OpenMS
DIAScoring Class Reference

Scoring of an spectrum at the peak apex of an chromatographic elution peak. More...

#include <OpenMS/ANALYSIS/OPENSWATH/DIAScoring.h>

Inheritance diagram for DIAScoring:
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Collaboration diagram for DIAScoring:
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Public Member Functions

Constructors and Destructor
 DIAScoring ()
 Default constructor. More...
 
 ~DIAScoring () override
 Destructor. More...
 
- Public Member Functions inherited from DefaultParamHandler
 DefaultParamHandler (const String &name)
 Constructor with name that is displayed in error messages. More...
 
 DefaultParamHandler (const DefaultParamHandler &rhs)
 Copy constructor. More...
 
virtual ~DefaultParamHandler ()
 Destructor. More...
 
DefaultParamHandleroperator= (const DefaultParamHandler &rhs)
 Assignment operator. More...
 
virtual bool operator== (const DefaultParamHandler &rhs) const
 Equality operator. More...
 
void setParameters (const Param &param)
 Sets the parameters. More...
 
const ParamgetParameters () const
 Non-mutable access to the parameters. More...
 
const ParamgetDefaults () const
 Non-mutable access to the default parameters. More...
 
const StringgetName () const
 Non-mutable access to the name. More...
 
void setName (const String &name)
 Mutable access to the name. More...
 
const std::vector< String > & getSubsections () const
 Non-mutable access to the registered subsections. More...
 

Private Types

typedef OpenSwath::SpectrumPtr SpectrumPtrType
 Type definitions. More...
 
typedef OpenSwath::LightTransition TransitionType
 Transition interface (Transition, Peptide, Protein) More...
 

DIA Scores

double dia_extract_window_
 
double dia_byseries_intensity_min_
 
double dia_byseries_ppm_diff_
 
double dia_nr_isotopes_
 
double dia_nr_charges_
 
double peak_before_mono_max_ppm_diff_
 
bool dia_extraction_ppm_
 
bool dia_centroided_
 
TheoreticalSpectrumGeneratorgenerator
 
void dia_isotope_scores (const std::vector< TransitionType > &transitions, SpectrumPtrType spectrum, OpenSwath::IMRMFeature *mrmfeature, double &isotope_corr, double &isotope_overlap) const
 Isotope scores, see class description. More...
 
void dia_massdiff_score (const std::vector< TransitionType > &transitions, const SpectrumPtrType &spectrum, const std::vector< double > &normalized_library_intensity, double &ppm_score, double &ppm_score_weighted, std::vector< double > &diff_ppm) const
 Massdiff scores, see class description. More...
 
bool dia_ms1_massdiff_score (double precursor_mz, SpectrumPtrType spectrum, double &ppm_score) const
 
void dia_ms1_isotope_scores_averagine (double precursor_mz, const SpectrumPtrType &spectrum, double &isotope_corr, double &isotope_overlap, int charge_state) const
 Precursor isotope scores for precursors (peptides and metabolites) More...
 
void dia_ms1_isotope_scores (double precursor_mz, const SpectrumPtrType &spectrum, double &isotope_corr, double &isotope_overlap, const EmpiricalFormula &sum_formula) const
 
void dia_by_ion_score (const SpectrumPtrType &spectrum, AASequence &sequence, int charge, double &bseries_score, double &yseries_score) const
 b/y ion scores More...
 
void score_with_isotopes (SpectrumPtrType spectrum, const std::vector< TransitionType > &transitions, double &dotprod, double &manhattan) const
 Dotproduct / Manhattan score with theoretical spectrum. More...
 
 DIAScoring (const DIAScoring &rhs)
 Copy constructor (algorithm class) More...
 
