def _exportISATAB(self, destinationPath, detailsDict):
"""
Export the dataset's metadata to the directory *destinationPath* as ISATAB
detailsDict should have the format:
detailsDict = {
'investigation_identifier' : "i1",
'investigation_title' : "Give it a title",
'investigation_description' : "Add a description",
'investigation_submission_date' : "2016-11-03",
'investigation_public_release_date' : "2016-11-03",
'first_name' : "Noureddin",
'last_name' : "Sadawi",
'affiliation' : "University",
'study_filename' : "my_ms_study",
'study_material_type' : "Serum",
'study_identifier' : "s1",
'study_title' : "Give the study a title",
'study_description' : "Add study description",
'study_submission_date' : "2016-11-03",
'study_public_release_date' : "2016-11-03",
'assay_filename' : "my_ms_assay"
}
:param str destinationPath: Path to a directory in which the output will be saved
:param dict detailsDict: Contains several key, value pairs required to for ISATAB
:raises IOError: If writing one of the files fails
"""
from isatools.model import Investigation, Study, Assay, OntologyAnnotation, OntologySource, Person, Publication, Protocol, Source
from isatools.model import Comment, Sample, Characteristic, Process, Material, DataFile, ParameterValue, plink
from isatools import isatab
import isaExplorer as ie
investigation = Investigation()
investigation.identifier = detailsDict['investigation_identifier']
investigation.title = detailsDict['investigation_title']
investigation.description = detailsDict['investigation_description']
investigation.submission_date = detailsDict[
'investigation_submission_date'] #use today if not specified
investigation.public_release_date = detailsDict[
'investigation_public_release_date']
study = Study(filename='s_' + detailsDict['study_filename'] + '.txt')
study.identifier = detailsDict['study_identifier']
study.title = detailsDict['study_title']
study.description = detailsDict['study_description']
study.submission_date = detailsDict['study_submission_date']
study.public_release_date = detailsDict['study_public_release_date']
investigation.studies.append(study)
obi = OntologySource(
name='OBI', description="Ontology for Biomedical Investigations")
investigation.ontology_source_references.append(obi)
intervention_design = OntologyAnnotation(term_source=obi)
intervention_design.term = "intervention design"
intervention_design.term_accession = "http://purl.obolibrary.org/obo/OBI_0000115"
study.design_descriptors.append(intervention_design)
# Other instance variables common to both Investigation and Study objects include 'contacts' and 'publications',
# each with lists of corresponding Person and Publication objects.
contact = Person(first_name=detailsDict['first_name'],
last_name=detailsDict['last_name'],
affiliation=detailsDict['affiliation'],
roles=[OntologyAnnotation(term='submitter')])
study.contacts.append(contact)
publication = Publication(title="Experiments with Data",
author_list="Auther 1, Author 2")
publication.pubmed_id = "12345678"
publication.status = OntologyAnnotation(term="published")
study.publications.append(publication)
