Independent losses of visual perception genes Gja10 and Rbp3 in echolocating bats (Order Chiroptera)

Bin Shen, Tao Fang, Mengyao Dai, Gareth Jones*, Shuyi Zhang

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

11 Citations (Scopus)
257 Downloads (Pure)

Abstract

A trade-off between the sensory modalities of vision and hearing is likely to have occurred in echolocating bats as the sophisticated mechanism of laryngeal echolocation requires considerable neural processing and has reduced the reliance of echolocating bats on vision for perceiving the environment. If such a trade-off exists, it is reasonable to hypothesize that some genes involved in visual function may have undergone relaxed selection or even functional loss in echolocating bats. The Gap junction protein, alpha 10 (Gja10, encoded by Gja10 gene) is expressed abundantly in mammal retinal horizontal cells and plays an important role in horizontal cell coupling. The interphotoreceptor retinoid-binding protein (Irbp, encoded by the Rbp3 gene) is mainly expressed in interphotoreceptor matrix and is known to be critical for normal functioning of the visual cycle. We sequenced Gja10 and Rbp3 genes in a taxonomically wide range of bats with divergent auditory characteristics (35 and 18 species for Gja10 and Rbp3, respectively). Both genes have became pseudogenes in species from the families Hipposideridae and Rhinolophidae that emit constant frequency echolocation calls with Doppler shift compensation at high-duty-cycles (the most sophisticated form of biosonar known), and in some bat species that emit echolocation calls at low-duty-cycles. Our study thus provides further evidence for the hypothesis that a trade-off occurs at the genetic level between vision and echolocation in bats.

Original languageEnglish
Article numbere68867
Number of pages11
JournalPLoS ONE
Volume8
Issue number7
DOIs
Publication statusPublished - 18 Jul 2013

Keywords

  • RETINOID-BINDING PROTEIN
  • RELATIVE BRAIN SIZE
  • FRUIT-EATING BATS
  • DESMODUS-ROTUNDUS
  • VAMPIRE BAT
  • SOUND-LOCALIZATION
  • HORIZONTAL CELLS
  • MOLECULAR SYSTEMATICS
  • FUNCTIONAL EXPRESSION
  • MITOCHONDRIAL GENES

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