DIAScoringoperator= (const DIAScoring &rhs)
 Assignment operator (algorithm class) More...
 
void updateMembers_ () override
 Synchronize members with param class. More...
 
void diaIsotopeScoresSub_ (const std::vector< TransitionType > &transitions, const SpectrumPtrType &spectrum, std::map< std::string, double > &intensities, double &isotope_corr, double &isotope_overlap) const
 Subfunction of dia_isotope_scores. More...
 
void getFirstIsotopeRelativeIntensities_ (const std::vector< TransitionType > &transitions, OpenSwath::IMRMFeature *mrmfeature, std::map< std::string, double > &intensities) const
 
void largePeaksBeforeFirstIsotope_ (const SpectrumPtrType &spectrum, double mono_mz, double mono_int, int &nr_occurrences, double &max_ratio) const
 Determine whether the current m/z value is a monoisotopic peak. More...
 
double scoreIsotopePattern_ (const std::vector< double > &isotopes_int, double product_mz, int putative_fragment_charge) const
 Compare an experimental isotope pattern to a theoretical one. More...
 
double scoreIsotopePattern_ (const std::vector< double > &isotopes_int, const EmpiricalFormula &sum_formula) const
 Compare an experimental isotope pattern to a theoretical one. More...
 
double scoreIsotopePattern_ (const std::vector< double > &isotopes_int, const IsotopeDistribution &isotope_dist) const
 Compare an experimental isotope pattern to a theoretical one. More...
 
void getIsotopeIntysFromExpSpec_ (double precursor_mz, const SpectrumPtrType &spectrum, std::vector< double > &isotopes_int, int charge_state) const
 

Additional Inherited Members

- Static Public Member Functions inherited from DefaultParamHandler
static void writeParametersToMetaValues (const Param &write_this, MetaInfoInterface &write_here, const String &key_prefix="")
 Writes all parameters to meta values. More...
 
- Protected Member Functions inherited from DefaultParamHandler
void defaultsToParam_ ()
 Updates the parameters after the defaults have been set in the constructor. More...
 
- Protected Attributes inherited from DefaultParamHandler
Param param_
 Container for current parameters. More...
 
Param defaults_
 Container for default parameters. This member should be filled in the constructor of derived classes! More...
 
std::vector< Stringsubsections_
 Container for registered subsections. This member should be filled in the constructor of derived classes! More...
 
String error_name_
 Name that is displayed in error messages during the parameter checking. More...
 
bool check_defaults_
 If this member is set to false no checking if parameters in done;. More...
 
bool warn_empty_defaults_
 If this member is set to false no warning is emitted when defaults are empty;. More...
 

Detailed Description

Scoring of an spectrum at the peak apex of an chromatographic elution peak.

In DIA (data independent acquisition) / SWATH analysis, at each chromatographic point a full MS2 spectrum is recorded. This class allows to compute a number of scores based on the full MS2 spectrum available. The scores are the following:

  • isotope scores: – isotope_corr: computes the correlation of each fragment ion with the theoretical isotope distribution. This is the pearson correlation to the theoretical isotope pattern weighted by the relative intensity of the transition (more is better). – isotope_overlap: checks whether a signal at position (mz - 1) / charge exists and how strong it is. This would be an indication that the current peak is an isotopic signal of another peak. This simply counts how often a peak was observed that is higher than the current peak, thus number is then weighted by the relative intensity of the transition (thus less is better here).
  • massdiff score: computes the difference in ppm of the experimental signal to the expected signal (thus less is better)
  • b/y ion score: checks for the presence of b/y ions of the peptide in question
  • theoretical spectrum: a dotproduct and a manhattan score with a theoretical spectrum

This class expects spectra objects that implement the OpenSWATH Spectrum interface. Transitions are expected to be in the light transition format (defined in OPENSWATHALGO/DATAACCESS/TransitionExperiment.h).