# To create the study graph that corresponds to the contents of the study table file (the s_*.txt file), we need
# to create a process sequence. To do this we use the Process class and attach it to the Study object's
# 'process_sequence' list instance variable. Each process must be linked with a Protocol object that is attached to
# a Study object's 'protocols' list instance variable. The sample collection Process object usually has as input
# a Source material and as output a Sample material.
sample_collection_protocol = Protocol(
id_="sample collection",
name="sample collection",
protocol_type=OntologyAnnotation(term="sample collection"))
aliquoting_protocol = Protocol(
id_="aliquoting",
name="aliquoting",
protocol_type=OntologyAnnotation(term="aliquoting"))
for index, row in self.sampleMetadata.iterrows():
src_name = row['Sample File Name']
source = Source(name=src_name)
source.comments.append(
Comment(name='Study Name', value=row['Study']))
study.sources.append(source)
sample_name = src_name
sample = Sample(name=sample_name, derives_from=[source])
# check if field exists first
status = row[
'Status'] if 'Status' in self.sampleMetadata.columns else 'N/A'
characteristic_material_type = Characteristic(
category=OntologyAnnotation(term="material type"),
value=status)
sample.characteristics.append(characteristic_material_type)
#characteristic_material_role = Characteristic(category=OntologyAnnotation(term="material role"), value=row['AssayRole'])
#sample.characteristics.append(characteristic_material_role)
# check if field exists first
age = row['Age'] if 'Age' in self.sampleMetadata.columns else 'N/A'
characteristic_age = Characteristic(
category=OntologyAnnotation(term="Age"),
value=age,
unit='Year')
sample.characteristics.append(characteristic_age)
# check if field exists first
gender = row[
'Gender'] if 'Gender' in self.sampleMetadata.columns else 'N/A'
characteristic_gender = Characteristic(
category=OntologyAnnotation(term="Gender"), value=gender)
sample.characteristics.append(characteristic_gender)
ncbitaxon = OntologySource(name='NCBITaxon',
description="NCBI Taxonomy")
characteristic_organism = Characteristic(
category=OntologyAnnotation(term="Organism"),
value=OntologyAnnotation(
term="H**o Sapiens",
term_source=ncbitaxon,
term_accession=
"http://purl.bioontology.org/ontology/NCBITAXON/9606"))
sample.characteristics.append(characteristic_organism)
study.samples.append(sample)
# check if field exists first
sampling_date = row['Sampling Date'] if not pandas.isnull(
row['Sampling Date']) else None
sample_collection_process = Process(
id_='sam_coll_proc',
executes_protocol=sample_collection_protocol,
date_=sampling_date)
aliquoting_process = Process(id_='sam_coll_proc',
executes_protocol=aliquoting_protocol,
date_=sampling_date)
sample_collection_process.inputs = [source]
aliquoting_process.outputs = [sample]
# links processes
plink(sample_collection_process, aliquoting_process)
study.process_sequence.append(sample_collection_process)
study.process_sequence.append(aliquoting_process)
study.protocols.append(sample_collection_protocol)
study.protocols.append(aliquoting_protocol)
### Add NMR Assay ###
nmr_assay = Assay(
filename='a_' + detailsDict['assay_filename'] + '.txt',
measurement_type=OntologyAnnotation(term="metabolite profiling"),
technology_type=OntologyAnnotation(term="NMR spectroscopy"))
extraction_protocol = Protocol(
name='extraction',
protocol_type=OntologyAnnotation(term="material extraction"))
study.protocols.append(extraction_protocol)
nmr_protocol = Protocol(
name='NMR spectroscopy',
protocol_type=OntologyAnnotation(term="NMR Assay"))
nmr_protocol.add_param('Run Order')
#if 'Instrument' in self.sampleMetadata.columns:
nmr_protocol.add_param('Instrument')
#if 'Sample Batch' in self.sampleMetadata.columns:
nmr_protocol.add_param('Sample Batch')
nmr_protocol.add_param('Acquisition Batch')
study.protocols.append(nmr_protocol)
#for index, row in sampleMetadata.iterrows():
for index, sample in enumerate(study.samples):
row = self.sampleMetadata.loc[
self.sampleMetadata['Sample File Name'].astype(
str) == sample.name]
# create an extraction process that executes the extraction protocol
extraction_process = Process(executes_protocol=extraction_protocol)
