我有一个fastq的读取文件,比如“reads.fastq”。我想将sequnces与保存为fasta文件ref.faa的字符串对齐。我正在使用以下代码
reads_array = []
for x in Bio.SeqIO.parse("reads.fastq","fastq"):
reads_array.append(x)
for x in Bio.SeqIO.parse("ref.faa","fasta"):
refseq = x
result = open("alignments_G10_final","w")
aligned_reads = []
for x in reads_array:
alignments =pairwise2.align.globalms(str(refseq.seq).upper(),str(x.seq),2,-1,-5,-0.05)
for a in alignments:
result.write(format_alignment(*a))
aligned_reads.append(x)
但我想报告每次读取的最佳对齐方式。如何从[2]中的分数中选择这种对齐方式。我想选择具有最高值a [2]的对齐方式
您可以根据[2]对对齐进行排序:
for x in reads_array:
alignments =pairwise2.align.globalms(str(refseq.seq).upper(),str(x.seq),2,-1,-5,-0.05)
sorted_alignments = sorted(alignments, key=operator.itemgetter(2))
result.write(format_alignment(*sorted_alignments[0]))
aligned_reads.append(x)
我知道这是一个老问题,但对于仍在寻找正确答案的人,请在你的对齐方法中添加one_alignment_only=True
参数:
alignments =pairwise2.align.globalms(str(refseq.seq).upper(),
str(x.seq),
2,-1,-5,-0.05,
one_alignment_only=True)
我不得不在文档中进行一些挖掘以找到它,但这会给出最佳分数。