersuchungsanstalt für das Gesundheits- und Veterinärwesen Sachsen, Dresden, Germany
| | - Tim Hammacher
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany
| | - Franziska Grenkowitz
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany
| | - Martin Mansfeld
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany
| | - Tung Huy Dau
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany
| | - Pavlo Maksimov
- Institute of Epidemiology, Friedrich-Loeffler-Institute, Greifswald - InselRiems, Germany
| | - Christin Friedrich
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany.,Institute of Systems Immunology, University of Würzburg, Würzburg, Germany
| | - Wolfgang Zimmermann
- Tumor Immunology Laboratory, LIFE Center, Department of Urology, Ludwig-Maximilians-University, Munich, Germany
| | - Robert Kammerer
- Institute of Immunology, Friedrich-Loeffler-Institute, Greifswald - Insel Riems, Germany.
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Marete A, Sahana G, Fritz S, Lefebvre R, Barbat A, Lund MS, Guldbrandtsen B, Boichard D. Genome-wide association study for milking speed in French Holstein cows. J Dairy Sci 2018; 101:6205-6219. [PMID: 29705414 DOI: 10.3168/jds.2017-14067] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 03/16/2018] [Indexed: 01/01/2023]
Abstract
Using a combination of data from the BovineSNP50 BeadChip SNP array (Illumina, San Diego, CA) and a EuroGenomics (Amsterdam, the Netherlands) custom single nucleotide polymorphism (SNP) chip with SNP pre-selected from whole genome sequence data, we carried out an association study of milking speed in 32,491 French Holstein dairy cows. Milking speed was measured by a score given by the farmer. Phenotypes were yield deviations as obtained from the French evaluation system. They were analyzed with a linear mixed model for association studies. We identified SNP on 22 chromosomes significantly associated with milking speed. As clinical mastitis and somatic cell score have an unfavorable genetic correlation with milking speed, we tested whether the most significant SNP on these 22 chromosomes associated with milking speed were also associated with clinical mastitis or somatic cell score. Nine hundred seventy-one genome-wide significant SNP were associated with milking speed. Of these, 86 were associated with clinical mastitis and 198 with somatic cell score. The most significant association signals for milking speed were observed on chromosomes 7, 8, 10, 14, and 18. The most significant signal was located on chromosome 14 (ZFAT gene). Eleven novel milking speed quantitative trait loci (QTL) were observed on chromosomes 7, 10, 11, 14, 18, 25, and 26. Twelve candidate SNP for milking speed mapped directly within genes. Of these, 10 were QTL lead SNP, which mapped within the genes HMHA1, POLR2E, GNB5, KLHL29, ZFAT, KCNB2, CEACAM18, CCL24, and LHPP. Limited pleiotropy was observed between milking speed QTL and clinical mastitis.
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Affiliation(s)
- Andrew Marete
- INRA, UMR 1313 GABI, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France; Aarhus University, Center for Quantitative Genetics and Genomics, 8830 Tjele, Denmark.
| | - Goutam Sahana
- Aarhus University, Center for Quantitative Genetics and Genomics, 8830 Tjele, Denmark
| | - Sébastien Fritz
- INRA, UMR 1313 GABI, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France; ALLICE, 75595 Paris, France
| | - Rachel Lefebvre
- INRA, UMR 1313 GABI, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Anne Barbat
- INRA, UMR 1313 GABI, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Mogens Sandø Lund
- Aarhus University, Center for Quantitative Genetics and Genomics, 8830 Tjele, Denmark
| | - Bernt Guldbrandtsen
- Aarhus University, Center for Quantitative Genetics and Genomics, 8830 Tjele, Denmark
| | - Didier Boichard
- INRA, UMR 1313 GABI, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
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5
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Mißbach S, Aleksic D, Blaschke L, Hassemer T, Lee KJ, Mansfeld M, Hänske J, Handler J, Kammerer R. Alternative splicing after gene duplication drives CEACAM1-paralog diversification in the horse. BMC Evol Biol 2018; 18:32. [PMID: 29544443 PMCID: PMC5856374 DOI: 10.1186/s12862-018-1145-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 03/02/2018] [Indexed: 02/03/2023] Open
Abstract
Background The CEA gene family is one of the most rapidly evolving gene families in the human genome. The founder gene of the family is thought to be an ancestor of the inhibitory immune checkpoint molecule CEACAM1. Comprehensive analyses of mammalian genomes showed that the CEA gene family is subject to tremendous gene family expansion and contraction events in different mammalian species. While in some species (e.g. rabbits) less than three CEACAM1 related genes exist, were in others (certain microbat species) up to 100 CEACAM1 paralogs identified. We have recently reported that the horse has also an extended CEA gene family. Since mechanisms of gene family expansion and diversification are not well understood we aimed to analyze the equine CEA gene family in detail. Results We found that the equine CEA gene family contains 17 functional CEACAM1-related genes. Nine of them were secreted molecules and eight CEACAMs contain transmembrane and cytoplasmic domain exons, the latter being in the focus of the present report. Only one (CEACAM41) gene has exons coding for activating signaling motifs all other CEACAM1 paralogs contain cytoplasmic exons similar to that of the inhibitory receptor CEACAM1. However, cloning of cDNAs showed that only one CEACAM1 paralog contain functional immunoreceptor tyrosine-based inhibitory motifs in its cytoplasmic tail. Three receptors have acquired a stop codon in the transmembrane domain and two have lost their inhibitory motifs due to alternative splicing events. In addition, alternative splicing eliminated the transmembrane exon sequence of the putative activating receptor, rendering it to a secreted molecule. Transfection of eukaryotic cells with FLAG-tagged alternatively spliced CEACAMs indicates that they can be expressed in vivo. Thus detection of CEACAM41 mRNA in activated PBMC suggests that CEACAM41 is secreted by lymphoid cells upon activation. Conclusions The results of our study demonstrate that alternative splicing after gene duplication is a potent mechanism to accelerate functional diversification of the equine CEA gene family members. This potent mechanism has created novel CEACAM receptors with unique signaling capacities and secreted CEACAMs which potentially enables equine lymphoid cells to control distantly located immune cells.
