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Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

Prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the five closest read across substances, gene mutation was predicted for 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3 ). The study assumed the use of Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 with and without S9 metabolic activation system. 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride was predicted to not induce gene mutation in Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 in the presence and presence of S9 metabolic activation system and hence, according to the prediction made, it is not likely to classify as a gene mutant in vitro. Based on the predicted result it can be concluded that the substance is considered to not toxic as per the criteria mentioned in CLP regulation.

Link to relevant study records
Reference
Endpoint:
in vitro gene mutation study in bacteria
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Justification for type of information:
Data is from OECD QSAR Toolbox version 3.3 and the supporting QMRF report has been attached.
Reference:
Composition 0
Qualifier:
according to
Guideline:
other: As mention below
Principles of method if other than guideline:
Prediction is done using OECD QSAR Toolbox version 3.3, 2017
GLP compliance:
not specified
Type of assay:
bacterial reverse mutation assay
Test material information:
Composition 1
Specific details on test material used for the study:
Name - 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride
Mol. formula: C24H30Cl2N2
Molecular Weight - 417.421 g/mole
InChI -1S/C24H30ClN2.ClH/c1-6-27(16-15-25)20-13-11-19(18(2)17-20)12-14-23-24(3,4)21-9-7-8-10-22(21)26(23)5;/h7-14,17H,6,15-16H2,1-5H3;1H/q+1;/p-1
SMILES:CCN(CCCl)c1ccc(C=CC2C(C)(C)c3ccccc3N{+}=2(C).Cl{-})c(C)c1
Target gene:
Histidine
Species / strain:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102
Details on mammalian cell lines (if applicable):
Not applicable
Additional strain characteristics:
not specified
Cytokinesis block (if used):
not specified
Metabolic activation:
with
Metabolic activation system:
S9 metabolic activation
Test concentrations with justification for top dose:
not specified
Vehicle:
not specified
Negative controls:
not specified
Solvent controls:
not specified
True negative controls:
not specified
Positive controls:
not specified
Details on test system and conditions:
not specified
Rationale for test conditions:
not specified
Evaluation criteria:
Prediction was done considering a dose dependent increase in the number of revertants/plate.
Statistics:
not specified
Species / strain:
other: TA 1535, TA 1537, TA 98, TA 100 and TA 102
Metabolic activation:
with
Genotoxicity:
negative
Cytotoxicity:
not specified
Vehicle controls valid:
not specified
Negative controls valid:
not specified
Positive controls valid:
not specified
Remarks on result:
other: No mutagenic effect were observed.
Additional information on results:
not specified

The prediction was based on dataset comprised from the following descriptors: "Gene mutation"
Estimation method: Takes highest mode value from the 5 nearest neighbours
Domain  logical expression:Result: In Domain

(((((((("a" or "b" or "c" )  and "d" )  and ("e" and ( not "f") )  )  and ("g" and ( not "h") )  )  and "i" )  and ("j" and ( not "k") )  )  and "l" )  and ("m" and "n" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as SN2 OR SN2 >> Alkylation, direct acting epoxides and related after cyclization OR SN2 >> Alkylation, direct acting epoxides and related after cyclization >> Nitrogen Mustards by DNA binding by OASIS v.1.3 ONLY

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion formation AND SN1 >> Nitrenium Ion formation >> Tertiary aromatic amine AND SN2 AND SN2 >> Episulfonium Ion Formation AND SN2 >> Episulfonium Ion Formation >> Mustards by DNA binding by OECD

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as SN2 AND SN2 >> Nucleophilic substitution at sp3 carbon atom AND SN2 >> Nucleophilic substitution at sp3 carbon atom >> Alkyl halides  by Protein binding by OASIS v1.3

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as SN2 AND SN2 >> Alkylation, direct acting epoxides and related after cyclization AND SN2 >> Alkylation, direct acting epoxides and related after cyclization >> Nitrogen Mustards by DNA binding by OASIS v.1.3 ONLY

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion formation AND SN1 >> Nitrenium Ion formation >> Tertiary aromatic amine AND SN2 AND SN2 >> Episulfonium Ion Formation AND SN2 >> Episulfonium Ion Formation >> Mustards by DNA binding by OECD

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as Michael addition OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals >> Arenes OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals >> Polycyclic (PAHs) and heterocyclic (HACs) aromatic hydrocarbons-Michael addition OR SN1 >> Iminium Ion Formation OR SN1 >> Iminium Ion Formation >> Aliphatic tertiary amines OR SN1 >> Nitrenium Ion formation >> Secondary aromatic amine by DNA binding by OECD

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as Non binder, without OH or NH2 group by Estrogen Receptor Binding

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Non binder, impaired OH or NH2 group OR Non binder, MW>500 OR Non binder, non cyclic structure by Estrogen Receptor Binding

Domain logical expression index: "i"

Referential boundary: The target chemical should be classified as Bioavailable by Lipinski Rule Oasis ONLY

Domain logical expression index: "j"

Referential boundary: The target chemical should be classified as (!Undefined)Group All Lipid Solubility < 0.01 g/kg AND (!Undefined)Group CNHal Lipid Solubility < 4 g/kg AND (!Undefined)Group CNHal Lipid Solubility < 400 g/kg AND Group All Melting Point > 200 C AND Group CNHal Aqueous Solubility < 0.1 g/L AND Group CNHal Molecular Weight > 370 g/mol AND Group CNHal Molecular Weight > 380 g/mol by Skin irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "k"

