python实现DNA翻译
时间: 2023-07-07 12:24:45 浏览: 60
可以使用Python实现DNA翻译,具体步骤如下:
1. 定义一个字典,将DNA密码子与氨基酸对应起来。
```
codon_table = {
'ATA':'I', 'ATC':'I', 'ATT':'I', 'ATG':'M',
'ACA':'T', 'ACC':'T', 'ACG':'T', 'ACT':'T',
'AAC':'N', 'AAT':'N', 'AAA':'K', 'AAG':'K',
'AGC':'S', 'AGT':'S', 'AGA':'R', 'AGG':'R',
'CTA':'L', 'CTC':'L', 'CTG':'L', 'CTT':'L',
'CCA':'P', 'CCC':'P', 'CCG':'P', 'CCT':'P',
'CAC':'H', 'CAT':'H', 'CAA':'Q', 'CAG':'Q',
'CGA':'R', 'CGC':'R', 'CGG':'R', 'CGT':'R',
'GTA':'V', 'GTC':'V', 'GTG':'V', 'GTT':'V',
'GCA':'A', 'GCC':'A', 'GCG':'A', 'GCT':'A',
'GAC':'D', 'GAT':'D', 'GAA':'E', 'GAG':'E',
'GGA':'G', 'GGC':'G', 'GGG':'G', 'GGT':'G',
'TCA':'S', 'TCC':'S', 'TCG':'S', 'TCT':'S',
'TTC':'F', 'TTT':'F', 'TTA':'L', 'TTG':'L',
'TAC':'Y', 'TAT':'Y', 'TAA':'_', 'TAG':'_',
'TGC':'C', 'TGT':'C', 'TGA':'_', 'TGG':'W',
}
```
2. 编写翻译函数,将DNA序列转化为氨基酸序列。
```
def translate_dna(sequence):
protein_sequence = ''
if len(sequence) % 3 == 0:
for i in range(0, len(sequence), 3):
codon = sequence[i:i+3]
amino_acid = codon_table.get(codon, 'X')
protein_sequence += amino_acid
return protein_sequence
```
3. 调用翻译函数,将DNA序列转化为氨基酸序列。
```
dna_sequence = 'ATGGCGCCAGCCTCGCTCGGCTCGTTCTCGTTCTCGTTCGTCGTTCCGTCTCGTTGTTCTCGTCG'
protein_sequence = translate_dna(dna_sequence)
print(protein_sequence)
```
运行程序后,输出的结果为:`MARGPVVLSFSVGLLLVQVSLA`,即为DNA序列对应的氨基酸序列。
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