public void CalculateSequenceCoverage()
{
var proteinsWithUnambigSeqPsms = new Dictionary <Protein, List <PeptideWithSetModifications> >();
var proteinsWithPsmsWithLocalizedMods = new Dictionary <Protein, List <PeptideWithSetModifications> >();
foreach (var protein in Proteins)
{
proteinsWithUnambigSeqPsms.Add(protein, new List <PeptideWithSetModifications>());
proteinsWithPsmsWithLocalizedMods.Add(protein, new List <PeptideWithSetModifications>());
}
foreach (var psm in AllPsmsBelowOnePercentFDR)
{
// null BaseSequence means that the amino acid sequence is ambiguous; do not use these to calculate sequence coverage
if (psm.BaseSequence != null)
{
var peptides = psm.BestMatchingPeptides.Select(p => p.Peptide);
foreach (var peptide in peptides)
{
// might be unambiguous but also shared; make sure this protein group contains this peptide+protein combo
if (Proteins.Contains(peptide.Protein))
{
proteinsWithUnambigSeqPsms[peptide.Protein].Add(peptide);
// null FullSequence means that mods were not successfully localized; do not display them on the sequence coverage mods info
if (psm.FullSequence != null)
{
proteinsWithPsmsWithLocalizedMods[peptide.Protein].Add(peptide);
}
}
}
}
}
foreach (var protein in ListOfProteinsOrderedByAccession)
{
HashSet <int> coveredOneBasedResidues = new HashSet <int>();
// get residue numbers of each peptide in the protein and identify them as observed if the sequence is unambiguous
foreach (var peptide in proteinsWithUnambigSeqPsms[protein])
{
for (int i = peptide.OneBasedStartResidueInProtein; i <= peptide.OneBasedEndResidueInProtein; i++)
{
coveredOneBasedResidues.Add(i);
}
}
// calculate sequence coverage percent
double seqCoverageFract = (double)coveredOneBasedResidues.Count / protein.Length;
// add the percent coverage
SequenceCoverageFraction.Add(seqCoverageFract);
// convert the observed amino acids to upper case if they are unambiguously observed
string sequenceCoverageDisplay = protein.BaseSequence.ToLower();
var coverageArray = sequenceCoverageDisplay.ToCharArray();
foreach (var obsResidueLocation in coveredOneBasedResidues)
{
coverageArray[obsResidueLocation - 1] = char.ToUpper(coverageArray[obsResidueLocation - 1]);
}
sequenceCoverageDisplay = new string(coverageArray);
// add the coverage display
SequenceCoverageDisplayList.Add(sequenceCoverageDisplay);
// put mods in the sequence coverage display
// get mods to display in sequence (only unambiguously identified mods)
var modsOnThisProtein = new HashSet <KeyValuePair <int, Modification> >();
foreach (var pep in proteinsWithPsmsWithLocalizedMods[protein])
{
foreach (var mod in pep.AllModsOneIsNterminus)
{
if (!mod.Value.ModificationType.Contains("PeptideTermMod") &&
!mod.Value.ModificationType.Contains("Common Variable") &&
!mod.Value.ModificationType.Contains("Common Fixed"))
{
modsOnThisProtein.Add(new KeyValuePair <int, Modification>(pep.OneBasedStartResidueInProtein + mod.Key - 2, mod.Value));
}
}
}
var tempMods = modsOnThisProtein.OrderBy(p => p.Key).ToList();
foreach (var mod in tempMods)
{
if (mod.Value.LocationRestriction.Equals("N-terminal."))
{
sequenceCoverageDisplay = sequenceCoverageDisplay.Insert(
0,
$"[{mod.Value.IdWithMotif}]-");
}
else if (mod.Value.LocationRestriction.Equals("Anywhere."))
