Olfactomedin-like 2 A and B (OLFML2A and OLFML2B) profile expression in the retina of spotted gar (Lepisosteus oculatus) and bioinformatics mining

  • María Lourdes Garza-Rodríguez
  • Rafael González-Álvarez
  • Roberto Eduardo Mendoza Alfaro
  • Diana Cristina Pérez-Ibave
  • Antonio Ali Perez-Maya
  • Maricela Luna-Muñoz
  • Karim Mohamed-Noriega
  • Carlos Arámburo-De-La-Hoz
  • Carlos Javier Aguilera González
  • Iram Pablo Rodriguez SanchezEmail author


Olfactomedin-like (OLFML) proteins are members of the olfactomedin domain–containing secreted glycoprotein (OLF) family. OLFML2A and OLFML2B are representative molecules of these glycoproteins. Olfactomedins are critical for the development and functional organization of the nervous system and retina, which is a highly conserved structure in vertebrates, having almost identical anatomical and physiological characteristics in multiple taxa. Spotted gar, a member of the Lepisosteidae family, is a freshwater fish that inhabits rivers, bayous, swamps, and brackish waters. Recently, the complete genome has been sequenced, providing a unique bridge between fish medical models to human biology, making it an excellent animal model. This study was aimed to understanding the evolution OLFML2A and OLFML2B in the retina of spotted gar through looking for the expression of these genes. Spotted gar retina was analyzed with hematoxylin-eosin staining assays to provide an overall view of the retina structure and an immunofluorescence assay to identify OLFML2A and OLFML2B protein expression. A phylogenetic tree was created using the neighbor-joining method. Forces that direct the evolution of the fish genes were tested. Spotted gar retina, as in other vertebrates, is made of several layers. OLFML2A and OLFML2B proteins were detected in the rod and cone photoreceptor layer (PRL), outer nuclear layer (ONL), and inner nuclear layer (INL). Phylogenetic tree analysis confirms the orthology within the OLFML2A gene. Purifying selection is the evolutionary force that directs the OLFML2A genes. OLFML2A genes have a well-conserved function over time and species.


Spotted gar Eye Retina Expression profile Evolution Olfactomedin 



The authors gratefully acknowledge the critical reading of the manuscript by Sergio Lozano-Rodriguez.

Funding information

The present work was supported by the grant number 16769 from the Mexican Council of Science and Technology, CONACYT.

Compliance with ethical standards

The experimental protocol was reviewed and approved by the Research Ethics Committee of the Faculty of Biological Sciences (approval number FCB-CB-701).


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • María Lourdes Garza-Rodríguez
    • 1
  • Rafael González-Álvarez
    • 2
  • Roberto Eduardo Mendoza Alfaro
    • 3
  • Diana Cristina Pérez-Ibave
    • 1
  • Antonio Ali Perez-Maya
    • 4
  • Maricela Luna-Muñoz
    • 5
  • Karim Mohamed-Noriega
    • 6
  • Carlos Arámburo-De-La-Hoz
    • 5
  • Carlos Javier Aguilera González
    • 3
  • Iram Pablo Rodriguez Sanchez
    • 7
    Email author
  1. 1.Universidad Autónoma de Nuevo León, Hospital Universitario “Dr. José Eleuterio González,” Servicio de OncologíaMonterreyMexico
  2. 2.Facultad de MedicinaUniversidad Autónoma de GuadalajaraZapopanMexico
  3. 3.Facultad de Ciencias Biológicas, Departamento de Ecología, Laboratorio de EcofisiologíaUniversidad Autónoma de Nuevo LeónSan Nicolás de los GarzaMexico
  4. 4.Universidad Autónoma de Nuevo León, Facultad de Medicina, Departamento de Bioquímica y Medicina MolecularMonterreyMexico
  5. 5.Instituo de Neurobiología, Departamento de Neurobiología Celular y MolecularUniversidad Nacional Autónoma de MéxicoJuriquillaMexico
  6. 6.Departamento de OftalmologíaUniversidad Autónoma de Nuevo León, Hospital Universitario “Dr. José Eleuterio González”MonterreyMexico
  7. 7.Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Laboratorio de Fisiología Molecular y EstructuralSan Nicolás de los GarzaMéxico

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