如何检索包含标题中任何字符串列表的所有fasta记录

时间:2016-11-02 15:00:56

标签: python string search biopython fasta

我想要一个可以从文件中提取所有fasta记录的脚本,该文件包含标题中的任何字符串列表。

所以,如果我在这样的文件中有一个列表:

2.A.1.13.5
3.A.1.208.23

这样的fasta文件:

>gnl|TC-DB|O60645|1.F.2.1.2 Exocyst complex component 3 OS=Homo sapiens GN=EXOC3 PE=1 SV=2
MQCEDSTSFFTMKETDREAVATAVQRVAGMLQRPDQLDKVEQYRRREARKKASVEARLKA
>gnl|TC-DB|O60669|2.A.1.13.5 Monocarboxylate transporter 2 - Homo sapiens (Human).
MPPMPSAPPVHPPPDGGWGWIVVGAAFISIGFSYAFPKAVTVFFKEIQQIFHTTYSEIAW
>gnl|TC-DB|O60683|3.A.20.1.1 Peroxisome biogenesis factor 10 OS=Homo sapiens GN=PEX10 PE=1 SV=1
MAPAAASPPEVIRAAQKDEYYRGGLRSAAGGALHSLAGARKWLEWRKEVELLSDVAYFGL
>gnl|TC-DB|O60684|1.I.1.1.3 Importin subunit alpha-7 OS=Homo sapiens GN=KPNA6 PE=1 SV=1
METMASPGKDNYRMKSYKNNALNPEEMRRRREEEGIQLRKQKREQQLFKRRNVELINEEA
>gnl|TC-DB|O60706|3.A.1.208.23 ATP-binding cassette sub-family C member 9 OS=Homo sapiens GN=ABCC9 PE=1 SV=2
MSLSFCGNNISSYNINDGVLQNSCFVDALNLVPHVFLLFITFPILFIGWGSQSSKVQIHH
>gnl|TC-DB|O60721|3.A.1.208.23 Sodium/potassium/calcium exchanger 1 OS=Homo sapiens GN=SLC24A1 PE=1 SV=1
MGKLIRMGPQERWLLRTKRLHWSRLLFLLGMLIIGSTYQHLRRPRGLSSLWAAVSSHQPI
>gnl|TC-DB|O60779|2.A.1.13.5 Thiamine transporter 1 (THTR-1) (ThTr1) (Thiamine carrier 1) (TC1) - Homo sapiens (Human).
MDVPGPVSRRAAAAAATVLLRTARVRRECWFLPTALLCAYGFFASLRPSEPFLTPYLLGP

然后脚本将打印第2,第5,第6和第7条记录,如下所示:

>gnl|TC-DB|O60669|2.A.1.13.5 Monocarboxylate transporter 2 - Homo sapiens (Human).
MPPMPSAPPVHPPPDGGWGWIVVGAAFISIGFSYAFPKAVTVFFKEIQQIFHTTYSEIAW
>gnl|TC-DB|O60706|3.A.1.208.23 ATP-binding cassette sub-family C member 9 OS=Homo sapiens GN=ABCC9 PE=1 SV=2
MSLSFCGNNISSYNINDGVLQNSCFVDALNLVPHVFLLFITFPILFIGWGSQSSKVQIHH
>gnl|TC-DB|O60721|3.A.1.208.23 Sodium/potassium/calcium exchanger 1 OS=Homo sapiens GN=SLC24A1 PE=1 SV=1
MGKLIRMGPQERWLLRTKRLHWSRLLFLLGMLIIGSTYQHLRRPRGLSSLWAAVSSHQPI
>gnl|TC-DB|O60779|2.A.1.13.5 Thiamine transporter 1 (THTR-1) (ThTr1) (Thiamine carrier 1) (TC1) - Homo sapiens (Human).
MDVPGPVSRRAAAAAATVLLRTARVRRECWFLPTALLCAYGFFASLRPSEPFLTPYLLGP

这是我采取的那种方法,但我可能会在数英里之外,因为我不知道自己在做什么。我被告知BioPython很适合处理fasta格式文件,但仍然试图掌握它。

from Bio import SeqIO
import sys

headers = []

search_list = open(sys.argv[1])
for line in search_list:
    headers.append(line.rstrip())
search_list.close()

print search_list

for seq_record in SeqIO.parse(sys.argv[2], "fasta"):
    #print seq_record
    for a in headers:
        head = str(a)
        if head in seq_record:
            print seq_record

提前干杯以获得任何帮助!

2 个答案:

答案 0 :(得分:1)

您的代码几乎包含所有内容。您只需要检查标题是否在description中,然后打印SeqRecord元素就可以了。

from Bio import SeqIO
import sys

headers = list()

with open(sys.argv[1], 'r') as search_list:
    for line in search_list:
        headers.append(line.rstrip())

for seq_record in SeqIO.parse(sys.argv[2], "fasta"):
    for head in headers:
        if head in seq_record.description:
            print(seq_record.format('fasta'))
            break

小注意:我在第一个找到的元素后添加了break语句,如果找到两个标题,它会打印两次。

答案 1 :(得分:0)

import re
list_items = '|'.join(list(open('list.txt').read().split('\n')))

with open('fasta.txt') as f:
    for line in f.read().split('\n'):
        if re.search(list_items, line ):
            print line

输出:

  

gnl | TC-DB | O60669 | 2.A.1.13.5单羧酸转运蛋白2-Homo sapiens(人)。   gnl | TC-DB | O60706 | 3.A.1.208.23 ATP结合盒亚家族C成员9 OS = Homo sapiens GN = ABCC9 PE = 1 SV = 2   gnl | TC-DB | O60721 | 3.A.1.208.23钠/钾/钙交换体1 OS = Homo sapiens GN = SLC24A1 PE = 1 SV = 1   gnl | TC-DB | O60779 | 2.A.1.13.5硫胺转运蛋白1(THTR-1)(ThTr1)(硫胺素载体1)(TC1) - 智人(人)。