Referential boundary: The target chemical should be classified as Group CNHal log Kow > 3.8 by Skin irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "l"

Similarity boundary:Target: CCN(CCCl)c1ccc(C=CC2C(C)(C)c3ccccc3N{+}=2(C).Cl{-})c(C)c1
Threshold=10%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization

Domain logical expression index: "m"

Parametric boundary:The target chemical should have a value of log Kow which is >= 0.967

Domain logical expression index: "n"

Parametric boundary:The target chemical should have a value of log Kow which is <= 3.82

Conclusions:
2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3 )was predicted to not induce gene mutation in Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 in the presence of S9 metabolic activation system and hence, according to the prediction made, it is not likely to classify as a gene mutant in vitro.
Executive summary:

Based on the prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the five closest read across substances, gene mutation was predicted for 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3 ). The study assumed the use of Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 with S9 metabolic activation system. 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride was predicted to not induce gene mutation in Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 in the presence of S9 metabolic activation system and hence, according to the prediction made, it is not likely to classify as a gene mutant in vitro. Based on the predicted result it can be concluded that the substance is considered to not toxic as per the criteria mentioned in CLP regulation.

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (negative)

Genetic toxicity in vivo

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Genetoxicity in vitro:

Prediction model based estimation and data from read across chemical have been reviewed to determine the mutagenic nature of 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3). The studies are as mentioned below

Based on the prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the five closest read across substances, gene mutation was predicted for 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3 ). The study assumed the use of Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 with and without S9 metabolic activation system. 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride was predicted to not induce gene mutation in Salmonella typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and TA 102 in the presence and presence of S9 metabolic activation system and hence, according to the prediction made, it is not likely to classify as a gene mutant in vitro. Based on the predicted result it can be concluded that the substance is considered to not toxic as per the criteria mentioned in CLP regulation.

In a study for structurally and functionally similar read across chemical, Gene mutation toxicity study was performed by National Institute of Technology and Evaluation (J-check, 2017) to determine the mutagenic nature of Chlorocyclohexane (542-18-7). The read across substances share high similarity in structure and log kow .Therefore, it is acceptable to derive information on mutation from the analogue substance. Bacterial reverse mutation test was performed to determine the mutagenic nature of Chlorocyclohexane. The study was performed as per the preincubation protocol using S. typhimurium TA 1535, TA 1537, TA 98, TA100 and E. coli WP2 in the presence and absence of S9 metabolic activation system. The test chemical was dissolved in DMSO and used at dose levels of 2.44, 4.88, 9.77, 19.5, 39.1, 78.1, 156 μg/plate (TA100, TA1535 strains), 9.77, 19.5, 39.1, 78.1, 156, 313 μg/plate (TA98, TA1537, WP2uvrA/pKM101 strains) without S9 and 9.77, 19.5, 39.1, 78.1, 156, 313 μg/plate (TA100, TA1535, TA98, TA1537 strains), 9.77, 19.5, 39.1, 78.1, 156, 313, 625 μg/plate (WP2uvrA/pKM101 strain) with S9. The plates were preincubated for 20 mins at 37°C and the exposure duration was 48 hrs. The plates were observed for dose-related and reproducible doubling of the mean number of revertant colonies per plate than that of the negative control. Chlorocyclohexane did not induce gene mutation in S. typhimurium TA 1535, TA 1537, TA 98, TA100 and E. coli WP2 in the presence and absence of S9 metabolic activation system and hence it is not likely to classify as a gene mutant in vitro.

 

In a study for structurally and functionally similar read across chemical, Gene mutation toxicity study was performed by Rogelio Tornero-Velez et.al. (Drug Metabolism and Disposition,2Drug Metabolism and Disposition004) to determine the mutagenic nature of1, 3 Dichloropropane (142-28-9). The read across substances share high similarity in structure and log kow .Therefore, it is acceptable to derive information on mutation from the analogue substance. Gene mutation toxicity study was performed to determine the mutagenic nature of 1,3- dichloropropane. The study was performed using Salmonella typhimurium strainsTA98, TA100, TA104 TA1535, RSJ100, GSST1 in the presence and absence of S9 metabolic activation system. The chemical was dissolved in DMSO as solvent and used at dose levels 0.00, 0.01, 0.05, 0.10, 0.50, 1.00, 2.00 mg/plate. Concurrent solvent and positive controls were included in the study. 1, 3 Dichloropropane did not induce mutation in Salmonella typhimurium TA98, TA100, TA104 TA1535, RSJ100, GSST1 in the presence and absence of S9 metabolic activation system and hence is not likely to classify as a gene mutant in vitro.

 

Based on the data available for the target chemical and its read across substance and applying weight of evidence 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3)does not exhibit gene mutation in vitro. Hence the test chemical is not likely to classify as a gene mutant in vitro.

Justification for classification or non-classification

Thus based on the above annotation and CLP criteria for the target chemical . 2-[2-[4-[(2-chloroethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride (6441-82-3)does not exhibit gene mutation in vitro. Hence the test chemical is not likely to classify as a gene mutant in vitro.