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Immunoglobulin heavy constant gamma gene evolution is modulated by both the divergent and birth-and-death evolutionary models

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Abstract

Immunoglobulin G (IgG) is one of the five antibody classes produced in mammals as part of the humoral responses accountable for protecting the organisms from infection. Its antibody heavy chain constant region is encoded by the Ig heavy-chain gamma gene (IGHG). In humans, there are fourIGHG genes which encode the four subclasses, each with a specialized effector function. Although four subclasses of IgG proteins have also been reported in macaques, this does not appear to be the rule for all primates. In Platyrrhini, IgG has been stated to be encoded by a single-copy gene. To date, it remains unknown how theIGHG has expanded or contracted in the primate order; consequently, we have analyzed data from 38 primate genome sequences to identifyIGHG genes and describe the evolution ofIGHG genes in primate order.IGHG belongs to a multigene family that evolves by the birth–death evolutionary model in primates. Whereas Strepsirrhini and Platyrrhini have a single-copy gene, in Catarrhini, it has expanded to several paralogs in their genomes; some deleted and others pseudogenized. Furthermore, episodic positive selection may have promoted a species-specific IgG effector function. We propose that IgG evolved to reach an optimal number of copies per genome to adapt their humoral immune responses to different environmental conditions. This study has implications for biomedical trials using non-human primates.

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Data availability

The datasets supporting this article’s results are available in Mendeley Data,https://doi.org/10.17632/r6vh2rfnts.1.

Abbreviations

Alpa :

Alouatta palliate

Aona :

Aotus nancymaae

Atge :

Ateles geoffroyi

Caja :

Callithrix jacchus

Ceal :

Cebus albifrons

Ceca :

Cebus capucinus

Ceat :

Cercocebus atys

Erpa :

Erythrocebus patas

Eufl :

Eulemur flavifrons

Eufu :

Eulemur fulvus

Euma :

Eulemur macaco

Gogo :

Gorilla gorilla

Hosa :

Homo sapiens

Inin :

Indri indri

Mafu :

Macaca fuscata

Mamu :

Macaca mulatta

Mane :

Macaca, nemestrina

Masp :

Mandrillus sphinx

Migr :

Microcebus griseorufus

Mimi :

Microcebus mittermeieri

Mimu :

Microcebus murines

Mira :

Microcebus ravelobensis

Mita :

Microcebus tavaratra

Miza :

Mirza zaza

Nala :

Nasalis larvatus

Patr :

Pan troglodytes

Pipi :

Pithecia pithecia

Pldo :

Plecturocebus donacophilus

Poab :

Pongo abelii

Prsi :

Prolemur simus

Prco :

Propithecus coquereli

Pyne :

Pygathrix nemaeus

Rhro :

Rhinopithecus roxellana

Saim :

Saguinus imperator

Sabo :

Saimiri boliviensis

Saap :

Sapajus paella

Thge :

Theropithecus gelada

Trfr :

Trachypithecus francoisi

References

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Acknowledgements

The authors wish to thank Gypsy Bonny Español for reviewing the manuscript.

Funding

This work was supported by the Fundación para la Promoción de la Investigación y la Tecnología [cooperation agreement #202111, 2021].

Author information

Authors and Affiliations

  1. PGAME-Population Genetics and Molecular Evolution, Fundación Scient, Tunja, Boyacá, Colombia

    Diego Garzón-Ospina & Sindy P. Buitrago

  2. GEBIMOL, School of Biological Sciences, Universidad Pedagógica y Tecnológica de Colombia-UPTC, Tunja, Boyacá, Colombia

    Diego Garzón-Ospina & Sindy P. Buitrago

  3. GEO, School of Biological Sciences, Universidad Pedagógica y Tecnológica de Colombia-UPTC, Tunja, Boyacá, Colombia

    Diego Garzón-Ospina & Sindy P. Buitrago

Authors
  1. Diego Garzón-Ospina
  2. Sindy P. Buitrago

Contributions

DG-O: Conceptualization, Investigation, Formal analysis, Methodology, Visualization, Writing—Original draft preparation, Acquiring funding. SPB: Investigation, Methodology, Visualization, Formal analysis, Writing—Reviewing and Editing.

Corresponding authors

Correspondence toDiego Garzón-Ospina orSindy P. Buitrago.

Ethics declarations

Conflict of interest

The authors declare that they have no competing financial interests that could have appeared to influence the work reported in this paper.

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Supplementary Information

Below is the link to the electronic supplementary material.

10329_2022_1019_MOESM3_ESM.tif

Supplementary file3 (TIF 1583 kb) Four major clades were identified clustering DNA sequences in agreement with primate phylogenetic relationships. The branching pattern shows posterior probabilities higher than > 0.95 (numbers on branches) supporting the topology. Purple clade cluster the StrepsirrhiniIGHG gene sequences; red clade put together Platyrrhini genes; yellow clade group Cercopithecoidea paralogs and the clade clusteringIGHG duplicates from Hominoidea are depicted in blue

10329_2022_1019_MOESM4_ESM.tif

Supplementary file4 (TIF 2059 kb) Four major clades were identified clustering amino acid sequences in agreement with primate phylogenetic relationships. The branching pattern shows posterior probabilities higher than > 0.95 (numbers on branches) supporting the topology. Purple clade cluster the Strepsirrhini IgG protein sequences; red clade put together Platyrrhini genes; yellow clade group Cercopithecoidea paralogs and the clade clusteringIGHG duplicates from Hominoidea are depicted in blue

10329_2022_1019_MOESM5_ESM.tif

Supplementary file5 (TIF 2270 kb) IgG tree inferred by evolving down the species tree. Numbers on branches are posterior probability values. Purple clade cluster the Strepsirrhini IgG protein sequences; red clade put together Platyrrhini genes; yellow clade group Cercopithecoidea paralogs and the clade clusteringIGHG duplicates from Hominoidea are depicted in blue. Both BY and DLTRS trees showed similar topologies using DNA or proteins sequences

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Garzón-Ospina, D., Buitrago, S.P. Immunoglobulin heavy constant gamma gene evolution is modulated by both the divergent and birth-and-death evolutionary models.Primates63, 611–625 (2022). https://doi.org/10.1007/s10329-022-01019-8

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