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Affiliation(s)
- Sophie Mißbach
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany.,Plattform Degenerative Erkrankungen, Deutsches Primatenzentrum GmbH, Goettingen, Germany
| | - Denis Aleksic
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany
| | - Lisa Blaschke
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany
| | - Timm Hassemer
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany.,Department of Cellular Biochemistry, Max-Planck-Institute of Biochemistry, Martinsried, Germany
| | - Kyung Jin Lee
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Martin Mansfeld
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany
| | - Jana Hänske
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany
| | - Johannes Handler
- Clinic for Horses, Veterinary Faculty, Freie Universität Berlin, Oertzenweg 19b, D-14163, Berlin, Germany
| | - Robert Kammerer
- Institute of Immunology, Friedrich-Loeffler-Institut, Suedufer 10, Greifswald, Insel Riems, Germany. .,Friedrich-Loeffler-Institut, Bundesforschungsinstitut für Tiergesundheit, Federal Research Institute for Animal Health, Südufer 10, D, 17493, Greifswald, Insel Riems, Germany.
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6
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Kammerer R, Mansfeld M, Hänske J, Mißbach S, He X, Köllner B, Mouchantat S, Zimmermann W. Recent expansion and adaptive evolution of the carcinoembryonic antigen family in bats of the Yangochiroptera subgroup. BMC Genomics 2017; 18:717. [PMID: 28893191 PMCID: PMC5594555 DOI: 10.1186/s12864-017-4106-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 09/01/2017] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Expansions of gene families are predictive for ongoing genetic adaptation to environmental cues. We describe such an expansion of the carcinoembryonic antigen (CEA) gene family in certain bat families. Members of the CEA family in humans and mice are exploited as cellular receptors by a number of pathogens, possibly due to their function in immunity and reproduction. The CEA family is composed of CEA-related cell adhesion molecules (CEACAMs) and secreted pregnancy-specific glycoproteins (PSGs). PSGs are almost exclusively expressed by trophoblast cells at the maternal-fetal interface. The reason why PSGs exist only in a minority of mammals is still unknown. RESULTS Analysis of the CEA gene family in bats revealed that in certain bat families, belonging to the subgroup Yangochiroptera but not the Yinpterochiroptera subgroup an expansion of the CEA gene family took place, resulting in approximately one hundred CEA family genes in some species of the Vespertilionidae. The majority of these genes encode secreted PSG-like proteins (further referred to as PSG). Remarkably, we found strong evidence that the ligand-binding domain (IgV-like domain) of PSG is under diversifying positive selection indicating that bat PSGs may interact with structurally highly variable ligands. Such ligands might represent bacterial or viral pathogen adhesins. We have identified two distinct clusters of PSGs in three Myotis species. The two PSG cluster differ in the amino acids under positive selection. One cluster was only expanded in members of the Vespertilionidae while the other was found to be expanded in addition in members of the Miniopteridae and Mormoopidae. Thus one round of PSG expansion may have occurred in an ancestry of all three families and a second only in Vespertilionidae. Although maternal ligands of PSGs may exist selective challenges by two distinct pathogens seem to be likely responsible for the expansion of PSGs in Vespertilionidae. CONCLUSIONS The rapid expansion of PSGs in certain bat species together with selection for diversification suggest that bat PSGs could be part of a pathogen defense system by serving as decoy receptors and/or regulators of feto-maternal interactions.