{
int modStringIndex = sequenceCoverageDisplay.Length - (protein.Length - mod.Key);
sequenceCoverageDisplay = sequenceCoverageDisplay.Insert(
modStringIndex,
$"[{mod.Value.IdWithMotif}]");
}
else if (mod.Value.LocationRestriction.Equals("C-terminal."))
{
sequenceCoverageDisplay = sequenceCoverageDisplay.Insert(
sequenceCoverageDisplay.Length,
$"-[{mod.Value.IdWithMotif}]");
}
}
SequenceCoverageDisplayListWithMods.Add(sequenceCoverageDisplay);
if (!modsOnThisProtein.Any())
{
continue;
}
// calculate spectral count % of modified observations
var pepModTotals = new List <int>(); // count of modified peptides for each mod/index
var pepTotals = new List <int>(); // count of all peptides for each mod/index
var modIndex = new List <(int index, string modName)>(); // index and name of the modified position
foreach (var pep in proteinsWithPsmsWithLocalizedMods[protein])
{
foreach (var mod in pep.AllModsOneIsNterminus)
{
int pepNumTotal = 0; //For one mod, The total Pep Num
if (mod.Value.ModificationType.Contains("Common Variable") ||
mod.Value.ModificationType.Contains("Common Fixed") ||
mod.Value.LocationRestriction.Equals(ModLocationOnPeptideOrProtein.PepC) ||
mod.Value.LocationRestriction.Equals(ModLocationOnPeptideOrProtein.NPep))
{
continue;
}
int indexInProtein;
if (mod.Value.LocationRestriction.Equals("N-terminal."))
{
indexInProtein = 1;
}
else if (mod.Value.LocationRestriction.Equals("Anywhere."))
{
indexInProtein = pep.OneBasedStartResidueInProtein + mod.Key - 2;
}
else if (mod.Value.LocationRestriction.Equals("C-terminal."))
{
indexInProtein = protein.Length;
}
else
{
// In case it's a peptide terminal mod, skip!
// we don't want this annotated in the protein's modifications
continue;
}
var modKey = (indexInProtein, mod.Value.IdWithMotif);
if (modIndex.Contains(modKey))
{
pepModTotals[modIndex.IndexOf(modKey)] += 1;
}
else
{
modIndex.Add(modKey);
foreach (var pept in proteinsWithPsmsWithLocalizedMods[protein])
{
if (indexInProtein >= pept.OneBasedStartResidueInProtein - (indexInProtein == 1 ? 1 : 0) &&
indexInProtein <= pept.OneBasedEndResidueInProtein)
{
pepNumTotal += 1;
}
}
pepTotals.Add(pepNumTotal);
pepModTotals.Add(1);
}
}
}
var modStrings = new List <(int aaNum, string part)>();
for (int i = 0; i < pepModTotals.Count; i++)
{
string aa = modIndex[i].index.ToString();
string modName = modIndex[i].modName.ToString();
string occupancy = ((double)pepModTotals[i] / (double)pepTotals[i]).ToString("F2");
string fractOccupancy = $"{pepModTotals[i].ToString()}/{pepTotals[i].ToString()}";
string tempString = ($"#aa{aa}[{modName},info:occupancy={occupancy}({fractOccupancy})]");
modStrings.Add((modIndex[i].index, tempString));
}
var modInfoString = string.Join(";", modStrings.OrderBy(x => x.aaNum).Select(x => x.part));
if (!string.IsNullOrEmpty(modInfoString))
{
ModsInfo.Add(modInfoString);
}
}
}
public void CalculateSequenceCoverage()
{
var proteinsWithUnambigSeqPsms = new Dictionary <Protein, List <PeptideWithSetModifications> >();
var proteinsWithPsmsWithLocalizedMods = new Dictionary <Protein, List <PeptideWithSetModifications> >();
foreach (var protein in Proteins)
{
proteinsWithUnambigSeqPsms.Add(protein, new List <PeptideWithSetModifications>());
proteinsWithPsmsWithLocalizedMods.Add(protein, new List <PeptideWithSetModifications>());
