← All checklists

MIxS Checklist · ERC000057

Symbiont

Genomic Standards Consortium package extension for reporting of measurements and observations obtained from the environment where the sample was obtained. By choosing the environmental package, a selection of fields can be made from a relevant subsets of the GSC terms.

113 fields2 requiredmixsv1.0.0
SeqDesk offers this GSC MIxS environment checklist when you define studies and samples, so contributors enter exactly the metadata the standard expects. The catalog is kept in sync with the upstream GSC MIxS / ENA checklist definitions (registry v2), last updated 2026-06-03, and is published through our registry API. Source: https://www.ebi.ac.uk/ena/browser/view/ERC000057.

Organism characteristics: ecosystem

trophic levelOptional
trophic_level

Trophic levels are the feeding position in a food chain. Microbes can be a range of producers (e.g. chemolithotroph)

select30 options
observed biotic relationshipOptional
observed_biotic_relationship

Description of relationship(s) between the subject organism and other organism(s) it is associated with. E.g., parasite on species X; mutualist with species Y. The target organism is the subject of the relationship, and the other organism(s) is the object.

select5 options
known pathogenicityOptional
known_pathogenicity

To what is the entity pathogenic, for instance plant, fungi, bacteria

text
relationship to oxygenOptional
relationship_to_oxygen

Is this organism an aerobe, anaerobe? Please note that aerobic and anaerobic are valid descriptors for microbial environments

select7 options
propagationOptional
propagation

The type of reproduction from the parent stock. Values for this field is specific to different taxa. For phage or virus: lytic/lysogenic/temperate/obligately lytic. For plasmids: incompatibility group. For eukaryotes: sexual/asexual. Mandatory for MIGs of eukayotes, plasmids and viruses.

text
host of the symbiont roleOptional
host_of_the_symbiont_role

Role of the host in the life cycle of the symbiotic organism.

text
sample symbiont ofOptional
sample_symbiont_of

Reference to host sample from symbiont. The referenced sample should already be registered in INSDC. E.g. ERSxxxxxx

text

sample collection: methods, storage and transport

sample collection methodOptional
sample_collection_method

The method employed for collecting the sample. Can be provided in the form of a PMID, DOI, url or text.

text
sample storage temperatureOptional
sample_storage_temperature

temperature at which sample was stored, e.g. -80

text
sample storage locationOptional
sample_storage_location

Location at which sample was stored, usually name of a specific freezer/room. Indicate the location name.

text
sample storage solutionOptional
sample_storage_solution

Solution within which sample was stored, if any.

text

sample collection: core sample properties

oxygenation status of sampleOptional
oxygenation_status_of_sample

oxygenation status of sample

select2 options

non-sample terms: study or project

project nameOptional
project_name

Name of the project within which the sequencing was organized

text

non-sample terms

ploidyOptional
ploidy

The ploidy level of the genome (e.g. allopolyploid, haploid, diploid, triploid, tetraploid). It has implications for the downstream study of duplicated gene and regions of the genomes (and perhaps for difficulties in assembly). For terms, please select terms listed under class ploidy (PATO:001374) of Phenotypic Quality Ontology (PATO), and for a browser of PATO (v 2018-03-27) please refer to http://purl.bioontology.org/ontology/PATO

text
number of repliconsOptional
number_of_replicons

Reports the number of replicons in a nuclear genome of eukaryotes, in the genome of a bacterium or archaea or the number of segments in a segmented virus. Always applied to the haploid chromosome count of a eukaryote. Mandatory for MIGS of eukaryotes, bacteria, archaea and segmented virus.

text
extrachromosomal elementsOptional
extrachromosomal_elements

Do plasmids exist of significant phenotypic consequence (e.g. ones that determine virulence or antibiotic resistance). Megaplasmids? Other plasmids (borrelia has 15+ plasmids).

text
estimated sizeOptional
estimated_size

The estimated size of the genome (in bp) prior to sequencing. Of particular importance in the sequencing of (eukaryotic) genome which could remain in draft form for a long or unspecified period. Mandatory for MIGS of eukaryotes.

text
target geneOptional
target_gene

Targeted gene or locus name for marker gene studies

text
target subfragmentOptional
target_subfragment

Name of subfragment of a gene or locus. Important to e.g. identify special regions on marker genes like V6 on 16S rRNA

text
multiplex identifiersOptional
multiplex_identifiers

Molecular barcodes, called Multiplex Identifiers (MIDs), that are used to specifically tag unique samples in a sequencing run. Sequence should be reported in uppercase letters

text
sequence quality checkOptional
sequence_quality_check

Indicate if the sequence has been called by automatic systems (none) or undergone a manual editing procedure (e.g. by inspecting the raw data or chromatograms). Applied only for sequences that are not submitted to SRA or DRA

select3 options
chimera check softwareOptional
chimera_check_software

Tool(s) used for chimera checking, including version number and parameters, to discover and remove chimeric sequences. A chimeric sequence is comprised of two or more phylogenetically distinct parent sequences.