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Affiliation(s)
- Robert Kammerer
- Institute of Immunology, Friedrich-Loeffler Institute, -Insel Riems, Greifswald, Germany
| | - Martin Mansfeld
- Institute of Immunology, Friedrich-Loeffler Institute, -Insel Riems, Greifswald, Germany
| | - Jana Hänske
- Institute of Immunology, Friedrich-Loeffler Institute, -Insel Riems, Greifswald, Germany
| | - Sophie Mißbach
- Institute of Immunology, Friedrich-Loeffler Institute, -Insel Riems, Greifswald, Germany
- Plattform Degenerative Erkrankungen, Deutsches Primatenzentrum GmbH, Goettingen, Germany
| | - Xiaocui He
- Institute of Immunology, Friedrich-Loeffler Institute, -Insel Riems, Greifswald, Germany
- Department of Molecular Immunology, Max-Planck-Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Bernd Köllner
- Institute of Immunology, Friedrich-Loeffler Institute, -Insel Riems, Greifswald, Germany
| | - Susan Mouchantat
- Junior Research Group Wildlife Diseases, Friedrich-Loeffler-Institute, -Insel Riems, Greifswald, Germany
- Institute of Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Greifswald, Germany
| | - Wolfgang Zimmermann
- Tumor Immunology Laboratory, LIFE Center, University Clinic, Ludwig-Maximilians-University, Munich, Germany
- Department of Urology, University Clinic, Ludwig-Maximilians-University, Munich, Germany
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Peng G, Yang Y, Pasquarella JR, Xu L, Qian Z, Holmes KV, Li F. Structural and Molecular Evidence Suggesting Coronavirus-driven Evolution of Mouse Receptor. J Biol Chem 2016; 292:2174-2181. [PMID: 28035001 PMCID: PMC5313091 DOI: 10.1074/jbc.m116.764266] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/21/2016] [Indexed: 01/10/2023] Open
Abstract
Hosts and pathogens are locked in an evolutionary arms race. To infect mice, mouse hepatitis coronavirus (MHV) has evolved to recognize mouse CEACAM1a (mCEACAM1a) as its receptor. To elude MHV infections, mice may have evolved a variant allele from the Ceacam1a gene, called Ceacam1b, producing mCEACAM1b, which is a much poorer MHV receptor than mCEACAM1a. Previous studies showed that sequence differences between mCEACAM1a and mCEACAM1b in a critical MHV-binding CC′ loop partially account for the low receptor activity of mCEACAM1b, but detailed structural and molecular mechanisms for the differential MHV receptor activities of mCEACAM1a and mCEACAM1b remained elusive. Here we have determined the crystal structure of mCEACAM1b and identified the structural differences and additional residue differences between mCEACAM1a and mCEACAM1b that affect MHV binding and entry. These differences include conformational alterations of the CC′ loop as well as residue variations in other MHV-binding regions, including β-strands C′ and C′′ and loop C′C′′. Using pseudovirus entry and protein-protein binding assays, we show that substituting the structural and residue features from mCEACAM1b into mCEACAM1a reduced the viral receptor activity of mCEACAM1a, whereas substituting the reverse changes from mCEACAM1a into mCEACAM1b increased the viral receptor activity of mCEACAM1b. These results elucidate the detailed molecular mechanism for how mice may have kept pace in the evolutionary arms race with MHV by undergoing structural and residue changes in the MHV receptor, providing insight into this possible example of pathogen-driven evolution of a host receptor protein.
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Affiliation(s)
- Guiqing Peng
- From the Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455.,the State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Yang Yang
- From the Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455
| | - Joseph R Pasquarella
- From the Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455
| | - Liqing Xu
- From the Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455.,the Key Laboratory of Horticultural Plant Biology, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhaohui Qian
- the MOH Key Laboratory of Systems Biology of Pathogens, Institute of Pathogen Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China, and.,the Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado 80045
| | - Kathryn V Holmes
- the Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado 80045
| | - Fang Li
- From the Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455,
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8
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Zimmermann W, Kammerer R. Coevolution of paired receptors in Xenopus carcinoembryonic antigen-related cell adhesion molecule families suggests appropriation as pathogen receptors. BMC Genomics 2016; 17:928. [PMID: 27852220 PMCID: PMC5112662 DOI: 10.1186/s12864-016-3279-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 11/09/2016] [Indexed: 02/08/2023] Open
Abstract
Background In mammals, CEACAM1 and closely related members represent paired receptors with similar extracellular ligand-binding regions and cytoplasmic domains with opposing functions. Human CEACAM1 and CEACAM3 which have inhibitory ITIM/ITSM and activating ITAM-like motifs, respectively, in their cytoplasmic regions are such paired receptors. Various bacterial pathogens bind to CEACAM1 on epithelial and immune cells facilitating both entry into the host and down-regulation of the immune response whereas interaction with granulocyte-specific CEACAM3 leads to their uptake and destruction. It is unclear whether paired CEACAM receptors also exist in other vertebrate clades. Results We identified more than 80 ceacam genes in Xenopus tropicalis and X. laevis. They consist of two subgroups containing one or two putative paired receptor pairs each. Analysis of genomic sequences of paired receptors provide evidence that their highly similar ligand binding domains were adjusted by recent gene conversion events. In contrast, selection for diversification is observed among inhibitory receptor orthologs of the two frogs which split some 60 million years ago. The allotetraploid X. laevis arose later by hybridization of two closely related species. Interestingly, despite the conservation of the genomic landscape surrounding the homeologous ceacam loci only one locus resembles the one found in X. tropicalis. From the second X. laevis locus more than 80 % of the ceacam genes were lost including 5 of the 6 paired receptor genes. This suggests that once the gene for one of the paired receptors is lost the remaining gene cluster degrades rapidly probably due to lack of selection pressure exerted by pathogens. Conclusions The presence of paired receptors and selection for diversification suggests that also in amphibians CEACAM1-related inhibitory proteins are or were used as pathogen receptors. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-3279-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Wolfgang Zimmermann
- Tumor Immunology Laboratory, LIFE Center, University Clinic, Ludwig-Maximilians-University, Feodor-Lynen-Str. 19, 81377, Munich, Germany. .,Department of Urology, University Clinic, Ludwig-Maximilians-University, Marchioninistr. 15, 81377, Munich, Germany.