Parameters of this class are:

NameTypeDefaultRestrictionsDescription
dia_extraction_window float0.05 min: 0.0DIA extraction window in Th or ppm.
dia_extraction_unit stringTh Th, ppmDIA extraction window unit
dia_centroided stringfalse true, falseUse centroided DIA data.
dia_byseries_intensity_min float300.0 min: 0.0DIA b/y series minimum intensity to consider.
dia_byseries_ppm_diff float10.0 min: 0.0DIA b/y series minimal difference in ppm to consider.
dia_nr_isotopes int4 min: 0DIA number of isotopes to consider.
dia_nr_charges int4 min: 0DIA number of charges to consider.
peak_before_mono_max_ppm_diff float20.0 min: 0.0DIA maximal difference in ppm to count a peak at lower m/z when searching for evidence that a peak might not be monoisotopic.

Note:
  • If a section name is documented, the documentation is displayed as tooltip.
  • Advanced parameter names are italic.

Member Typedef Documentation

◆ SpectrumPtrType

Type definitions.

Spectrum type, see Spectrum interface

◆ TransitionType

Transition interface (Transition, Peptide, Protein)

Constructor & Destructor Documentation

◆ DIAScoring() [1/2]

Default constructor.

◆ ~DIAScoring()

~DIAScoring ( )
override

Destructor.

◆ DIAScoring() [2/2]

DIAScoring ( const DIAScoring rhs)
private

Copy constructor (algorithm class)

Member Function Documentation

◆ dia_by_ion_score()

void dia_by_ion_score ( const SpectrumPtrType spectrum,
AASequence sequence,
int  charge,
double &  bseries_score,
double &  yseries_score 
) const

b/y ion scores

◆ dia_isotope_scores()

void dia_isotope_scores ( const std::vector< TransitionType > &  transitions,
SpectrumPtrType  spectrum,
OpenSwath::IMRMFeature mrmfeature,
double &  isotope_corr,
double &  isotope_overlap 
) const

Isotope scores, see class description.

◆ dia_massdiff_score()

void dia_massdiff_score ( const std::vector< TransitionType > &  transitions,
const SpectrumPtrType spectrum,
const std::vector< double > &  normalized_library_intensity,
double &  ppm_score,
double &  ppm_score_weighted,
std::vector< double > &  diff_ppm 
) const

Massdiff scores, see class description.

◆ dia_ms1_isotope_scores()

void dia_ms1_isotope_scores ( double  precursor_mz,
const SpectrumPtrType spectrum,
double &  isotope_corr,
double &  isotope_overlap,
const EmpiricalFormula sum_formula 
) const

◆ dia_ms1_isotope_scores_averagine()

void dia_ms1_isotope_scores_averagine ( double  precursor_mz,
const SpectrumPtrType spectrum,
double &  isotope_corr,
double &  isotope_overlap,
int  charge_state 
) const

Precursor isotope scores for precursors (peptides and metabolites)

◆ dia_ms1_massdiff_score()

bool dia_ms1_massdiff_score ( double  precursor_mz,
SpectrumPtrType  spectrum,
double &  ppm_score 
) const

Precursor massdifference score

Parameters
precursor_mzExact m/z of the precursor to be evaluated
spectrumMS1 spectrum to be evaluated
ppm_scoreResulting score
Returns
False if no signal was found (and no sensible score calculated), true otherwise

◆ diaIsotopeScoresSub_()

void diaIsotopeScoresSub_ ( const std::vector< TransitionType > &  transitions,
const SpectrumPtrType spectrum,
std::map< std::string, double > &  intensities,
double &  isotope_corr,
double &  isotope_overlap 
) const
private

Subfunction of dia_isotope_scores.

◆ getFirstIsotopeRelativeIntensities_()

void getFirstIsotopeRelativeIntensities_ ( const std::vector< TransitionType > &  transitions,
OpenSwath::IMRMFeature mrmfeature,
std::map< std::string, double > &  intensities 
) const
private

retrieves intensities from MRMFeature computes a vector of relative intensities for each feature (output to intensities)

◆ getIsotopeIntysFromExpSpec_()

void getIsotopeIntysFromExpSpec_ ( double  precursor_mz,
const SpectrumPtrType spectrum,
std::vector< double > &  isotopes_int,
int  charge_state 
) const
private

Get the intensities of isotopes around precursor_mz in experimental spectrum and fill isotopes_int.

