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135 changes: 135 additions & 0 deletions .gitignore
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# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class

# C extensions
*.so

# Distribution / packaging
.Python
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
pip-wheel-metadata/
share/python-wheels/
*.egg-info/
.installed.cfg
*.egg
MANIFEST

# PyInstaller
# Usually these files are written by a python script from a template
# before PyInstaller builds the exe, so as to inject date/other infos into it.
*.manifest
*.spec

# Installer logs
pip-log.txt
pip-delete-this-directory.txt

# Unit test / coverage reports
htmlcov/
.tox/
.nox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
*.py,cover
.hypothesis/
.pytest_cache/
cover/

# Translations
*.mo
*.pot

# Django stuff:
*.log
local_settings.py
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db.sqlite3-journal

# Flask stuff:
instance/
.webassets-cache

# Scrapy stuff:
.scrapy

# Sphinx documentation
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# PyBuilder
target/

# Jupyter Notebook
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# IPython
profile_default/
ipython_config.py

# pyenv
# For a library or package, you might want to ignore these files since the code is
# intended to run in multiple environments; otherwise, check them in:
# .python-version

# pipenv
# According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
# However, in case of collaboration, if having platform-specific dependencies or dependencies
# having no cross-platform support, pipenv may install dependencies that don't work, or not
# install all needed dependencies.
#Pipfile.lock

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__pypackages__/

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*.sage.py

# Environments
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22 changes: 22 additions & 0 deletions LICENSE
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MIT License

Copyright (c) 2020 tkschmidt

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

120 changes: 120 additions & 0 deletions README.md
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# MasterSpectrum
This software was used for my master thesis in 2016. The aim was to find diagnostic ions and eventually remove them to improve identification of MS/MS spectra. It finally shined in 2018 as a tool to quickly find systematic side products of 21 post-translational protein modifications https://doi.org/10.1074/mcp.TIR118.000783.

The original filtering option was also the reason for repository name *mgf_filter*

## What is does?
**MasterSpectrum** is a representation of one or more spectra and consists of MasterPeaks.
The aggregation has to be fuzzy in m/z space because same measurenment of the same peptide can result in different decimal places. After inserting a spectrum into a Masterspectrum every peak is normalized to a relative value between [0, 1] based on the most
intense peak. This is necessary to provide an easier way to compare intensity between different measurenments.


Insertion of a peak triggers a search for similar MasterPeaks. A peak is defined as similar
to a MasterPeak if the peak lies within a predefined m/z window of a found MasterPeak.
These windows can be defined relative to the m/z value of the actual peak (ppm) or by
a fix distance (Da). As a standard setting for all analysis a windows size of 20 ppm was
used.

### A search can result in three different actions:
1. If no similar peak is found, a peak is converted to MasterPeak and is placed into MasterSpectrum according to its m/z value. Every new MasterPeak saves also the number of already aggregated peaks and its starting m/z value
2. If a similar peak is found, the search has to be further refined.
- If the next MasterPeak above or below the found m/z value is not similar to the searched peak, the first found MasterPeak and the inserted peak merge
- If the next MasterPeak above or below the found m/z is also similar to the searched peak, all three peaks are merged Merging of one or two MasterPeaks with a new peak results alwawys in a new MasterPeak. The M/z values are adjusted to the weighted average of all found MasterPeaks and the new peak.


To speed up insertion, all function calls that consist of numeric calculation (i) (re)calculation of m/z windows, (ii) weighted averages and (iii) normalisation were replaced with C functions.

Results of MasterSpectrum can be saved as a CSV file for analysis or reimported if more aggregation with additional MGF files is necessary.
Because MasterSpectrum allows a fast search in m/z space it was also used for different tasks e.g. creating a filter for peaks.
To ensure correctness of MasterSpectrum within its specification and because it works on loosly defined files as MGF files a test suit of 40 test cases for the basic implementation of MasterSpectrum was added. All test cases can be run with minimised real data and
takes about 20 seconds. After all a code coverage of about 82 % was achieved.