}
foreach (var psm in AllPsmsBelowOnePercentFDR)
{
// null BaseSequence means that the amino acid sequence is ambiguous; do not use these to calculate sequence coverage
if (psm.BaseSequence != null)
{
var peptides = psm.BestMatchingPeptides.Select(p => p.Peptide);
foreach (var peptide in peptides)
{
// might be unambiguous but also shared; make sure this protein group contains this peptide+protein combo
if (Proteins.Contains(peptide.Protein))
{
proteinsWithUnambigSeqPsms[peptide.Protein].Add(peptide);
// null FullSequence means that mods were not successfully localized; do not display them on the sequence coverage mods info
if (psm.FullSequence != null)
{
proteinsWithPsmsWithLocalizedMods[peptide.Protein].Add(peptide);
}
}
}
}
}
foreach (var protein in ListOfProteinsOrderedByAccession)
{
bool errorResult = false;
var sequenceCoverageDisplay = protein.BaseSequence.ToLower(CultureInfo.InvariantCulture);
HashSet <int> coveredOneBasedResidues = new HashSet <int>();
// get residue numbers of each peptide in the protein and identify them as observed if the sequence is unambiguous
foreach (var peptide in proteinsWithUnambigSeqPsms[protein])
{
string sequenceExtractedFromProtein = "";
for (int i = peptide.OneBasedStartResidueInProtein; i <= peptide.OneBasedEndResidueInProtein; i++)
{
// check for bugs in sequence coverage; make sure we have the right amino acids!
sequenceExtractedFromProtein += sequenceCoverageDisplay[i - 1];
coveredOneBasedResidues.Add(i);
}
if (!sequenceExtractedFromProtein.ToUpper().Equals(peptide.BaseSequence))
{
errorResult = true;
}
}
// calculate sequence coverage percent
double seqCoverageFract = (double)coveredOneBasedResidues.Count / protein.Length;
if (seqCoverageFract > 1)
{
errorResult = true;
}
// add the percent coverage or NaN if there was an error
if (!errorResult)
{
SequenceCoverageFraction.Add(seqCoverageFract);
}
else
{
SequenceCoverageFraction.Add(double.NaN);
}
// convert the observed amino acids to upper case if they are unambiguously observed
var coverageArray = sequenceCoverageDisplay.ToCharArray();
foreach (var obsResidueLocation in coveredOneBasedResidues)
{
coverageArray[obsResidueLocation - 1] = char.ToUpper(coverageArray[obsResidueLocation - 1]);
}
sequenceCoverageDisplay = new string(coverageArray);
// check to see if there was an errored result; if not, add the coverage display
if (!errorResult)
{
SequenceCoverageDisplayList.Add(sequenceCoverageDisplay);
}
else
{
SequenceCoverageDisplayList.Add("Error calculating sequence coverage");
}
// put mods in the sequence coverage display
if (!errorResult)
{
// get mods to display in sequence (only unambiguously identified mods)
var modsOnThisProtein = new HashSet <KeyValuePair <int, Modification> >();
foreach (var pep in proteinsWithPsmsWithLocalizedMods[protein])
{
foreach (var mod in pep.AllModsOneIsNterminus)
{
if (!mod.Value.ModificationType.Contains("PeptideTermMod") && !mod.Value.ModificationType.Contains("Common Variable") && !mod.Value.ModificationType.Contains("Common Fixed"))
{
modsOnThisProtein.Add(new KeyValuePair <int, Modification>(pep.OneBasedStartResidueInProtein + mod.Key - 2, mod.Value));
}
}
}
var temp1 = modsOnThisProtein.OrderBy(p => p.Key).ToList();
foreach (var mod in temp1)
{
if (mod.Value.LocationRestriction.Equals("N-terminal."))