text
relevant electronic resourcesOptional
relevant_electronic_resources

A related resource that is referenced, cited, or otherwise associated to the sequence in the format of a PMID, DOI or URL

text
relevant standard operating proceduresOptional
relevant_standard_operating_procedures

Standard operating procedures used in assembly and/or annotation of genomes, metagenomes or environmental sequences in the format of a PMID, DOI or URL

text
16s recoveredOptional
16s_recovered

Can a 16S gene be recovered from the submitted bin, SAG or MAG?

select2 options
16S recovery softwareOptional
16s_recovery_software

Tools used for 16S rRNA gene extraction. Add names and versions of software(s), parameters used

text

Collection event information

collection dateRequired
collection_date

The date the sample was collected with the intention of sequencing, either as an instance (single point in time) or interval. In case no exact time is available, the date/time can be right truncated i.e. all of these are valid ISO8601 compliant times: 2008-01-23T19:23:10+00:00; 2008-01-23T19:23:10; 2008-01-23; 2008-01; 2008.

text
altitudeOptional
altitude

The altitude of the sample is the vertical distance between Earth's surface above Sea Level and the sampled position in the air.

text
geographic location (latitude)Optional
geographic_location_latitude

The geographical origin of the sample as defined by latitude. The values should be reported in decimal degrees and in WGS84 system

text
geographic location (longitude)Optional
geographic_location_longitude

The geographical origin of the sample as defined by longitude. The values should be reported in decimal degrees and in WGS84 system

text
geographic location (region and locality)Optional
geographic_location_region_and_locality

The geographical origin of the sample as defined by the specific region name followed by the locality name.

text
broad-scale environmental contextOptional
broadscale_environmental_context

Report the major environmental system the sample or specimen came from. The system(s) identified should have a coarse spatial grain, to provide the general environmental context of where the sampling was done (e.g. in the desert or a rainforest). We recommend using subclasses of EnvO’s biome class: http://purl.obolibrary.org/obo/ENVO_00000428. EnvO documentation about how to use the field: https://github.com/EnvironmentOntology/envo/wiki/Using-ENVO-with-MIxS.

text
local environmental contextOptional
local_environmental_context

Report the entity or entities which are in the sample or specimen’s local vicinity and which you believe have significant causal influences on your sample or specimen. We recommend using EnvO terms which are of smaller spatial grain than your entry for "broad-scale environmental context". Terms, such as anatomical sites, from other OBO Library ontologies which interoperate with EnvO (e.g. UBERON) are accepted in this field. EnvO documentation about how to use the field: https://github.com/EnvironmentOntology/envo/wiki/Using-ENVO-with-MIxS.

text
environmental mediumOptional
environmental_medium

Report the environmental material(s) immediately surrounding the sample or specimen at the time of sampling. We recommend using subclasses of 'environmental material' (http://purl.obolibrary.org/obo/ENVO_00010483). EnvO documentation about how to use the field: https://github.com/EnvironmentOntology/envo/wiki/Using-ENVO-with-MIxS . Terms from other OBO ontologies are permissible as long as they reference mass/volume nouns (e.g. air, water, blood) and not discrete, countable entities (e.g. a tree, a leaf, a table top).

text
elevationOptional
elevation

The elevation of the sampling site as measured by the vertical distance from mean sea level.

text

sample collection

amount or size of sample collectedOptional
amount_or_size_of_sample_collected

The total amount or size (volume (ml), mass (g) or area (m2) ) of sample collected.

text
organism countOptional
organism_count

Total cell count of any organism (or group of organisms) per gram, volume or area of sample, should include name of organism followed by count. The method that was used for the enumeration (e.g. qPCR, atp, mpn, etc.) Should also be provided. (example: total prokaryotes; 3.5e7 cells per ml; qpcr)

text

Organism characteristics

sample storage durationOptional
sample_storage_duration

Duration for which the sample was stored. Indicate the duration for which the sample was stored written in ISO 8601 format.

text
geographic location (country and/or sea)Required
geographic_location_country_andor_sea

The geographical origin of where the sample was collected from, with the intention of sequencing, as defined by the country or sea name. Country or sea names should be chosen from the INSDC country list (http://insdc.org/country.html).