# Installation
The package is not (yet) pushed to Pypi, but it is easily installable via pip (requires a up-to-date pip version `pip install -U pip`)
```
pip install -e git+https://github.com/kusterlab/[email protected]#egg=mgf_filter
```

## Platform Dependency
MasterSpectrum is available on Windows, UNIX/Linux and Mac OSX and the only necessary dependency is a working Python installation and a C compiler.

# How to run it

```
MasterSpectrum create /MGF/PATH/lorem.mgf /tmp/ True
```
First argument => path to mgf
Second argument => output folder
Third argument => aggregation take **not** care of precursor charge

## Output

| mz | intensity | counts | left border | right border | start_mz | ms1_charge | rel_intensity_ratio | counts_ratio |
|------------------|--------------------|--------|------------------|------------------|-----------|------------|---------------------|--------------|
| 175.10254 | 0.0107771314851379 | 1 | 175.0990379492 | 175.1060420508 | 175.10254 | 0 | 0 | 0 |
| 175.106629101904 | 1.60120116043193 | 27 | 175.103126969322 | 175.110131234486 | 175.10474 | 0 | 0 | 0 |
| 175.1121535397 | 0.119175527922278 | 3 | 175.108651296629 | 175.115655782771 | 175.11229 | 0 | 0 | 0 |
| 175.119032460438 | 430.916364238763 | 4338 | 175.115530079789 | 175.122534841087 | 175.11354 | 0 | 0 | 0 |
| 175.133620190728 | 0.25654267792363 | 9 | 175.130117518324 | 175.137122863132 | 175.13344 | 0 | 0 | 0 |

### Explanation

| Output variable | explanation |
|--------------------- |------------------------------------------------------------------------------------- |
| mz | mz of the aggregated MasterPeak |
| intensity | intensity weighted m/z average of all peaks |
| | number of aggregated peaks in a MasterPeak |
| left border | left border of MasterPeak |
| right border | right border of MasterPeak |
| start_mz | original mz value of the first peak in a MasterPeak (to investigate drift of peaks) |
| ms1_charge | deprecated |
| rel_intensity_ratio | feature used for folded MasterSpectra |
| counts_ratio | feature used for folded MasterSpectra |


## Help
**MasterSpectrum** provides a lot of different functionalities and the help manual should provide a good starting point.

```
>>> MasterSpectrum -h
usage: MasterSpectrum [-h]
{create,fold,patch,bruteforce_patch,extract,precursor,mascotExclusion,seperateMgfbyScore,allDelta,reinstate,deleteAminoAcidDelta,apl}
...
mgf_filter
positional arguments:
{create,fold,patch,bruteforce_patch,extract,precursor,mascotExclusion,seperateMgfbyScore,allDelta,reinstate,deleteAminoAcidDelta,apl}
commands
create takes an MGF files and creates a MasterSpectrum based
on a 20 ppm window, it can ignore charges
fold it takes two MGF files and creates a relative spectrum
between both runs based on a 20 ppm window. it cant
ignore charges
patch creates a MasterSpectrum based on 1-N exclusion lists
bruteforce_patch creates a MasterSpectrum similar to the already
published results
extract extract important information from a pepxml
precursor generates a MasterSpectrum with m/z values relative to
precursor value
mascotExclusion delete peaks based on a provided peptide length and/or
an additional mass
seperateMgfbyScore generate two spectra seperated by a provided score
cuttoff
allDelta calculate all possible deltas given a minimal relative
intensity
reinstate takes two mgfs and reports difference in intensity
world as a new MGF file
deleteAminoAcidDelta
takes a list of possible amino acid deltas and deletes
such peaks in a MasterSpectrum
apl convert an folder full of apl files to a single MGF
file
optional arguments:
-h, --help show this help message and exit
```
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