public BaseCalledAllele()
{
Filters = new List <FilterType>();
TotalCoverageByDirection = new int[Constants.NumDirectionTypes];
StrandBiasResults = new StrandBiasResults();
SupportByDirection = new int[Constants.NumDirectionTypes];
}
/// <summary>
/// Assign a strandbias-score to a SNP.
/// (using only forward and reverse SNP counts.)
/// </summary>
private static StrandBiasResults CalculateStrandBiasResults(int[] coverageByStrandDirection,
int[] supportByStrandDirection,
int qNoise, double acceptanceCriteria, StrandBiasModel strandBiasModel)
{
var forwardSupport = supportByStrandDirection[(int)DirectionType.Forward];
var forwardCoverage = coverageByStrandDirection[(int)DirectionType.Forward];
var reverseSupport = supportByStrandDirection[(int)DirectionType.Reverse];
var reverseCoverage = coverageByStrandDirection[(int)DirectionType.Reverse];
var stitchedSupport = supportByStrandDirection[(int)DirectionType.Stitched];
var stitchedCoverage = coverageByStrandDirection[(int)DirectionType.Stitched];
var errorRate = Math.Pow(10, -1 * qNoise / 10f);
var overallStats = CreateStats(forwardSupport + reverseSupport + stitchedSupport,
forwardCoverage + reverseCoverage + stitchedCoverage, errorRate, errorRate, strandBiasModel);
var forwardStats = CreateStats(forwardSupport + stitchedSupport / 2,
forwardCoverage + stitchedCoverage / 2,
errorRate, errorRate, strandBiasModel);
var reverseStats = CreateStats(reverseSupport + stitchedSupport / 2,
reverseCoverage + stitchedCoverage / 2,
errorRate, errorRate, strandBiasModel);
var results = new StrandBiasResults
{
ForwardStats = forwardStats,
ReverseStats = reverseStats,
OverallStats = overallStats
};
results.StitchedStats = CreateStats(stitchedSupport, stitchedCoverage, errorRate, errorRate,
strandBiasModel);
var biasResults = AssignBiasScore(overallStats, forwardStats, reverseStats);
results.BiasScore = biasResults[0];
results.GATKBiasScore = biasResults[1];
results.CovPresentOnBothStrands = ((forwardStats.Coverage > 0) && (reverseStats.Coverage > 0));
results.VarPresentOnBothStrands = ((forwardStats.Support > 0) && (reverseStats.Support > 0));
//not really fair to call it biased if coverage is in one direction..
//its ambiguous if variant is found in only one direction.
if (!results.CovPresentOnBothStrands)
{
results.BiasScore = 0;
results.GATKBiasScore = double.NegativeInfinity;
}
var testResults = MathOperations.GetTValue(forwardStats.Frequency, reverseStats.Frequency,
forwardStats.Coverage,
reverseStats.Coverage, acceptanceCriteria);
results.TestScore = testResults[0];
results.TestAcceptable = ValueAcceptable(acceptanceCriteria, testResults[0], testResults[1]);
results.BiasAcceptable = (results.BiasScore < acceptanceCriteria);
return(results);
}
public CalledAllele()
{
Filters = new List <FilterType>();
EstimatedCoverageByDirection = new int[Constants.NumDirectionTypes];
StrandBiasResults = new StrandBiasResults();
SupportByDirection = new int[Constants.NumDirectionTypes];
ReadCollapsedCounts = new int[Constants.NumReadCollapsedTypes];
Genotype = Genotype.HomozygousRef;
Type = AlleleCategory.Reference;
}
public static CalledAllele DeepCopy(CalledAllele originalAllele)
{
if (originalAllele == null)
{
return(null);
}
var allele = new CalledAllele
{
Chromosome = originalAllele.Chromosome,
Coordinate = originalAllele.Coordinate,
Reference = originalAllele.Reference,
Alternate = originalAllele.Alternate,
Genotype = originalAllele.Genotype,
GenotypeQscore = originalAllele.GenotypeQscore,
VariantQscore = originalAllele.VariantQscore,
FractionNoCalls = originalAllele.FractionNoCalls,
NoiseLevelApplied = originalAllele.NoiseLevelApplied,
TotalCoverage = originalAllele.TotalCoverage,
AlleleSupport = originalAllele.AlleleSupport,
ReferenceSupport = originalAllele.ReferenceSupport,
Type = originalAllele.Type,
SupportByDirection = new int[Constants.NumDirectionTypes],
EstimatedCoverageByDirection = new int[Constants.NumDirectionTypes],
ReadCollapsedCounts = new int[Constants.NumReadCollapsedTypes],
StrandBiasResults = StrandBiasResults.DeepCopy(originalAllele.StrandBiasResults),
Filters = new List <FilterType>()
};
foreach (var filter in originalAllele.Filters)
{
allele.Filters.Add(filter);
}
for (int i = 0; i < Constants.NumDirectionTypes; i++)
{
allele.SupportByDirection[i] = originalAllele.SupportByDirection[i];
allele.EstimatedCoverageByDirection[i] = originalAllele.EstimatedCoverageByDirection[i];
allele.ReadCollapsedCounts[i] = originalAllele.ReadCollapsedCounts[i];
}