# extraction process takes as input a sample, and produces an extract material as output
sample_name = sample.name
sample = Sample(name=sample_name, derives_from=[source])
#print(row['Acquired Time'].values[0])
extraction_process.inputs.append(sample)
material = Material(name="extract-{}".format(index))
material.type = "Extract Name"
extraction_process.outputs.append(material)
# create a ms process that executes the nmr protocol
nmr_process = Process(executes_protocol=nmr_protocol,
date_=datetime.isoformat(
datetime.strptime(
str(row['Acquired Time'].values[0]),
'%Y-%m-%d %H:%M:%S')))
nmr_process.name = "assay-name-{}".format(index)
nmr_process.inputs.append(extraction_process.outputs[0])
# nmr process usually has an output data file
# check if field exists first
assay_data_name = row['Assay data name'].values[
0] if 'Assay data name' in self.sampleMetadata.columns else 'N/A'
datafile = DataFile(filename=assay_data_name,
label="NMR Assay Name",
generated_from=[sample])
nmr_process.outputs.append(datafile)
#nmr_process.parameter_values.append(ParameterValue(category='Run Order',value=str(i)))
nmr_process.parameter_values = [
ParameterValue(category=nmr_protocol.get_param('Run Order'),
value=row['Run Order'].values[0])
]
# check if field exists first
instrument = row['Instrument'].values[
0] if 'Instrument' in self.sampleMetadata.columns else 'N/A'
nmr_process.parameter_values.append(
ParameterValue(category=nmr_protocol.get_param('Instrument'),
value=instrument))
# check if field exists first
sbatch = row['Sample batch'].values[
0] if 'Sample batch' in self.sampleMetadata.columns else 'N/A'
nmr_process.parameter_values.append(
ParameterValue(category=nmr_protocol.get_param('Sample Batch'),
value=sbatch))
nmr_process.parameter_values.append(
ParameterValue(
category=nmr_protocol.get_param('Acquisition Batch'),
value=row['Batch'].values[0]))
# ensure Processes are linked forward and backward
plink(extraction_process, nmr_process)
# make sure the extract, data file, and the processes are attached to the assay
nmr_assay.samples.append(sample)
nmr_assay.data_files.append(datafile)
nmr_assay.other_material.append(material)
nmr_assay.process_sequence.append(extraction_process)
nmr_assay.process_sequence.append(nmr_process)
nmr_assay.measurement_type = OntologyAnnotation(
term="metabolite profiling")
nmr_assay.technology_type = OntologyAnnotation(
term="NMR spectroscopy")
# attach the assay to the study
study.assays.append(nmr_assay)
if os.path.exists(os.path.join(destinationPath,
'i_Investigation.txt')):
ie.appendStudytoISA(study, destinationPath)
else:
isatab.dump(isa_obj=investigation, output_path=destinationPath)
def create_descriptor():
"""
Returns a simple but complete ISA-JSON 1.0 descriptor for illustration.
"""
# Create an empty Investigation object and set some values to the
# instance variables.
investigation = Investigation()
investigation.identifier = "1"
investigation.title = "My Simple ISA Investigation"
investigation.description = \
"We could alternatively use the class constructor's parameters to " \
"set some default values at the time of creation, however we " \
"want to demonstrate how to use the object's instance variables " \
"to set values."
investigation.submission_date = "2016-11-03"
investigation.public_release_date = "2016-11-03"
# Create an empty Study object and set some values. The Study must have a
# filename, otherwise when we serialize it to ISA-Tab we would not know
# where to write it. We must also attach the study to the investigation
# by adding it to the 'investigation' object's list of studies.
study = Study(filename="s_study.txt")
study.identifier = "1"
study.title = "My ISA Study"
study.description = \
"Like with the Investigation, we could use the class constructor " \
"to set some default values, but have chosen to demonstrate in this " \
"example the use of instance variables to set initial values."
study.submission_date = "2016-11-03"
study.public_release_date = "2016-11-03"
investigation.studies.append(study)
# This is to show that ISA Comments can be used to annotate ISA objects, here ISA Study
study.comments.append(Comment(name="Study Start Date", value="Sun"))