| | - Robert Kammerer
- Institute of Immunology, Friedrich-Loeffler Institut, 17493, Greifswald-Insel Riems, Germany
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9
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Aleksic D, Blaschke L, Mißbach S, Hänske J, Weiß W, Handler J, Zimmermann W, Cabrera-Sharp V, Read JE, de Mestre AM, O'Riordan R, Moore T, Kammerer R. Convergent evolution of pregnancy-specific glycoproteins in human and horse. Reproduction 2016; 152:171-84. [PMID: 27280409 DOI: 10.1530/rep-16-0236] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 06/07/2016] [Indexed: 01/13/2023]
Abstract
Pregnancy-specific glycoproteins (PSGs) are members of the carcinoembryonic antigen cell adhesion molecule (CEACAM) family that are secreted by trophoblast cells. PSGs may modulate immune, angiogenic and platelet responses during pregnancy. Until now, PSGs are only found in species that have a highly invasive (hemochorial) placentation including humans, mice and rats. Surprisingly, analyzing the CEACAM gene family of the horse, which has a non-invasive epitheliochorial placenta, with the exception of the transient endometrial cups, we identified equine CEACAM family members that seem to be related to PSGs of rodents and primates. We identified seven genes that encode secreted PSG-like CEACAMs Phylogenetic analyses indicate that they evolved independently from an equine CEACAM1-like ancestor rather than from a common PSG-like ancestor with rodents and primates. Significantly, expression of PSG-like genes (CEACAM44, CEACAM48, CEACAM49 and CEACAM55) was found in non-invasive as well as invasive trophoblast cells such as purified chorionic girdle cells and endometrial cup cells. Chorionic girdle cells are highly invasive trophoblast cells that invade the endometrium of the mare where they form endometrial cups and are in close contact with maternal immune cells. Therefore, the microenvironment of invasive equine trophoblast cells has striking similarities to the microenvironment of trophoblast cells in hemochorial placentas, suggesting that equine PSG-like CEACAMs and rodent and primate PSGs have undergone convergent evolution. This is supported by our finding that equine PSG-like CEACAM49 exhibits similar activity to certain rodent and human PSGs in a functional assay of platelet-fibrinogen binding. Our results have implications for understanding the evolution of PSGs and their functions in maternal-fetal interactions.
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Affiliation(s)
- Denis Aleksic
- Institute of ImmunologyFriedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Lisa Blaschke
- Institute of ImmunologyFriedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Sophie Mißbach
- Institute of ImmunologyFriedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Jana Hänske
- Institute of ImmunologyFriedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Wiebke Weiß
- Institute of ImmunologyFriedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Johannes Handler
- Equine Center Bad SaarowFreie Universität Berlin, Bad Saarow, Germany
| | - Wolfgang Zimmermann
- Tumor Immunology LaboratoryLudwig-Maximilians-University, Munich, Germany Department of UrologyUniversity Hospital, Munich, Germany
| | - Victoria Cabrera-Sharp
- Department of Comparative Biomedical SciencesThe Royal Veterinary College, University of London, London, UK
| | - Jordan E Read
- Department of Comparative Biomedical SciencesThe Royal Veterinary College, University of London, London, UK
| | - Amanda M de Mestre
- Department of Comparative Biomedical SciencesThe Royal Veterinary College, University of London, London, UK
| | - Ronan O'Riordan
- School of Biochemistry and Cell BiologyUniversity College Cork, Cork, Ireland
| | - Tom Moore
- School of Biochemistry and Cell BiologyUniversity College Cork, Cork, Ireland
| | - Robert Kammerer
- Institute of ImmunologyFriedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
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10
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Volovitz I, Melzer S, Amar S, Bocsi J, Bloch M, Efroni S, Ram Z, Tárnok A. Dendritic Cells in the Context of Human Tumors: Biology and Experimental Tools. Int Rev Immunol 2016; 35:116-35. [DOI: 10.3109/08830185.2015.1096935] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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11
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Kammerer R, Herse F, Zimmermann W. Convergent Evolution Within CEA Gene Families in Mammals: Hints for Species-Specific Selection Pressures. Evol Biol 2016. [DOI: 10.1007/978-3-319-41324-2_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Merkt W, Urlaub D, Meinke S, Kammerer R, Watzl C. Inhibition of NKp30- and 2B4-mediated NK cell activation by evolutionary different human and bovine CEACAM1 receptors. Eur J Immunol 2015; 45:2134-42. [PMID: 25824372 DOI: 10.1002/eji.201445151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 03/04/2015] [Accepted: 03/26/2015] [Indexed: 11/07/2022]
Abstract
Carcinoembryonicantigen-related cell adhesion molecule 1 (CEACAM1) is a receptor involved in the regulation of NK-cell function. In most species, the CEACAM1 cytoplasmic tail possesses a membrane-proximal ITIM paired with a membrane-distal immunoreceptor tyrosine-based switch motif (ITSM) signaling motif. Human CEACAM1 has phylogenetically relatively recently acquired a second ITIM instead of the ITSM and was shown to inhibit NKG2D-mediated NK-cell activation. Here, we compare the function of bovine and human CEACAM1. We show that in addition to NKG2D, human CEACAM1 can inhibit NK-cell activation via NKp30 or 2B4. Bovine CEACAM1, possessing an ITIM and an ITSM signaling motif, is also inhibitory. However, bovine CEACAM1 inhibition of NKp30-mediated lysis is less pronounced compared with its human counterpart. Bovine CEACAM1 inhibition is dependent on the membrane-proximal ITIM and our data suggest that also the membrane distal ITSM motif contributes to inhibitory signaling. Biochemically, human and bovine CEACAM1 can recruit the phosphatases SHP-1 and SHP-2 after receptor phosphorylation to a similar extend. Bovine CEACAM1 can additionally recruit the adapter molecule Ewing's sarcoma virus-activated transcript-2 (EAT-2), but not SLAM-associated protein (SAP). Taken together, we show that although human and bovine CEACAM1 are differentially equipped with ITIM and ITSM motifs, both receptors can inhibit NKp30 and 2B4 activation of NK cells.
