This AOP is licensed under a Creative Commons Attribution 4.0 International License.
Inhibition of retinaldehyde dehydrogenase leads to population decline
- Young Jun Kim
|Author status||OECD status||OECD project||SAAOP status|
|Under Development: Contributions and Comments Welcome||Under Development||1.77||Included in OECD Work Plan|
This AOP was last modified on May 25, 2020 10:51
|Retinaldehyde dehydrogenase inhibition||May 22, 2019 05:03|
|Decreased optical elements of the eye||May 22, 2019 05:06|
|Decreased retinoic acid (RA) synthesis||May 22, 2019 05:10|
|Decreased plasma RA level||May 22, 2019 05:11|
|Increased visual impairment||May 22, 2019 05:12|
|Decrease, Population trajectory||September 26, 2017 11:33|
|Retinaldehyde dehydrogenase leads to retinoic acid||May 22, 2019 05:13|
|retinoic acid leads to plasma retionic acid||May 22, 2019 05:14|
|plasma retionic acid leads to Optical elements of the eye||May 22, 2019 05:14|
|Optical elements of the eye leads to Visual impairment||May 22, 2019 05:15|
|Visual impairment leads to Decrease, Population trajectory||May 25, 2020 10:50|
|Disulphiram||May 22, 2019 05:17|
|Diethylaminobenzaldehyde||May 22, 2019 05:17|
|Citral||May 22, 2019 05:18|
|Paclobutrazol||May 22, 2019 05:18|
|nitrofen||May 22, 2019 05:18|
|4-biphenyl carboxylic acid||May 22, 2019 05:18|
|Bisdiamine||May 22, 2019 05:19|
|SB-210661||May 22, 2019 05:19|
The present AOP is designed to estimate potential AO of fishes results from the retinaldehyde dehydrogenase (RALDH) inhibition. Visual impairment results from eye development of an embryonic cell might lead to population decline which is the potential endpoint. This AOP will provide a useful risk assessment tool for the toxic assessment of chemicals. Furthermore, this AOP can be applied to the prediction of eco-toxicity caused by the inhibition of RALDH.
This adverse outcome pathway (AOP) represents the potential causative adverse outcomes (AOs) by inhibition of retinaldehyde dehydrogenase (RALDH), which is one of the crucial enzymes participating in retinol metabolism. The role of RALDH in retinol metabolism is to catalyze the chemical reaction converting retinal to retinoic acid (RA). The synthesized RA is associated with the cellular RA-binding protein (CRABP) and enters into the nucleus, and then bind to retinoic acid receptors (RARs) along with retinoid X receptors (RXRs) (Vilhais-Neto and Pourquié, 2008). The activated RARs and RXRs can act as target gene transcription factors regulating embryonic development in fishes (Perz-Edwards et al., 2011). Inhibition of RALDH can be caused by chemical inhibitors such as Disulphiram, Citral, Paclobutrazol, Diethylaminobenzaldehyde, Nitrofen, 4-biphenyl carboxylic acid, Bisdiamine, SB-210661 and etc. (Marsh-Armstrong et al., 1994; Chawla et al., 2018; Wang et al., 2017; Le et al., 2012; Mey et al., 2003). RALDH inhibition, the molecular initiating event (MIE) for this AOP, leads to decreased RA synthesis blocking the reaction converting retinal to RA in embryonic cells (Hyatt and Dowling, 1997; Molotkov et al., 2002; Le et al., 2012; Duester, 2009). Since RA is an essential activator for the RARs and RXRs-mediated gene transcription, low level of plasma RA leads to abnormal development in embryonic cells. A number of previous studies well-elucidated the abnormal developments by RA inhibition including visual function and eye development (Duester et al., 2009; Hyatt and Dowling, 1997; Hyatt et al., 1996; Kam et al., 2012; Le et al., 2012; Luo et al., 2006; Marsh-Armstrong et al., 1994; Matt et al., 2005; Wang et al., 2017), intestinal development (Nadauld et al., 2005), brain patterning and neurogenesis (Begemann et al., 2004; Niederreither and Dollé, 2008; Samarut et al., 2015), and heart development (Niederreither and Dollé, 2008; Samarut et al., 2015). The development of early embryonic cells of fishes plays an essential role in the organism’s young of year survival and adaptation in fluctuated environmental condition. The impact of the development of the optical elements of the eye by RALDH inhibition in fish population trajectory has not been clarified yet, although the importance of the visual function of fishes previously mentioned by previous studies (Fernald, 1984; Sandström, 1999).
Summary of the AOP
Molecular Initiating Events (MIE)
Key Events (KE)
Adverse Outcomes (AO)
|Sequence||Type||Event ID||Title||Short name|
|1||MIE||1637||Retinaldehyde dehydrogenase inhibition||Retinaldehyde dehydrogenase|
|2||KE||1640||Decreased optical elements of the eye||Optical elements of the eye|
|KE||1641||Decreased retinoic acid (RA) synthesis||retinoic acid|
|KE||1642||Decreased plasma RA level||plasma retionic acid|
|KE||1643||Increased visual impairment||Visual impairment|
|AO||360||Decrease, Population trajectory||Decrease, Population trajectory|
Relationships Between Two Key Events (Including MIEs and AOs)
|Retinaldehyde dehydrogenase leads to retinoic acid||adjacent||High|
|retinoic acid leads to plasma retionic acid||adjacent||High|
|plasma retionic acid leads to Optical elements of the eye||adjacent||High|
|Optical elements of the eye leads to Visual impairment||adjacent||Moderate||Moderate|
|Visual impairment leads to Decrease, Population trajectory||adjacent||Low||Low|
Life Stage Applicability
|Birth to < 1 month||Moderate|
Overall Assessment of the AOP
This AOP is under development supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) (No. CAP-17-01-KIST Europe) and P11911.
Building the AOP frame
Development of KEs
Production of experimental data
Overall assessment of the AOP
Biological domain of applicability
Essentiality of all KEs
Evidence supporting all KERs
Quantitative WoE considerations
Quantitative understanding for each KER
Domain of Applicability
Essentiality of the Key Events
Considerations for Potential Applications of the AOP (optional)
The roles of RALDH play in sensory perception of fish mating opportunities via their presence in the visual functions. Significantly, the AO (population decline) can apply to IATA by dysfunction of the retinoid in reproduction in the aquatic environment. It can be applied to retinoid effects on a central nervous system within the OECD EDTA
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