Abstract
Major histocompatibility complex class I molecules (MHC-I) are expressed at the cell surface and are responsible for the presentation of self and non-self antigen repertoires to the immune system. Eutherian mammals express both classical and non-classical MHC-I molecules in the placenta, the latter of which are thought to modulate the maternal immune response during pregnancy. Marsupials last shared a common ancestor with eutherian mammals such as humans and mice over 160 million years ago. Since, like eutherians, they have an intra-uterine development dependent on a placenta, albeit a short-lived and less invasive one, they provide an opportunity to investigate the evolution of MHC-I expression at the fetal-maternal interface. We have characterised MHC-I mRNA expression in reproductive tissues of the tammar wallaby (Macropus eugenii) from the time of placental attachment to day 25 of the 26.5 day pregnancy. Putative classical MHC-I genes were expressed in the choriovitelline placenta, fetus, and gravid endometrium throughout the whole of this period. The MHC-I classical sequences were phylogenetically most similar to the Maeu-UC (50/100 clones) and Maeu-UA genes (7/100 clones). Expression of three non-classical MHC-I genes (Maeu-UD, Maeu-UK and Maeu-UM) were also present in placental samples. The results suggest that expression of classical and non-classical MHC-I genes in extant marsupial and eutherian mammals may have been necessary for the evolution of the ancestral therian placenta and survival of the mammalian fetus at the maternal-fetal interface.
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Abbreviations
- MHC-I:
-
Major histocompatibility complex class I
- PBR:
-
Protein binding region
- α1/2:
-
Alpha 1 and 2 domain
- BOM:
-
Bilaminar omphalopleure
- TOM:
-
Trilaminar omphalopleure
- cDNA:
-
Complimentary DNA
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Acknowledgments
Many thanks to Mrs. Jette Ziep and Ms Tanja Noventa for assistance in the laboratory and to Prof. Joerns Fickel for technical assistance with DNA sequencing. This project was funded by a PAKT grant from the Leibniz Gemeinschaft to BD, a Humboldt Postdoctoral Fellowship to BRM, an Australian Research Council Discovery Outstanding Research Award to MBR. Thank you to the Dahlem Research School for supporting this research with a travel grant to Mrs. Ina Buentjen.
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The authors declare that they have no conflict of interest.
Authors’ contributions
BD, TBH, MBR and BRM designed the project. BRM and MBR collected and extracted the RNA from tammar wallaby placental tissues. IB isolated the sequences from tammar placenta and performed and checked PCR transcripts. SRF recapitulated all class I genes from published BAC libraries using bioinformatic resources and assisted with phylogenetic analysis and universal -UM primer design. All authors edited and approved the final manuscript.
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Online Resource 1
Amino acid sequence comparison of tammar Maeu-UD like transcripts. Maeu-UD transcripts were present in placental tissue at days 18, 21 and 25 of pregnancy and were 99.87 % identical to the Maeu-UD gene (two nucleotide differences: yellow boxes). A single liver transcript also grouped with the Maeu-UD gene phylogenetically, but this sequence contained numerous nucleotide differences that encode 22 amino acid substitutions relative to Maeu-UD. The lack of variability in placental Maeu-UD transcripts from three different individuals suggests that the liver transcript is the product of an alternative gene. (PDF 246 kb)
Online Resource 2
Amino acid sequence comparison of marsupial MHC-I -UM genes. The MHC-I -UM gene is highly conserved in marsupials, sharing approximately 80 % amino acid identity between opossum, devil and wallaby. The α1 and α2 domains (underlined in red and blue, respectively) are particularly highly conserved and contain the protein-binding region that is normally highly polymorphic in classical MHC-I genes. The cysteine residue in the α1 domain (yellow box), identified as an unpaired cysteine in opossum, is also conserved in all marsupials. (PDF 150 kb)
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Buentjen, I., Drews, B., Frankenberg, S.R. et al. Characterisation of major histocompatibility complex class I genes at the fetal-maternal interface of marsupials. Immunogenetics 67, 385–393 (2015). https://doi.org/10.1007/s00251-015-0842-5
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DOI: https://doi.org/10.1007/s00251-015-0842-5