◆ largePeaksBeforeFirstIsotope_()

void largePeaksBeforeFirstIsotope_ ( const SpectrumPtrType spectrum,
double  mono_mz,
double  mono_int,
int &  nr_occurrences,
double &  max_ratio 
) const
private

Determine whether the current m/z value is a monoisotopic peak.

This function will try to determine whether the current peak is a monoisotopic peak or not. It will do so by searching for an intense peak at a lower m/z that could explain the current peak as part of a isotope pattern.

Parameters
spectrumThe spectrum (MS1 or MS2)
mono_mzThe m/z value where a monoisotopic is expected
mono_intThe intensity of the monoisotopic peak (peak at mono_mz)
nr_occurrencesWill contain the count of how often a peak is found at lower m/z than mono_mz with an intensity higher than mono_int. Multiple charge states are tested, see class parameter dia_nr_charges_
nr_occurrencesWill contain the maximum ratio of a peaks intensity compared to the monoisotopic peak intensity how often a peak is found at lower m/z than mono_mz with an intensity higher than mono_int. Multiple charge states are tested, see class parameter dia_nr_charges_

◆ operator=()

DIAScoring& operator= ( const DIAScoring rhs)
private

Assignment operator (algorithm class)

◆ score_with_isotopes()

void score_with_isotopes ( SpectrumPtrType  spectrum,
const std::vector< TransitionType > &  transitions,
double &  dotprod,
double &  manhattan 
) const

Dotproduct / Manhattan score with theoretical spectrum.

◆ scoreIsotopePattern_() [1/3]

double scoreIsotopePattern_ ( const std::vector< double > &  isotopes_int,
const EmpiricalFormula sum_formula 
) const
private

Compare an experimental isotope pattern to a theoretical one.

This function will take an array of isotope intensities and compare them (by order only; no m/z matching) to the theoretically expected ones for the given sum_formula. The returned value is a Pearson correlation between the experimental and theoretical pattern.

◆ scoreIsotopePattern_() [2/3]

double scoreIsotopePattern_ ( const std::vector< double > &  isotopes_int,
const IsotopeDistribution isotope_dist 
) const
private

Compare an experimental isotope pattern to a theoretical one.

This function will take an array of isotope intensities and compare them (by order only; no m/z matching) to the theoretically expected ones given by isotope_dist. The returned value is a Pearson correlation between the experimental and theoretical pattern.

◆ scoreIsotopePattern_() [3/3]

double scoreIsotopePattern_ ( const std::vector< double > &  isotopes_int,
double  product_mz,
int  putative_fragment_charge 
) const
private

Compare an experimental isotope pattern to a theoretical one.

This function will take an array of isotope intensities isotopes_int and compare them (by order only; no m/z matching) to the theoretically expected ones for the given product_mz using an averagine model. The returned value is a Pearson correlation between the experimental and theoretical pattern.

◆ updateMembers_()

void updateMembers_ ( )
overrideprivatevirtual

Synchronize members with param class.

Reimplemented from DefaultParamHandler.

Member Data Documentation

◆ dia_byseries_intensity_min_

double dia_byseries_intensity_min_
private

◆ dia_byseries_ppm_diff_

double dia_byseries_ppm_diff_
private

◆ dia_centroided_

bool dia_centroided_
private

◆ dia_extract_window_

double dia_extract_window_
private

◆ dia_extraction_ppm_

bool dia_extraction_ppm_
private

◆ dia_nr_charges_

double dia_nr_charges_
private

◆ dia_nr_isotopes_

double dia_nr_isotopes_
private

◆ generator

TheoreticalSpectrumGenerator* generator
private

◆ peak_before_mono_max_ppm_diff_

double peak_before_mono_max_ppm_diff_
private