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Affiliation(s)
- Wolfgang Merkt
- Institute for Immunology, University Heidelberg, Heidelberg, Germany.,Division of Rheumatology, Department of Internal Medicine V, University Hospital Heidelberg, Heidelberg, Germany
| | - Doris Urlaub
- Leibniz Research Center for Working Environment and Human Factors, Dortmund, Germany
| | - Stephan Meinke
- Institute for Immunology, University Heidelberg, Heidelberg, Germany.,Center for Hematology and Regenerative Medicine (HERM), Karolinska Institutet, Stockholm, Sweden
| | - Robert Kammerer
- Institute of Immunology, Friedrich-Loeffler Institute, Greifswald-Insel Riems, Germany
| | - Carsten Watzl
- Institute for Immunology, University Heidelberg, Heidelberg, Germany.,Leibniz Research Center for Working Environment and Human Factors, Dortmund, Germany
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13
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Tchoupa AK, Schuhmacher T, Hauck CR. Signaling by epithelial members of the CEACAM family - mucosal docking sites for pathogenic bacteria. Cell Commun Signal 2014; 12:27. [PMID: 24735478 PMCID: PMC4057559 DOI: 10.1186/1478-811x-12-27] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 03/24/2014] [Indexed: 11/22/2022] Open
Abstract
Carcinoembryonic antigen-related cell adhesion molecules (CEACAMs) comprise a group of immunoglobulin-related vertebrate glycoproteins. Several family members, including CEACAM1, CEA, and CEACAM6, are found on epithelial tissues throughout the human body. As they modulate diverse cellular functions, their signaling capacity is in the focus of current research. In this review we will summarize the knowledge about common signaling processes initiated by epithelial CEACAMs and suggest a model of signal transduction by CEACAM family members lacking significant cytoplasmic domains. As pathogenic and non-pathogenic bacteria exploit these receptors during mucosal colonization, we try to highlight the connection between CEACAMs, microbes, and cellular responses. Special emphasis in this context is placed on the functional interplay between CEACAMs and integrins that influences matrix adhesion of epithelial cells. The cooperation between these two receptor families provides an intriguing example of the fine tuning of cellular responses and their manipulation by specialized microorganisms.
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Affiliation(s)
| | | | - Christof R Hauck
- Lehrstuhl für Zellbiologie, Universität Konstanz, 78457 Konstanz, Germany.
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14
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Peng G, Xu L, Lin YL, Chen L, Pasquarella JR, Holmes KV, Li F. Crystal structure of bovine coronavirus spike protein lectin domain. J Biol Chem 2012; 287:41931-8. [PMID: 23091051 PMCID: PMC3516740 DOI: 10.1074/jbc.m112.418210] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The spike protein N-terminal domains (NTDs) of bovine coronavirus (BCoV) and mouse hepatitis coronavirus (MHV) recognize sugar and protein receptors, respectively, despite their significant sequence homology. We recently determined the crystal structure of MHV NTD complexed with its protein receptor murine carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1), which surprisingly revealed a human galectin (galactose-binding lectin) fold in MHV NTD. Here, we have determined at 1.55 Å resolution the crystal structure of BCoV NTD, which also has the human galectin fold. Using mutagenesis, we have located the sugar-binding site in BCoV NTD, which overlaps with the galactose-binding site in human galectins. Using a glycan array screen, we have identified 5-N-acetyl-9-O-acetylneuraminic acid as the preferred sugar substrate for BCoV NTD. Subtle structural differences between BCoV and MHV NTDs, primarily involving different conformations of receptor-binding loops, explain why BCoV NTD does not bind CEACAM1 and why MHV NTD does not bind sugar. These results suggest a successful viral evolution strategy in which coronaviruses stole a galectin from hosts, incorporated it into their spike protein, and evolved it into viral receptor-binding domains with altered sugar specificity in contemporary BCoV or novel protein specificity in contemporary MHV.