# Some instance variables are typed with different objects and lists of
# objects. For example, a Study can have a list of design descriptors.
# A design descriptor is an Ontology Annotation describing the kind of
# study at hand. Ontology Annotations should typically reference an
# Ontology Source. We demonstrate a mix of using the class constructors
# and setting values with instance variables. Note that the
# OntologyAnnotation object 'intervention_design' links its 'term_source'
# directly to the 'obi' object instance. To ensure the OntologySource
# is encapsulated in the descriptor, it is added to a list of
# 'ontology_source_references' in the Investigation object. The
# 'intervention_design' object is then added to the list of
# 'design_descriptors' held by the Study object.
obi = OntologySource(name='OBI',
description="Ontology for Biomedical Investigations")
investigation.ontology_source_references.append(obi)
intervention_design = OntologyAnnotation(term_source=obi)
intervention_design.term = "intervention design"
intervention_design.term_accession = \
"http://purl.obolibrary.org/obo/OBI_0000115"
study.design_descriptors.append(intervention_design)
# Other instance variables common to both Investigation and Study objects
# include 'contacts' and 'publications', each with lists of corresponding
# Person and Publication objects.
contact = Person(first_name="Alice",
last_name="Robertson",
affiliation="University of Life",
roles=[OntologyAnnotation(term='submitter')])
study.contacts.append(contact)
publication = Publication(title="Experiments with Elephants",
author_list="A. Robertson, B. Robertson")
publication.pubmed_id = "12345678"
publication.status = OntologyAnnotation(term="published")
study.publications.append(publication)
# To create the study graph that corresponds to the contents of the study
# table file (the s_*.txt file), we need to create a process sequence.
# To do this we use the Process class and attach it to the Study object's
# 'process_sequence' list instance variable. Each process must be linked
# with a Protocol object that is attached to a Study object's 'protocols'
# list instance variable. The sample collection Process object usually has
# as input a Source material and as output a Sample material.
# Here we create one Source material object and attach it to our study.
source = Source(name='source_material')
study.sources.append(source)
# Then we create three Sample objects, with organism as H**o Sapiens, and
# attach them to the study. We use the utility function
# batch_create_material() to clone a prototype material object. The
# function automatiaclly appends an index to the material name. In this
# case, three samples will be created, with the names 'sample_material-0',
# 'sample_material-1' and 'sample_material-2'.
prototype_sample = Sample(name='sample_material', derives_from=[source])
ncbitaxon = OntologySource(name='NCBITaxon', description="NCBI Taxonomy")
investigation.ontology_source_references.append(ncbitaxon)
characteristic_organism = Characteristic(
category=OntologyAnnotation(term="Organism"),
value=OntologyAnnotation(
term="H**o Sapiens",
term_source=ncbitaxon,
term_accession="http://purl.bioontology.org/ontology/NCBITAXON/"
"9606"))
# Adding the description to the ISA Source Material:
source.characteristics.append(characteristic_organism)
study.sources.append(source)
#declaring a new ontology and adding it to the list of resources used
uberon = OntologySource(name='UBERON', description='Uber Anatomy Ontology')
investigation.ontology_source_references.append(uberon)
#preparing an ISA Characteristic object (~Material Property ) to annotate sample materials
characteristic_organ = Characteristic(
category=OntologyAnnotation(term="OrganismPart"),
value=OntologyAnnotation(
term="liver",
term_source=uberon,
term_accession="http://purl.bioontology.org/ontology/UBERON/"
"123245"))
prototype_sample.characteristics.append(characteristic_organ)
study.samples = batch_create_materials(prototype_sample, n=3)
# creates a batch of 3 samples
# Now we create a single Protocol object that represents our sample
# collection protocol, and attach it to the study object. Protocols must be
# declared before we describe Processes, as a processing event of some sort
# must execute some defined protocol. In the case of the class model,
# Protocols should therefore be declared before Processes in order for the
# Process to be linked to one.
sample_collection_protocol = Protocol(
name="sample collection",
protocol_type=OntologyAnnotation(term="sample collection"))
study.protocols.append(sample_collection_protocol)
sample_collection_process = Process(
executes_protocol=sample_collection_protocol)
# adding a dummy Comment[] to ISA.protocol object
study.protocols[0].comments.append(
Comment(name="Study Start Date", value="Uranus"))
study.protocols[0].comments.append(
Comment(name="Study End Date", value="2017-08-11"))
# checking that the ISA Protocool object has been modified
# print(study.protocols[0])
# Creation of an ISA Study Factor object
f = StudyFactor(
name="treatment['modality']",
factor_type=OntologyAnnotation(term="treatment['modality']"))
# testing serialization to ISA-TAB of Comments attached to ISA objects.
f.comments.append(Comment(name="Study Start Date", value="Saturn"))
f.comments.append(Comment(name="Study End Date", value="2039-12-12"))
print(f.comments[0].name, "|", f.comments[0].value)
# checking that the ISA Factor object has been modified
study.factors.append(f)