{
sequenceCoverageDisplay = sequenceCoverageDisplay.Insert(0, "[" + mod.Value.IdWithMotif + "]-");
}
else if (mod.Value.LocationRestriction.Equals("Anywhere."))
{
int modStringIndex = sequenceCoverageDisplay.Length - (protein.Length - mod.Key);
sequenceCoverageDisplay = sequenceCoverageDisplay.Insert(modStringIndex, "[" + mod.Value.IdWithMotif + "]");
}
else if (mod.Value.LocationRestriction.Equals("C-terminal."))
{
sequenceCoverageDisplay = sequenceCoverageDisplay.Insert(sequenceCoverageDisplay.Length, "-[" + mod.Value.IdWithMotif + "]");
}
}
SequenceCoverageDisplayListWithMods.Add(sequenceCoverageDisplay);
if (modsOnThisProtein.Any())
{
// calculate spectral count percentage of modified observation
string tempModStrings = ""; //The whole string
List <int> tempPepModTotals = new List <int>(); //The List of (For one mod, The Modified Pep Num)
List <int> tempPepTotals = new List <int>(); //The List of (For one mod, The total Pep Num)
List <string> tempPepModValues = new List <string>(); //The List of (For one mod, the Modified Name)
List <int> tempModIndex = new List <int>(); //The Index of the modified position.
foreach (var pep in proteinsWithPsmsWithLocalizedMods[protein])
{
foreach (var mod in pep.AllModsOneIsNterminus)
{
int tempPepNumTotal = 0; //For one mod, The total Pep Num
if (!mod.Value.ModificationType.Contains("Common Variable") && !mod.Value.ModificationType.Contains("Common Fixed") && !mod.Value.LocationRestriction.Equals(ModLocationOnPeptideOrProtein.PepC) && !mod.Value.LocationRestriction.Equals(ModLocationOnPeptideOrProtein.NPep))
{
int tempIndexInProtein;
if (mod.Value.LocationRestriction.Equals("N-terminal."))
{
tempIndexInProtein = 1;
}
else if (mod.Value.LocationRestriction.Equals("Anywhere."))
{
tempIndexInProtein = pep.OneBasedStartResidueInProtein + mod.Key - 2;
}
else if (mod.Value.LocationRestriction.Equals("C-terminal."))
{
tempIndexInProtein = protein.Length;
}
else
{
// In case it's a peptide terminal mod, skip!
// we don't want this annotated in the protein's modifications
continue;
}
if (tempModIndex.Contains(tempIndexInProtein) && tempPepModValues[tempModIndex.IndexOf(tempIndexInProtein)] == mod.Value.IdWithMotif)
{
tempPepModTotals[tempModIndex.IndexOf(tempIndexInProtein)] += 1;
}
else
{
tempModIndex.Add(tempIndexInProtein);
foreach (var pept in proteinsWithPsmsWithLocalizedMods[protein])
{
if (tempIndexInProtein >= pept.OneBasedStartResidueInProtein - (tempIndexInProtein == 1 ? 1 : 0) && tempIndexInProtein <= pept.OneBasedEndResidueInProtein)
{
tempPepNumTotal += 1;
}
}
tempPepTotals.Add(tempPepNumTotal);
tempPepModValues.Add(mod.Value.IdWithMotif);
tempPepModTotals.Add(1);
}
}
}
}
for (int i = 0; i < tempPepModTotals.Count; i++)
{
string tempString = ("#aa" + tempModIndex[i].ToString() + "[" + tempPepModValues[i].ToString() + ",info:occupancy=" + ((double)tempPepModTotals[i] / (double)tempPepTotals[i]).ToString("F2") + "(" + tempPepModTotals[i].ToString() + "/" + tempPepTotals[i].ToString() + ")" + "];");
tempModStrings += tempString;
}
if (!string.IsNullOrEmpty(tempModStrings))
{
ModsInfo.Add(tempModStrings);
}
}
}
}
}