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. 2018 Aug 30;12:253. doi: 10.3389/fncel.2018.00253

Table 1.

Comparison of the main characteristics and functional properties of OR and IR-expressing neurons.

OSN type Co-receptor Latency of response Adaptation Adult sensory organ Sensory modality
OR-expressing neuron Yes (ORCO) (Larsson et al., 2004; Benton et al., 2006) 2 ms (Szyszka et al., 2014) Yes (Störtkuhl et al., 1999; Nagel and Wilson, 2011; Martelli et al., 2013; Cao et al., 2016) Antenna
Basiconic, Trichoid and Coeoloconic sensilla*
Palps
Basiconic sensilla (Couto et al., 2005)
Olfaction
Food odors (Hallem et al., 2004; Hallem and Carlson, 2006) Pheromones (Benton et al., 2007; Kurtovic et al., 2007; van der Goes van Naters and Carlson, 2007)
IR-expressing neuron Yes (IR25a, IR8a, IR76b, IR93a) (Benton et al., 2009; Abuin et al., 2011; Sánchez-Alcañiz et al., 2018) - No (Benton et al., 2009; Cao et al., 2016) Antenna,
Coecolonic sensilla, sacculus (Benton et al., 2009)
Olfaction
Food odors (Benton et al., 2009; Abuin et al., 2011; Silbering et al., 2011) Pheromones (Koh et al., 2014)
Labella Pharynx
Labral Sense Organ Dorsal Cibarial Sense Organ Ventral Cibarial Sense Organ
Leg Wing margin
(Koh et al., 2014; Sánchez-Alcañiz et al., 2018)
Taste
Polyamines (Hussain et al., 2016) Salt (Zhang et al., 2013; Lee et al., 2017, 2018) Aminoacids (Croset et al., 2016; Ganguly et al., 2017) Fatty acids (Ahn et al., 2017; Tauber et al., 2017) Sugar (Joseph et al., 2017) Carbonation (Sánchez-Alcañiz et al., 2018)
Antenna,
sacculus and arista (Benton et al., 2009)
Hygrosensation
(Enjin et al., 2016; Knecht et al., 2016, 2017)
Temperature sensing
(Knecht et al., 2016; Ni et al., 2016)

*Only one OR has been ascribed to coeloconic sensilla.