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Affiliation(s)
- Guiqing Peng
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA
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15
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Chapin C, Bailey NA, Gonzales LW, Lee JW, Gonzalez RF, Ballard PL. Distribution and surfactant association of carcinoembryonic cell adhesion molecule 6 in human lung. Am J Physiol Lung Cell Mol Physiol 2011; 302:L216-25. [PMID: 22037359 DOI: 10.1152/ajplung.00055.2011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Carcinoembryonic cell adhesion molecule 6 (CEACAM6) is a glycosylated, glycophosphatidylinositol-anchored protein expressed in epithelial cells of various primate tissues. It binds gram-negative bacteria and is overexpressed in human cancers. CEACAM6 is associated with lamellar bodies of cultured type II cells of human fetal lung and protects surfactant function in vitro. In this study, we characterized CEACAM6 expression in vivo in human lung. CEACAM6 was present in lung lavage of premature infants at birth and increased progressively in intubated infants with lung disease. Of surfactant-associated CEACAM6, ∼80% was the fully glycosylated, 90-kDa form that contains the glycophosphatidylinositol anchor, and the concentration (3.9% of phospholipid for adult lung) was comparable to that for surfactant proteins (SP)-A/B/C. We examined the affinity of CEACAM6 by purification of surfactant on density gradient centrifugation; concentrations of CEACAM6 and SP-B per phospholipid were unchanged, whereas levels of total protein and SP-A decreased by 60%. CEACAM6 mRNA content decreased progressively from upper trachea to peripheral fetal lung, whereas protein levels were similar in all regions of adult lung, suggesting proximal-to-distal developmental expression in lung epithelium. In adult lung, most type I cells and ∼50% of type II cells were immunopositive. We conclude that CEACAM6 is expressed by alveolar and airway epithelial cells of human lung and is secreted into lung-lining fluid, where fully glycosylated protein binds to surfactant. Production appears to be upregulated during neonatal lung disease, perhaps related to roles of CEACAM6 in surfactant function, cell proliferation, and innate immune defense.
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Affiliation(s)
- Cheryl Chapin
- Department of Pediatrics, University of California San Francisco, San Francisco, California, USA
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16
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CEACAM1 recognition by bacterial pathogens is species-specific. BMC Microbiol 2010; 10:117. [PMID: 20406467 PMCID: PMC2871271 DOI: 10.1186/1471-2180-10-117] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 04/20/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1), an immunoglobulin (Ig)-related glycoprotein, serves as cellular receptor for a variety of Gram-negative bacterial pathogens associated with the human mucosa. In particular, Neisseria gonorrhoeae, N. meningitidis, Moraxella catarrhalis, and Haemophilus influenzae possess well-characterized CEACAM1-binding adhesins. CEACAM1 is typically involved in cell-cell attachment, epithelial differentiation, neovascularisation and regulation of T-cell proliferation, and is one of the few CEACAM family members with homologues in different mammalian lineages. However, it is unknown whether bacterial adhesins of human pathogens can recognize CEACAM1 orthologues from other mammals. RESULTS Sequence comparisons of the amino-terminal Ig-variable-like domain of CEACAM1 reveal that the highest sequence divergence between human, murine, canine and bovine orthologues is found in the beta-strands comprising the bacteria-binding CC'FG-face of the Ig-fold. Using GFP-tagged, soluble amino-terminal domains of CEACAM1, we demonstrate that bacterial pathogens selectively associate with human, but not other mammalian CEACAM1 orthologues. Whereas full-length human CEACAM1 can mediate internalization of Neisseria gonorrhoeae in transfected cells, murine CEACAM1 fails to support bacterial internalization, demonstrating that the sequence divergence of CEACAM1 orthologues has functional consequences with regard to bacterial recognition and cellular invasion. CONCLUSIONS Our results establish the selective interaction of several human-restricted bacterial pathogens with human CEACAM1 and suggest that co-evolution of microbial adhesins with their corresponding receptors on mammalian cells contributes to the limited host range of these highly adapted infectious agents.
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17
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Kammerer R, Zimmermann W. Coevolution of activating and inhibitory receptors within mammalian carcinoembryonic antigen families. BMC Biol 2010; 8:12. [PMID: 20132533 PMCID: PMC2832619 DOI: 10.1186/1741-7007-8-12] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Accepted: 02/04/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Most rapidly evolving gene families are involved in immune responses and reproduction, two biological functions which have been assigned to the carcinoembryonic antigen (CEA) gene family. To gain insights into evolutionary forces shaping the CEA gene family we have analysed this gene family in 27 mammalian species including monotreme and marsupial lineages. RESULTS Phylogenetic analysis provided convincing evidence that the primordial CEA gene family in mammals consisted of five genes, including the immune inhibitory receptor-encoding CEACAM1 (CEA-related cell adhesion molecule) ancestor. Our analysis of the substitution rates within the nucleotide sequence which codes for the ligand binding domain of CEACAM1 indicates that the selection for diversification is, perhaps, a consequence of the exploitation of CEACAM1 by a variety of viral and bacterial pathogens as their cellular receptor. Depending on the extent of the amplification of an ancestral CEACAM1, the number of CEACAM1-related genes varies considerably between mammalian species from less than five in lagomorphs to more than 100 in bats. In most analysed species, ITAM (immunoreceptor tyrosine-based activation motifs) or ITAM-like motif-containing proteins exist which contain Ig-V-like, ligand binding domains closely related to that of CEACAM1. Human CEACAM3 is one such protein which can function as a CEACAM1 decoy receptor in granulocytes by mediating the uptake and destruction of specific bacterial pathogens via its ITAM-like motif. The close relationship between CEACAM1 and its ITAM-encoding relatives appears to be maintained by gene conversion and reciprocal recombination. Surprisingly, secreted CEACAMs resembling immunomodulatory CEACAM1-related trophoblast-specific pregnancy-specific glycoproteins (PSGs) found in humans and rodents evolved only in a limited set of mammals. The appearance of PSG-like genes correlates with invasive trophoblast growth in these species. CONCLUSIONS These phylogenetic studies provide evidence that pathogen/host coevolution and a possible participation in fetal-maternal conflict processes led to a highly species-specific diversity of mammalian CEA gene families.