# Next, we link our materials to the Process. In this particular case, we
# are describing a sample collection process that takes one source
# material, and produces three different samples.
#
# (source_material)->(sample collection)->
# [(sample_material-0), (sample_material-1), (sample_material-2)]
for src in study.sources:
sample_collection_process.inputs.append(src)
for sam in study.samples:
sample_collection_process.outputs.append(sam)
# Finally, attach the finished Process object to the study
# process_sequence. This can be done many times to describe multiple
# sample collection events.
study.process_sequence.append(sample_collection_process)
#IMPORTANT: remember to populate the list of ontology categories used to annotation ISA Material in a Study:
study.characteristic_categories.append(characteristic_organism.category)
# Next, we build n Assay object and attach two protocols,
# extraction and sequencing.
assay = Assay(filename="a_assay.txt")
extraction_protocol = Protocol(
name='extraction',
protocol_type=OntologyAnnotation(term="material extraction"))
study.protocols.append(extraction_protocol)
sequencing_protocol = Protocol(
name='sequencing',
protocol_type=OntologyAnnotation(term="material sequencing"))
study.protocols.append(sequencing_protocol)
# To build out assay graphs, we enumereate the samples from the
# study-level, and for each sample we create an extraction process and
# a sequencing process. The extraction process takes as input a sample
# material, and produces an extract material. The sequencing process
# takes the extract material and produces a data file. This will
# produce three graphs, from sample material through to data, as follows:
#
# (sample_material-0)->(extraction)->(extract-0)->(sequencing)->
# (sequenced-data-0)
# (sample_material-1)->(extraction)->(extract-1)->(sequencing)->
# (sequenced-data-1)
# (sample_material-2)->(extraction)->(extract-2)->(sequencing)->
# (sequenced-data-2)
#
# Note that the extraction processes and sequencing processes are
# distinctly separate instances, where the three
# graphs are NOT interconnected.
for i, sample in enumerate(study.samples):
# create an extraction process that executes the extraction protocol
extraction_process = Process(executes_protocol=extraction_protocol)
# extraction process takes as input a sample, and produces an extract
# material as output
extraction_process.inputs.append(sample)
material = Material(name="extract-{}".format(i))
material.type = "Extract Name"
extraction_process.outputs.append(material)
# create a sequencing process that executes the sequencing protocol
sequencing_process = Process(executes_protocol=sequencing_protocol)
sequencing_process.name = "assay-name-{}".format(i)
sequencing_process.inputs.append(extraction_process.outputs[0])
# Sequencing process usually has an output data file
datafile = DataFile(filename="sequenced-data-{}".format(i),
label="Raw Data File",
generated_from=[sample])
sequencing_process.outputs.append(datafile)
# ensure Processes are linked
plink(sequencing_process, extraction_process)
# make sure the extract, data file, and the processes are attached to
# the assay
assay.samples.append(sample)
assay.data_files.append(datafile)
assay.other_material.append(material)
assay.process_sequence.append(extraction_process)
assay.process_sequence.append(sequencing_process)
assay.measurement_type = OntologyAnnotation(term="gene sequencing")
assay.technology_type = OntologyAnnotation(
term="nucleotide sequencing")
# attach the assay to the study
study.assays.append(assay)
import json
from isatools.isajson import ISAJSONEncoder
# To write JSON out, use the ISAJSONEncoder class with the json package
# and use dump() or dumps(). Note that the extra parameters sort_keys,
# indent and separators are to make the output more human-readable.
return json.dumps(investigation,
cls=ISAJSONEncoder,
sort_keys=True,
indent=4,
separators=(',', ': '))
def create_descriptor():
"""
Returns a simple but complete ISA-Tab 1.0 descriptor for illustration.