select294 options

host disorder

host disease statusOptional
host_disease_status

list of diseases with which the host has been diagnosed; can include multiple diagnoses. The value of the field depends on host; for humans the terms should be chosen from DO (Disease Ontology) at http://www.disease-ontology.org, other hosts are free text

text
host of the symbiotic host disease statusOptional
host_of_the_symbiotic_host_disease_status

List of diseases with which the host of the symbiotic host organism has been diagnosed; can include multiple diagnoses. The value of the field depends on host; for humans the terms should be chosen from the DO (Human Disease Ontology) at https://www.disease-ontology.org, non-human host diseases are free text.

text

host description

host common nameOptional
host_common_name

common name of the host, e.g. human

text
host subject idOptional
host_subject_id

a unique identifier by which each subject can be referred to, de-identified, e.g. #131

text
host ageOptional
host_age

age of host at the time of sampling; relevant scale depends on species and study, e.g. could be seconds for amoebae or centuries for trees

text
host taxidOptional
host_taxid

NCBI taxon id of the host, e.g. 9606

text
host body habitatOptional
host_body_habitat

original body habitat where the sample was obtained from

text
host body siteOptional
host_body_site

name of body site where the sample was obtained from, such as a specific organ or tissue (tongue, lung etc...). For Foundational Model of Anatomy Ontology (FMA) (v 3.1) terms, please see http://purl.bioontology.org/ontology/FMA

text
host life stageOptional
host_life_stage

description of life stage of host

text
host heightOptional
host_height

the height of subject

text
host lengthOptional
host_length

the length of subject

text
host growth conditionsOptional
host_growth_conditions

literature reference giving growth conditions of the host

text
host substrateOptional
host_substrate

the growth substrate of the host

text
host total massOptional
host_total_mass

total mass of the host at collection, the unit depends on host

text
host infra-specific nameOptional
host_infraspecific_name

taxonomic information about the host below subspecies level

text
host infra-specific rankOptional
host_infraspecific_rank

taxonomic rank information about the host below subspecies level, such as variety, form, rank etc.

text
host phenotypeOptional
host_phenotype

phenotype of host. For Phenotypic quality Ontology (PATO) (v 2013-10-28) terms, please see http://purl.bioontology.org/ontology/PATO

text
host colorOptional
host_color

the color of host

text
host shapeOptional
host_shape

morphological shape of host

text
host sexOptional
host_sex

Gender or sex of the host.

select17 options
host scientific nameOptional
host_scientific_name

Scientific name of the natural (as opposed to laboratory) host to the organism from which sample was obtained.

text
host of the symbiotic host subject idOptional
host_of_the_symbiotic_host_subject_id

A unique identifier by which each host of the symbiotic host organism subject can be referred to, de-identified, e.g. #H14.

text

Host association

host of the symbiotic host taxon idOptional
host_of_the_symbiotic_host_taxon_id

NCBI taxon id of the host of the symbiotic host organism.

text
duration of association with the hostOptional
duration_of_association_with_the_host

Time spent in host of the symbiotic organism at the time of sampling; relevant scale depends on symbiotic organism and study.

text

local environment conditions

temperatureOptional
temperature

temperature of the sample at time of sampling

text

concentration measurement

sample salinityOptional
sample_salinity

Salinity is the total concentration of all dissolved salts in a liquid or solid (in the form of an extract obtained by centrifugation) sample. While salinity can be measured by a complete chemical analysis, this method is difficult and time consuming. More often, it is instead derived from the conductivity measurement. This is known as practical salinity. These derivations compare the specific conductance of the sample to a salinity standard such as seawater

text

Pointer to physical material

source material identifiersOptional
source_material_identifiers

A unique identifier assigned to a material sample (as defined by http://rs.tdwg.org/dwc/terms/materialSampleID, and as opposed to a particular digital record of a material sample) used for extracting nucleic acids, and subsequent sequencing. The identifier can refer either to the original material collected or to any derived sub-samples. The INSDC qualifiers /specimen_voucher, /bio_material, or /culture_collection may or may not share the same value as the source_mat_id field. For instance, the /specimen_voucher qualifier and source_mat_id may both contain 'UAM:Herps:14' , referring to both the specimen voucher and sampled tissue with the same identifier. However, the /culture_collection qualifier may refer to a value from an initial culture (e.g. ATCC:11775) while source_mat_id would refer to an identifier from some derived culture from which the nucleic acids were extracted (e.g. xatc123 or ark:/2154/R2).

text

host details

host family relationshipOptional
host_family_relationship

Familial relationships to other hosts in the same study; can include multiple relationships

text
host genotypeOptional
host_genotype

observed genotype

text
gravidityOptional
gravidity

Whether or not the subject is gravid. If so, report date due or date post-conception and specify which of these two dates is being reported.