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Affiliation(s)
- Robert Kammerer
- Tumor Immunology Laboratory, LIFE Center, Klinikum Grosshadern, Ludwig-Maximilians-University, Marchioninistrasse 23, 81377 Munich, Germany.
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18
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Kolla V, Gonzales LW, Bailey NA, Wang P, Angampalli S, Godinez MH, Madesh M, Ballard PL. Carcinoembryonic cell adhesion molecule 6 in human lung: regulated expression of a multifunctional type II cell protein. Am J Physiol Lung Cell Mol Physiol 2009; 296:L1019-30. [PMID: 19329538 DOI: 10.1152/ajplung.90596.2008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Carcinoembryonic cell adhesion molecule 6 (CEACAM6) is a glycosylated, glycosylphosphatidylinositol (GPI)-anchored protein expressed in epithelial cells of various human tissues. It binds gram-negative bacteria and is overexpressed in cancers, where it is antiapoptotic and promotes metastases. To characterize CEACAM6 expression in developing lung, we cultured human fetal lung epithelial cells and examined responses to differentiation-promoting hormones, adenovirus expressing thyroid transcription factor-1 (TTF-1), and silencing of TTF-1 with small inhibitory RNA. Glucocorticoid and cAMP had additive stimulatory effects on CEACAM6 content, and combined treatment maximally increased transcription rate, mRNA, and protein approximately 10-fold. Knockdown of TTF-1 reduced hormone induction of CEACAM6 by 80%, and expression of recombinant TTF-1 increased CEACAM6 in a dose-dependent fashion. CEACAM6 content of lung tissue increased during the third trimester and postnatally. By immunostaining, CEACAM6 was present in fetal type II cells, but not mesenchymal cells, and localized to both the plasma membrane and within surfactant-containing lamellar bodies. CEACAM6 was secreted from cultured type II cells and was present in both surfactant and supernatant fractions of infant tracheal aspirates. In functional studies, CEACAM6 reduced inhibition of surfactant surface properties by proteins in vitro and blocked apoptosis of electroporated cultured cells. We conclude that CEACAM6 in fetal lung epithelial cells is developmentally and hormonally regulated and a target protein for TTF-1. Because CEACAM6 acts as an antiapoptotic factor and stabilizes surfactant function, in addition to a putative role in innate defense against bacteria, we propose that it is a multifunctional alveolar protein.
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Affiliation(s)
- Venkatadri Kolla
- Department of Pediatrics , Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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19
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Kammerer R, Popp T, Härtle S, Singer BB, Zimmermann W. Species-specific evolution of immune receptor tyrosine based activation motif-containing CEACAM1-related immune receptors in the dog. BMC Evol Biol 2007; 7:196. [PMID: 17945019 PMCID: PMC2110893 DOI: 10.1186/1471-2148-7-196] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2007] [Accepted: 10/18/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Although the impact of pathogens on the evolution of the mammalian immune system is still under debate, proteins, which both regulate immune responses and serve as cellular receptors for pathogens should be at the forefront of pathogen-driven host evolution. The CEA (carcinoembryonic antigen) gene family codes for such proteins and indeed shows tremendous species-specific variation between human and rodents. Since little is known about the CEA gene family in other lineages of placental mammals, we expected to gain new insights into the evolution of the rapidly diverging CEA family by analyzing the CEA family of the dog. RESULTS Here we describe the complete CEA gene family in the dog. We found that the gene coding for the ITIM-bearing immunoregulatory molecule CEACAM1 gave rise to a recent expansion of the canine CEA gene family by gene duplication, similar to that previously found in humans and mice. However, while the murine and human CEACAMs (carcinoembryonic antigen-related cell adhesion molecules) are predominantly secreted and GPI-anchored, respectively, in the dog, most of the CEACAMs represent ITAM-bearing transmembrane proteins. One of these proteins, CEACAM28, exhibits nearly complete sequence identity with the ligand-binding N domain of CEACAM1, but antagonizing signaling motifs in the cytoplasmic tail. Comparison of nonsynonymous and synonymous substitutions indicates that the CEACAM28 N domain is under the strongest purifying selection of all canine CEACAM1-related CEACAMs. In addition, CEACAM28 shows a similar expression pattern in resting immune cells and tissues as CEACAM1. However, upon activation CEACAM28 mRNA and CEACAM1 mRNA are differentially regulated. CONCLUSION Thus, CEACAM1 and CEACAM28 are the first paired immune receptors identified within the CEA gene family, which are expressed on T cells and are most likely involved in the fine-tuning of T cell responses. The direction of gene conversion accompanied by purifying selection and expression in immune cells suggests the possibility that CEACAM28 evolved in response to selective pressure imposed by species-specific pathogens.
