前言
问题
思路
1. 预处理
2. 将pretreatment.txt作为输入文件,
3.去重+归并排序
4.开始比对,gap=50
5.将new_result.txt作为输出文件,生成结果
6. 完整代码
前言RepeatMasker是一个通过已有数据库预测重复序列的软件,可以筛选DNA序列中的散在重复序列和低复杂序列,是重复序列注释的重要软件。
问题我们想对RepeatMasker预测的结果文件进行重复序列的合并,也就是去除染色体之间的overlap区域同时将基因间距小于50个bp的也同样视为overlap,我们应该如何用python处理并生成新的预测结果?
思路首先需要对文件进行预处理提取出需要处理的列,'//'可以忽略
对相同染色体序列按照升序进行归并排序
分别取相应染色体按照滑动窗口的思路进行双指针比对,注意gap=50
1. 预处理我们这里只需要结果文件的前三列,可以使用awk命令获取
awk '{for(i = 1; i <= 3; i++)
printf("%s ", $i);
printf("\n")}' result.txt > pretreatment.txt
#result.txt为结果文件,pretreatment.txt为预处理结果文件
2. 将pretreatment.txt作为输入文件,
with open ('pretreatment.txt','r')as f:
for i in f.readlines():
if i.strip() == '//':
continue
c = i.strip().split('\t')
b.append(c[0])
a.append((c[0],int(c[1]),int(c[2])))
print ("全部染色体数量: "+str(len(a)))
3.去重+归并排序
c = [i for i in b_set if b.count(i) == 1]
for i in a:
if i[0] not in c:
continue
a.remove(i)
result.append((i[0],int(i[1]),int(i[2])))
print ("去重后染色体数量: "+str(len(a)))
a.sort(key = lambda x : (x[0], x[1], x[2]))
#按照第一列,第二列,第三列分别排降升序
4.开始比对,gap=50
q = ''
start = 0
end = 0
tem1 = []
tem2 = []
gap = 50
for i in a:
if i[0] != q:
if tem1:
if tem1 not in tem2:
tem2.append(tem1)
tem1 = []
q = I[0]
start = int(i[1])
end = int(i[2])
continue
if int(i[1]) < end or int(i[1]) - end < gap:
if int(i[2]) > end:
end = int(i[2])
continue
else:
continue
tem1.append([q,start,end])
start = int(i[1])
end = int(i[2])
5.将new_result.txt作为输出文件,生成结果
with open ('new_result.txt','w')as f:
for i in tem2:
for o in I:
print (o[0],o[1],o[2],file=f)
for i in result:
print (i[0],i[1],i[2],file=f)
6. 完整代码
a = []
b = []
with open ('pretreatment.txt','r')as f:
for i in f.readlines():
if i.strip() == '//':
continue
c = i.strip().split('\t')
b.append(c[0])
a.append((c[0],int(c[1]),int(c[2])))
print ("全部染色体数量: "+str(len(a)))
b_set = set(b)
result = []
c = [i for i in b_set if b.count(i) == 1]
for i in a:
if i[0] not in c:
continue
a.remove(i)
result.append((i[0],int(i[1]),int(i[2])))
print ("去重后染色体数量: "+str(len(a)))
a.sort(key = lambda x : (x[0], x[1], x[2]))
q = ''
start = 0
end = 0
tem1 = []
tem2 = []
gap = 50
for i in a:
if i[0] != q:
if tem1:
if tem1 not in tem2:
tem2.append(tem1)
tem1 = []
q = I[0]
start = int(i[1])
end = int(i[2])
continue
if int(i[1]) < end or int(i[1]) - end < gap:
if int(i[2]) > end:
end = int(i[2])
continue
else:
continue
tem1.append([q,start,end])
start = int(i[1])
end = int(i[2])
with open ('new_result.txt','w')as f:
for i in tem2:
for o in I:
print (o[0],o[1],o[2],file=f)
for i in result:
print (i[0],i[1],i[2],file=f)
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