text
host specificity or rangeOptional
host_specificity_or_range

The range and diversity of host species that an organism is capable of infecting, defined by NCBI taxonomy identifier.

text
host of the symbiotic host phenotypeOptional
host_of_the_symbiotic_host_phenotype

Phenotype of the host of the symbiotic host organism. For phenotypic quality ontology (PATO) terms, see http://purl.bioontology.org/ontology/pato.

text
mode of transmissionOptional
mode_of_transmission

The process through which the symbiotic host organism entered the host from which it was sampled.

text
symbiotic host organism life cycle typeOptional
symbiotic_host_organism_life_cycle_type

Type of life cycle of the symbiotic host species (the thing being sampled). Simple life cycles occur within a single host, complex ones within multiple different hosts over the course of their normal life cycle.

text
host dependenceOptional
host_dependence

Type of host dependence for the symbiotic host organism to its host.

text
host specificityOptional
host_specificity

Level of specificity of symbiont-host interaction: e.g. generalist (symbiont able to establish associations with distantly related hosts) or species-specific.

text
host cellular locationOptional
host_cellular_location

The localization of the symbiotic host organism within the host from which it was sampled: e.g. intracellular if the symbiotic host organism is localized within the cells or extracellular if the symbiotic host organism is localized outside of cells.

text
host of the symbiotic host infra-specific rankOptional
host_of_the_symbiotic_host_infraspecific_rank

Taxonomic rank information about the host of the symbiotic host organism below subspecies level, such as variety, form, rank etc.

text
type of symbiosisOptional
type_of_symbiosis

Type of biological interaction established between the symbiotic host organism being sampled and its respective host

text
observed coinfecting organisms in host of hostOptional
observed_coinfecting_organisms_in_host_of_host

The taxonomic name of any coinfecting organism observed in a symbiotic relationship with the host of the sampled host organism. e.g. where a sample collected from a host trematode species (A) which was collected from a host_of_host fish (B) that was also infected with a nematode (C), the value here would be (C) the nematode {species name} or {common name}. Multiple co-infecting species may be added in a comma-separated list. For listing symbiotic organisms associated with the host (A) use the term Observed host symbiont.

text
host of the symbiotic host infra-specific nameOptional
host_of_the_symbiotic_host_infraspecific_name

Taxonomic name information of the host of the symbiotic host organism below subspecies level.

text
host of the symbiotic host total massOptional
host_of_the_symbiotic_host_total_mass

Total mass of the host of the symbiotic host organism at collection, the unit depends on the host.

text
host of the symbiotic host local environmental contextOptional
host_of_the_symbiotic_host_local_environmental_context

For a symbiotic host organism the local anatomical environment within its host may have causal influences. Report the anatomical entity(s) which are in the direct environment of the symbiotic host organism being sampled and which you believe have significant causal influences on your sample or specimen. For example, if the symbiotic host organism being sampled is an intestinal worm, its local environmental context will be the term for intestine from UBERON (http://uberon.github.io/).

text
host of the symbiotic host common nameOptional
host_of_the_symbiotic_host_common_name

Common name of the host of the symbiotic host organism.

text
host of the symbiotic host genotypeOptional
host_of_the_symbiotic_host_genotype

Observed genotype of the host of the symbiotic host organism.

text
route of transmissionOptional
route_of_transmission

Description of path taken by the symbiotic host organism being sampled in order to establish a symbiotic relationship with the host (with which it was observed at the time of sampling) via a mode of transmission (specified in mode_transmission).

text
host dry massOptional
host_dry_mass

measurement of dry mass

text
host body productOptional
host_body_product

substance produced by the body, e.g. stool, mucus, where the sample was obtained from. For Foundational Model of Anatomy Ontology (FMA) (v 3.1) terms, please see http://purl.bioontology.org/ontology/FMA

text
host number individualOptional
host_number_individual

Number of symbiotic host individuals pooled at the time of collection.

text

treatment

perturbationOptional
perturbation

type of perturbation, e.g. chemical administration, physical disturbance, etc., coupled with time that perturbation occurred; can include multiple perturbation types

text

experimental factor and block

negative control typeOptional
negative_control_type

The substance or equipment used as a negative control in an investigation

text
positive control typeOptional
positive_control_type

The substance, mixture, product, or apparatus used to verify that a process which is part of an investigation delivers a true positive.