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Affiliation(s)
- Robert Kammerer
- Tumor Immunology Laboratory, LIFE Center, Klinikum Grosshadern, Ludwig-Maximilians-University, Marchioninistr, 23, 81377 Munich, Germany.
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20
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Naghibalhossaini F, Yoder AD, Tobi M, Stanners CP. Evolution of a tumorigenic property conferred by glycophosphatidyl-inositol membrane anchors of carcinoembryonic antigen gene family members during the primate radiation. Mol Biol Cell 2007; 18:1366-74. [PMID: 17287394 PMCID: PMC1838992 DOI: 10.1091/mbc.e06-10-0884] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
GPI membrane anchors of cell surface glycoproteins have been shown to confer functional properties that are different from their transmembrane (TM)-anchored counterparts. For the human carcinoembryonic antigen (CEA) family, a subfamily of the immunoglobulin superfamily, conversion of the mode of membrane linkage from TM to GPI confers radical changes in function: from tumor suppression or neutrality toward inhibition of differentiation and anoikis and distortion of tissue architecture, thereby contributing to tumorigenesis. We show here that GPI anchorage in the CEA family evolved twice independently in primates, very likely from more primitive TM anchors, by different packages of mutations. Both mutational packages, one package found in many primates, including humans, and a second, novel package found only in the Cebidae radiation of New World monkeys, give rise to efficiently processed GPI-linked proteins. Both types of GPI anchors mediate inhibition of cell differentiation. The estimated rate of nonsynonymous mutations (Ka) in the anchor-determining domain for conversion from TM to GPI anchorage in the CEA family that were fixed during evolution in these primates is 7 times higher than the average Ka in primates, indicating positive selection. These results suggest therefore that the functional changes mediated by CEA GPI anchors, including the inhibition of differentiation and anoikis, could be adaptive and advantageous.
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Affiliation(s)
| | - Anne D. Yoder
- Departments of Cell and Molecular Biology and Zoology, Northwestern University Medical School, Chicago, IL 60611
- Department of Zoology, Field Museum of Natural History, Chicago, IL 60605
| | - Martin Tobi
- Wayne State University, School of Medicine, Detroit VAMC, Detroit, MI 48201; and
| | - Clifford P. Stanners
- *McGill Cancer Centre and Department of Biochemistry, McGill University, Montréal, Québec, Canada H3G 1Y6
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Kuespert K, Pils S, Hauck CR. CEACAMs: their role in physiology and pathophysiology. Curr Opin Cell Biol 2006; 18:565-71. [PMID: 16919437 PMCID: PMC7127089 DOI: 10.1016/j.ceb.2006.08.008] [Citation(s) in RCA: 261] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2006] [Accepted: 08/03/2006] [Indexed: 12/24/2022]
Abstract
Carcinoembryonic antigen-related cell adhesion molecules (CEACAMs) belong to a group of mammalian immunoglobulin-related glycoproteins. They are involved in cell–cell recognition and modulate cellular processes that range from the shaping of tissue architecture and neovascularization to the regulation of insulin homeostasis and T-cell proliferation. CEACAMs have also been identified as receptors for host-specific viruses and bacteria in mice and humans, respectively, making these proteins an interesting example of pathogen–host co-evolution. Forward and reverse genetics in the mouse now provide powerful novel models to elucidate the action of CEACAM family members in vivo.
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22
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Zebhauser R, Kammerer R, Eisenried A, McLellan A, Moore T, Zimmermann W. Identification of a novel group of evolutionarily conserved members within the rapidly diverging murine Cea family. Genomics 2005; 86:566-80. [PMID: 16139472 DOI: 10.1016/j.ygeno.2005.07.008] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2005] [Revised: 06/15/2005] [Accepted: 07/11/2005] [Indexed: 01/30/2023]
Abstract
The carcinoembryonic antigen (CEA) family comprises a still actively evolving populous group of proteins that are involved in controlling tissue homeostasis, immune responses, and host/pathogen interactions. The genes identified to date in rodents and primates exhibit low sequence similarity and an extremely variable domain composition. Among the 22 murine Cea-related genes, only for Ceacam1 has an ortholog been assigned. To identify all CEA-related genes in mouse, rat, and human we undertook genome-wide analyses. Eight of 9 new expressible genes (Ceacam12-Ceacam20) could be located within the approximately 6.5-Mb murine Cea locus. Five of the genes were rodent-specific (Ceacam12-Ceacam15 and Ceacam17). Surprisingly, for the remaining 4 (Ceacam16 and Ceacam18-Ceacam20) orthologs could be detected in all three genomes at syntenic locations. Gene-specific reverse transcription/PCR analyses of total RNA from 31 murine adult, placental, and embryonic tissues as well as tumors revealed very distinct expression patterns, suggesting diversified functions within the CEA family.
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Affiliation(s)
- Roland Zebhauser
- Tumor Immunology Laboratory, Department of Urology, University Clinic Grosshadern, Ludwig-Maximilians-University München, Marchioninistrasse 23, D-81377 Munich, Germany
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