return(allele);
}
public static string StatsToString(StrandBiasResults stat)
{
var delimiter = "\t";
StringBuilder builder = new StringBuilder();
string[] statsData = new string[3 * 5];
StringHelper(stat.OverallStats, statsData, 0, 3, delimiter);
StringHelper(stat.ForwardStats, statsData, 1, 3, delimiter);
StringHelper(stat.ReverseStats, statsData, 2, 3, delimiter);
foreach (string t in statsData)
{
builder.Append(t);
}
//raw data
//for (int i = 0; i < Constants.NumDirectionTypes; i++)
// builder.Append(stat.CoverageByStrandDirection[i] + "\t");
builder.Append(stat.ForwardStats.Coverage + delimiter);
builder.Append(stat.ReverseStats.Coverage + delimiter);
builder.Append(stat.StitchedStats.Coverage + delimiter);
//for (int i = 0; i < Constants.NumDirectionTypes; i++)
// builder.Append(SupportByStrandDirection[i] + "\t");
builder.Append(stat.ForwardStats.Support + delimiter);
builder.Append(stat.ReverseStats.Support + delimiter);
builder.Append(stat.StitchedStats.Support + delimiter);
//results
builder.Append(stat.BiasScore + delimiter);
builder.Append(stat.BiasAcceptable + delimiter);
builder.Append(stat.VarPresentOnBothStrands + delimiter);
builder.Append(stat.CovPresentOnBothStrands + delimiter);
return(builder.ToString());
}
public static StrandBiasResults DeepCopy(StrandBiasResults originalSBresults)
{
if (originalSBresults == null)
{
return(null);
}
var sb = new StrandBiasResults()
{
BiasAcceptable = originalSBresults.BiasAcceptable,
BiasScore = originalSBresults.BiasScore,
GATKBiasScore = originalSBresults.GATKBiasScore,
VarPresentOnBothStrands = originalSBresults.VarPresentOnBothStrands,
CovPresentOnBothStrands = originalSBresults.CovPresentOnBothStrands,
TestAcceptable = originalSBresults.TestAcceptable,
TestScore = originalSBresults.TestScore,
ForwardStats = StrandBiasStats.DeepCopy(originalSBresults.ForwardStats),
OverallStats = StrandBiasStats.DeepCopy(originalSBresults.OverallStats),
ReverseStats = StrandBiasStats.DeepCopy(originalSBresults.ReverseStats),
StitchedStats = StrandBiasStats.DeepCopy(originalSBresults.StitchedStats),
};
return(sb);
}
public static CalledAllele ConvertUnpackedVariant(VcfVariant v)
{
if (v == null)
{
return(null);
}
if (v.VariantAlleles.Count() > 1)
{
throw new ApplicationException("This method does not yet handle crushed vcf format.");
}
var genotypeQscore = 0;
var referenceSupport = 0;
var altSupport = 0;
var genotypeString = "";
var isRef = ((v.VariantAlleles.Count() == 1) && v.VariantAlleles[0] == ".");
var totalCoverage = Int32.Parse(v.InfoFields["DP"]);
var variantQuality = v.Quality;
var numAlts = 1;
var noiseLevel = 1;
var fractionNocalls = 0f;
var strandBiasInGATKScaleCoords = -100f;
if (v.Genotypes.Count > 0)
{
if (v.Genotypes[0].ContainsKey("GQ"))
{
genotypeQscore = Int32.Parse(v.Genotypes[0]["GQ"]);
}
else if (v.Genotypes[0].ContainsKey("GQX"))
{
genotypeQscore = Int32.Parse(v.Genotypes[0]["GQX"]);
}
genotypeString = v.Genotypes[0]["GT"];
if (v.Genotypes[0].ContainsKey("NL"))
{
noiseLevel = Int32.Parse(v.Genotypes[0]["NL"]);
}
if (v.Genotypes[0].ContainsKey("NC"))
{
fractionNocalls = float.Parse(v.Genotypes[0]["NC"]);
}
if (v.Genotypes[0].ContainsKey("SB"))
{
strandBiasInGATKScaleCoords = float.Parse(v.Genotypes[0]["SB"]);
}
var ADstring = new string[] { "0", "0" };
if (v.Genotypes[0].ContainsKey("AD"))
{
ADstring = v.Genotypes[0]["AD"].Split(',');
}
var VFstring = new string[] { "0", "0" };
if (v.Genotypes[0].ContainsKey("VF"))
{
VFstring = v.Genotypes[0]["VF"].Split(',');
}
referenceSupport = int.Parse(ADstring[0]);
altSupport = isRef ? 0 : int.Parse(ADstring[1]);
if (isRef)
{
numAlts = 0;
}
else
{
numAlts = VFstring.Length; //note this, method should never get a value here >1. yet.
}
}
var alleleType = Map(v).Type;
if (isRef)
{
alleleType = AlleleCategory.Reference;
}
var strandBiasResults = new StrandBiasResults();
strandBiasResults.GATKBiasScore = strandBiasInGATKScaleCoords;
var allele = new CalledAllele()
{
Chromosome = v.ReferenceName,
Coordinate = v.ReferencePosition,
Reference = v.ReferenceAllele,
Alternate = v.VariantAlleles[0],
TotalCoverage = totalCoverage,
AlleleSupport = isRef ? referenceSupport : altSupport,
ReferenceSupport = referenceSupport,
VariantQscore = (int)variantQuality,
GenotypeQscore = genotypeQscore,
Type = alleleType,
Genotype = MapGTString(genotypeString, numAlts),
Filters = MapFilterString(v.Filters),
NoiseLevelApplied = noiseLevel,
StrandBiasResults = strandBiasResults,
FractionNoCalls = fractionNocalls
};
return(allele);
}