"""
# Create an empty Investigation object and set some values to the instance
# variables.
investigation = Investigation()
investigation.identifier = "i1"
investigation.title = "My Simple ISA Investigation"
investigation.description = \
"We could alternatively use the class constructor's parameters to " \
"set some default values at the time of creation, however we want " \
"to demonstrate how to use the object's instance variables to " \
"set values."
investigation.submission_date = "2016-11-03"
investigation.public_release_date = "2016-11-03"
# Create an empty Study object and set some values. The Study must have a
# filename, otherwise when we serialize it to ISA-Tab we would not know
# where to write it. We must also attach the study to the investigation by
# adding it to the 'investigation' object's list of studies.
study = Study(filename="s_study.txt")
study.identifier = "s1"
study.title = "My ISA Study"
study.description = \
"Like with the Investigation, we could use the class constructor to " \
"set some default values, but have chosen to demonstrate in this " \
"example the use of instance variables to set initial values."
study.submission_date = "2016-11-03"
study.public_release_date = "2016-11-03"
investigation.studies.append(study)
# Some instance variables are typed with different objects and lists of
# objects. For example, a Study can have a list of design descriptors. A
# design descriptor is an Ontology Annotation describing the kind of study
# at hand. Ontology Annotations should typically reference an Ontology
# Source. We demonstrate a mix of using the class constructors and setting
# values with instance variables. Note that the OntologyAnnotation object
# 'intervention_design' links its 'term_source' directly to the 'obi'
# object instance. To ensure the OntologySource is encapsulated in the
# descriptor, it is added to a list of 'ontology_source_references' in
# the Investigation object. The 'intervention_design' object is then
# added to the list of 'design_descriptors' held by the Study object.
obi = OntologySource(
name='OBI',
description="Ontology for Biomedical Investigations")
investigation.ontology_source_references.append(obi)
intervention_design = OntologyAnnotation(term_source=obi)
intervention_design.term = "intervention design"
intervention_design.term_accession = \
"http://purl.obolibrary.org/obo/OBI_0000115"
study.design_descriptors.append(intervention_design)
# Other instance variables common to both Investigation and Study objects
# include 'contacts' and 'publications', each with lists of corresponding
# Person and Publication objects.
contact = Person(
first_name="Alice",
last_name="Robertson",
affiliation="University of Life",
roles=[
OntologyAnnotation(
term='submitter')])
study.contacts.append(contact)
publication = Publication(
title="Experiments with Elephants",
author_list="A. Robertson, B. Robertson")
publication.pubmed_id = "12345678"
publication.status = OntologyAnnotation(term="published")
study.publications.append(publication)
# To create the study graph that corresponds to the contents of the study
# table file (the s_*.txt file), we need to create a process sequence.
# To do this we use the Process class and attach it to the Study object's
# 'process_sequence' list instance variable. Each process must be linked
# with a Protocol object that is attached to a Study object's 'protocols'
# list instance variable. The sample collection Process object usually has
# as input a Source material and as output a Sample material.
# Here we create one Source material object and attach it to our study.
source = Source(name='source_material')
study.sources.append(source)
