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Toxicological information

Genetic toxicity: in vitro

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Administrative data

Endpoint:
in vitro gene mutation study in bacteria
Remarks:
Type of genotoxicity: gene mutation
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28-Mar-2016 to 28-Apr-2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study has been performed according to OECD and/or EC guidelines and according to GLP principles.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report Date:
2016

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of assay:
bacterial reverse mutation assay

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid
Details on test material:
- Name of test material (as cited in study report): Diamine methylated
- Substance type:Amber liquid
- Physical state:Liquid
- Storage conditions of test material:At room temperature
- Content (certified): 100% (UVCB–Substance)
- Batch/Lot number:211401A Morris
- Expiration date of the lot/batch:24 March 2018

Method

Target gene:
- S. typhimurium: Histidine gene
- E. coli: Tryptophan gene
Species / strainopen allclose all
Species / strain / cell type:
S. typhimurium TA 1535, TA 1537, TA 98 and TA 100
Species / strain / cell type:
E. coli WP2 uvr A
Metabolic activation:
with and without
Metabolic activation system:
Rat liver S9-mix induced by Aroclor 1254
Test concentrations with justification for top dose:
Experiment 1
Preliminary test (without and with S9) TA100 and WP2uvrA: 1.7, 5.4, 17, 52, 164, 512, 1600 and 5000 µg/plate
Main study: TA1535, TA1537 and TA98:
Without S9-mix: 0.18, 0.52, 1.7, 5.4, 17 and 52 μg/plate.
With S9-mix: 0.52, 1.7, 5.4, 17, 52 and 164 μg/plate.

Experiment 2:
Without S9-mix: 2.6, 4.7, 8.4, 15, 27 and 48 μg/plate.
With S9-mix: 8.4, 15, 27, 48, 86 and 154 μg/plate.

Vehicle / solvent:
- Vehicle(s)/solvent(s) used: ethanol
- Justification for choice of solvent/vehicle:

Test compound was soluble in ethanol and ethanol has been accepted and approved by authorities and international guidelines
Controlsopen allclose all
Untreated negative controls:
no
Negative solvent / vehicle controls:
yes
Positive controls:
yes
Positive control substance:
methylmethanesulfonate
Remarks:
without S9 Migrated to IUCLID6: 650 µg/plate in DMSO for TA100
Positive control substance:
2-nitrofluorene
Remarks:
without S Migrated to IUCLID6: 10 µg/plate in DMSO for TA98 and 15 µg/plate for TA1537
Positive control substance:
4-nitroquinoline-N-oxide
Remarks:
without S9 Migrated to IUCLID6: 10 µg/plate in DMSO for WP2uvrA
Positive control substance:
sodium azide
Remarks:
without S9 Migrated to IUCLID6: 5 µg/plate in saline for TA1535
Positive control substance:
other: 2-aminoanthracene in DMSO for all tester strains
Remarks:
with S9
Details on test system and experimental conditions:
METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Exposure duration: 48 hour

NUMBER OF REPLICATIONS:
- Doses of the test substance were tested in triplicate in each strain. Two independent experiments were conducted.

NUMBER OF CELLS EVALUATED: 10E8 per plate

DETERMINATION OF CYTOTOXICITY
- Method: The reduction of the bacterial background lawn, the increase in the size of the microcolonies and the reduction of the revertant colonies.

OTHER EXAMINATIONS:
- The presence of precipitation of the test compound on the plates was determined.
Evaluation criteria:
A test substance is considered negative (not mutagenic) in the test if:
a) The total number of revertants in tester strain TA100 or WP2uvrA is not greater than two (2) times the concurrent control, and the total number of revertants in tester strains TA1535, TA1537 or TA98 is not greater than three (3) times the concurrent control.
b) The negative response should be reproducible in at least one independently repeated experiment.

A test substance is considered positive if:
a) A two-fold (TA100, WP2uvrA) or more or a three-fold (TA1535, TA1537, TA98) or more increase above solvent control in the mean number of revertant colonies is observed in the test substance group.
b) In case a repeat experiment is performed when a positive response is observed in one of the tester strains, the positive response should be reproducible in at least one independently repeated experiment.

Results and discussion

Test resultsopen allclose all
Key result
Species / strain:
S. typhimurium TA 1535, TA 1537, TA 98 and TA 100
Metabolic activation:
with and without
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
cytotoxicity
Vehicle controls validity:
valid
Untreated negative controls validity:
not examined
Positive controls validity:
valid
Key result
Species / strain:
E. coli WP2 uvr A
Metabolic activation:
with and without
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
cytotoxicity
Vehicle controls validity:
valid
Untreated negative controls validity:
not examined
Positive controls validity:
valid
Additional information on results:
TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation: No precipitation was observed up to and including the top dose of 5000 µg/plate

CYTOTOXICITY RANGE-FINDING/SCREENING STUDIES:
TA1535: without S9: 52 µg/plate and with S9: 164 µg/plate
TA1537: without S9: 52 µg/plate and with S9: 164 µg/plate
TA98: without S9: 52 µg/plate and with S9: 164 µg/plate
TA100: without S9: 52 µg/plate and above and with S9: 164 µg/plate and above
WP2uvrA: without S9: 52 µg/plate and above and with S9: 164 µg/plate and above

COMPARISON WITH HISTORICAL CONTROL DATA:
Acceptable responses were obtained for the negative and strain-specific positive control items indicating that the test conditions were adequate and that the metabolic activation system functioned properly.

ADDITIONAL INFORMATION ON CYTOTOXICITY:
TA1535: without S9: 27 µg/plate and above and with S9: 154 µg/plate
TA1537: without S9: 27 µg/plate and above and with S9: 154 µg/plate
TA98: without S9: 27 µg/plate and above and with S9: 154 µg/plate
TA100: without S9: 27 µg/plate and above and with S9: 154 µg/plate
WP2uvrA: without S9: 45 µg/plate and with S9: 154 µg/plate

Applicant's summary and conclusion

Conclusions:
It is concluded that Diamine methylated is not mutagenic in the Salmonella typhimurium reverse mutation assay and in the Escherichia coli reverse mutation assay
Executive summary:

Diamine methylated did not induce a significant dose-related increase in the number of revertant (His+) colonies in each of the four tester strains (TA1535, TA1537, TA98 and TA100) and in the number of revertant (Trp+) colonies in the tester strain WP2uvrA both in the absence and presence of S9-metabolic activation. These results were confirmed in a follow-up experiment.

The negative control values were within the laboratory historical control data ranges.

 

The strain-specific positive control values were within the laboratory historical control data ranges indicating that the test conditions were adequate and that the metabolic activation system functioned properly, except the response for TA98 in the first experiment (absence of S9-mix).The purpose of the positive control is as a reference for the test system, where a positive response is required to check if the test system functions correctly. Since the value was more than 3 times greater than the concurrent solvent control values, this deviation in the mean plate count of the positive control had no effect on the validity of the study.