text
experimental factorOptional
experimental_factor

Experimental factors are essentially the variable aspects of an experiment design which can be used to describe an experiment, or set of experiments, in an increasingly detailed manner. This field accepts ontology terms from Experimental Factor Ontology (EFO) and/or Ontology for Biomedical Investigations (OBI). For a browser of EFO (v 2.95) terms, please see http://purl.bioontology.org/ontology/EFO; for a browser of OBI (v 2018-02-12) terms please see http://purl.bioontology.org/ontology/OBI. E.g. time series design [EFO:EFO_0001779]

text

Organism characteristics: genetic

encoded traitsOptional
encoded_traits

Should include key traits like antibiotic resistance or xenobiotic degradation phenotypes for plasmids, converting genes for phage

text
subspecific genetic lineageOptional
subspecific_genetic_lineage

Information about the genetic distinctness of the sequenced organism below the subspecies level, e.g., serovar, serotype, biotype, ecotype, or any relevant genetic typing schemes like Group I plasmid. Subspecies should not be recorded in this term, but in the NCBI taxonomy. Supply both the lineage name and the lineage rank separated by a colon, e.g., biovar:abc123.

text
taxonomic classificationOptional
taxonomic_classification

Method used for taxonomic classification, along with reference database used, classification rank, and thresholds used to classify new genomes. Expected values are: classification method, database name, and other parameters e.g. vConTACT vContact2 (references from NCBI RefSeq v83, genus rank classification, default parameters)

text

Reference

isolation and growth conditionOptional
isolation_and_growth_condition

Publication reference in the form of pubmed ID (pmid), digital object identifier (doi) or url for isolation and growth condition specifications of the organism/material. Mandatory for MIGS and MIMARKS Specimen.

text
annotation sourceOptional
annotation_source

For cases where annotation was provided by a community jamboree or model organism database rather than by a specific submitter

text
reference for biomaterialOptional
reference_for_biomaterial

Primary publication if isolated before genome publication; otherwise, primary genome report. Mandatory for MIGS of bacteria and archaea.

text

sample processing

single cell or viral particle lysis approachOptional
single_cell_or_viral_particle_lysis_approach

Method used to free DNA from interior of the cell(s) or particle(s)

select4 options
single cell or viral particle lysis kit protocolOptional
single_cell_or_viral_particle_lysis_kit_protocol

Name of the kit or standard protocol used for cell(s) or particle(s) lysis

text
sample material processingOptional
sample_material_processing

A brief description of any processing applied to the sample during or after retrieving the sample from environment, or a link to the relevant protocol(s) performed.

text
sample volume or weight for DNA extractionOptional
sample_volume_or_weight_for_dna_extraction

Volume (ml) or mass (g) of total collected sample processed for DNA extraction. Note: total sample collected should be entered under the term 'sample size'.

text
nucleic acid extractionOptional
nucleic_acid_extraction

A link to a literature reference, electronic resource or a standard operating procedure (SOP), that describes the material separation to recover the nucleic acid fraction from a sample

text
nucleic acid amplificationOptional
nucleic_acid_amplification

A link to a literature reference, electronic resource or a standard operating procedure (SOP), that describes the enzymatic amplification (PCR, TMA, NASBA) of specific nucleic acids

text
library sizeOptional
library_size

Total number of clones in the library prepared for the project

text
library reads sequencedOptional
library_reads_sequenced

Total number of clones sequenced from the library

text
library vectorOptional
library_vector

Cloning vector type(s) used in construction of libraries

text
library screening strategyOptional
library_screening_strategy

Specific enrichment or screening methods applied before and/or after creating clone libraries in order to select a specific group of sequences

text
pcr conditionsOptional
pcr_conditions

Description of reaction conditions and components for PCR in the form of 'initial denaturation:94degC_1.5min; annealing=...'

text
pcr primersOptional
pcr_primers

PCR primers that were used to amplify the sequence of the targeted gene, locus or subfragment. This field should contain all the primers used for a single PCR reaction if multiple forward or reverse primers are present in a single PCR reaction. The primer sequence should be reported in uppercase letters

text
adaptersOptional
adapters

Adapters provide priming sequences for both amplification and sequencing of the sample-library fragments. Both adapters should be reported; in uppercase letters

text

Environmental information

depthOptional
depth

The vertical distance below local surface, e.g. for sediment or soil samples depth is measured from sediment or soil surface, respectively. Depth can be reported as an interval for subsurface samples.

text

local environment conditions imposed

chemical administrationOptional
chemical_administration

list of chemical compounds administered to the host or site where sampling occurred, and when (e.g. antibiotics, N fertilizer, air filter); can include multiple compounds. For Chemical Entities of Biological Interest ontology (CHEBI) (v111), please see http://purl.bioontology.org/ontology/CHEBI

text