# Then we create three Sample objects, with organism as H**o Sapiens, and
# attach them to the study. We use the utility function
# batch_create_material() to clone a prototype material object. The
# function automatiaclly appends an index to the material name. In this
# case, three samples will be created, with the names 'sample_material-0',
# 'sample_material-1' and 'sample_material-2'.
prototype_sample = Sample(name='sample_material', derives_from=[source])
ncbitaxon = OntologySource(name='NCBITaxon', description="NCBI Taxonomy")
characteristic_organism = Characteristic(
category=OntologyAnnotation(term="Organism"),
value=OntologyAnnotation(
term="H**o Sapiens",
term_source=ncbitaxon,
term_accession="http://purl.bioontology.org/ontology/NCBITAXON/"
"9606"))
prototype_sample.characteristics.append(characteristic_organism)
study.samples = batch_create_materials(
prototype_sample, n=3) # creates a batch of 3 samples
# Now we create a single Protocol object that represents our
# sample collection protocol, and attach it to the study object. Protocols
# must be declared before we describe Processes, as a processing event of
# some sort must execute some defined protocol. In the case of the class
# model, Protocols should therefore be declared before Processes in order
# for the Process to be linked to one.
sample_collection_protocol = Protocol(
name="sample collection",
protocol_type=OntologyAnnotation(term="sample collection"))
study.protocols.append(sample_collection_protocol)
sample_collection_process = Process(
executes_protocol=sample_collection_protocol)
# Next, we link our materials to the Process. In this particular case,
# we are describing a sample collection process that takes one
# source material, and produces three different samples.
#
# (source_material)->(sample collection)->[(sample_material-0),
# (sample_material-1), (sample_material-2)]
for src in study.sources:
sample_collection_process.inputs.append(src)
for sam in study.samples:
sample_collection_process.outputs.append(sam)
# Finally, attach the finished Process object to the study
# process_sequence. This can be done many times to
# describe multiple sample collection events.
study.process_sequence.append(sample_collection_process)
# Next, we build n Assay object and attach two protocols, extraction and
# sequencing.
assay = Assay(filename="a_assay.txt")
extraction_protocol = Protocol(
name='extraction',
protocol_type=OntologyAnnotation(
term="material extraction"))
study.protocols.append(extraction_protocol)
sequencing_protocol = Protocol(
name='sequencing',
protocol_type=OntologyAnnotation(
term="material sequencing"))
study.protocols.append(sequencing_protocol)
# To build out assay graphs, we enumereate the samples from the
# study-level, and for each sample we create an extraction process and a
# sequencing process. The extraction process takes as input a
# sample material, and produces an extract material. The sequencing
# process takes the extract material and produces a data file. This will
# produce three graphs, from sample material through to data, as follows:
#
# (sample_material-0)->(extraction)->(extract-0)->(sequencing)->
# (sequenced-data-0)
# (sample_material-1)->(extraction)->(extract-1)->(sequencing)->
# (sequenced-data-1)
# (sample_material-2)->(extraction)->(extract-2)->(sequencing)->
# (sequenced-data-2)
#
# Note that the extraction processes and sequencing processes are
# distinctly separate instances, where the three graphs are NOT
# interconnected.
for i, sample in enumerate(study.samples):
# create an extraction process that executes the extraction protocol
extraction_process = Process(executes_protocol=extraction_protocol)
# extraction process takes as input a sample, and produces an extract
# material as output
extraction_process.inputs.append(sample)
material = Material(name="extract-{}".format(i))
material.type = "Extract Name"
extraction_process.outputs.append(material)
# create a sequencing process that executes the sequencing protocol
sequencing_process = Process(executes_protocol=sequencing_protocol)
sequencing_process.name = "assay-name-{}".format(i)
sequencing_process.inputs.append(extraction_process.outputs[0])
# Sequencing process usually has an output data file
datafile = DataFile(
filename="sequenced-data-{}".format(i),
label="Raw Data File",
generated_from=[sample])
sequencing_process.outputs.append(datafile)
# ensure Processes are linked forward and backward
plink(extraction_process, sequencing_process)
# make sure the extract, data file, and the processes are attached to
# the assay
assay.samples.append(sample)
assay.data_files.append(datafile)
assay.other_material.append(material)
assay.process_sequence.append(extraction_process)
assay.process_sequence.append(sequencing_process)
assay.measurement_type = OntologyAnnotation(term="gene sequencing")
assay.technology_type = OntologyAnnotation(
term="nucleotide sequencing")
# attach the assay to the study
study.assays.append(assay)
from isatools import isatab
# dumps() writes out the ISA as a string representation of the ISA-Tab
return isatab.dumps(investigation)