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Problema 1 del folleto "A The first look at the Code of Life" de Cleopatra Kozlowski http://emblog.embl.de/ells/teachingbase/code-of-life-2/. Se trata de encontrar secuencias de péptidos en una secuencia de ADN dada, para ello este pequeño programa genera una expresión regular basada en la secuencia de aminoácidos para encontrar la posición en l…
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# coding: utf-8 | |
import re | |
def secuencia_degenerada(sequencia): | |
seq = [] | |
aa_degenerados = { | |
'A': ['GC.'], | |
'C': ['TG[CT]'], | |
'D': ['GA[CT]'], | |
'E': ['GA[AG]'], | |
'F': ['TT[CT]'], | |
'G': ['GG.'], | |
'H': ['CA[CT]'], | |
'I': ['AT[CAT]'], | |
'K': ['AA[AG]'], | |
'L': ['[CT]T.'], | |
'M': ['ATG'], | |
'N': ['AA[CT]'], | |
'P': ['CC.'], | |
'Q': ['CA[AG]'], | |
'R': ['[AC]G.'], | |
'S': ['[AT][CG].'], | |
'T': ['AC.'], | |
'V': ['GT.'], | |
'W': ['TGG'], | |
'Y': ['TA[CT]'], | |
'*': ['T[AG][AG]'] | |
} | |
for i in range(len(sequencia)): | |
seq.append(aa_degenerados[sequencia[i]]) | |
regexp = ''.join(str(e) for e in seq) | |
return regexp.replace("['", "").replace("']", "") | |
def encuentra_motivo(regexp, DNA_sequence): | |
return re.search(regexp, DNA_sequence).group() | |
def main(): | |
DNA_sequence = "TGGTCCTGCAGTCCTCTCCTGGCGCCCCGGGGGCGAGCGGATGTCGATTCTCGTGGAAAGATAGTCCCGCTGCCTGCGGGCGGAGGGACCGTGCTGACCAAGATGTACCCGCGCGGCAACCACTGGGCGGTGGGGCACTTAATGGGGAAAAAGAGCACAGGGGAGTCTTCTTCTGTATGTTCTGAGAGAGGGAGCCTGAAGCAGCAGCTGAGAGATGTGTCGAACGTGAAGTACATCAGGTGGGAAGAAGCTGCAAGGAATTTGCTGGGTCTCATAGAAGCTAAAGGAGAACAGAAACCACCAGCCACCTCAACCCAAGATGTCGATTCTACTTTATTAAGCCCTGGGCAATCAGCAGCCTTCGTGGGATATGTCAGAGGATAGCAGCCAACTGAATAGC" | |
#Met Ser Ile Leu Val Glu Arg Stop | |
peptido_1 = "MSILVER*" | |
#Met Cys Arg Thr Stop | |
peptido_2 = "MCRT*" | |
#Met Ser Ile Leu Leu Tyr Stop | |
peptido_3 = "MSILLY*" | |
peptidos = [peptido_1, peptido_2, peptido_3] | |
for peptido in peptidos: | |
regexp = secuencia_degenerada(peptido) | |
match = encuentra_motivo(regexp, DNA_sequence) | |
print(peptido + "\n" + str(DNA_sequence.find(match) + 1 ) + " " + match + " " + str((DNA_sequence.find(match) + len(match))) + "\n") | |
if __name__ == '__main__': | |
main() |
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