Hi Monks.

I am unable to determine why the following *experimental* code is only appending the one letter amino acid to the end of the initial DNA string as opposed to displaying only the amino acid in question. The program should display only an 'L' and not 'TTAL'. Note: This is not a homework assignment. 

use strict;
use warnings;
use feature qw(postderef);
no warnings qw(experimental::postderef);
use feature qw(say);

my $dna = 'TTA';
my @proteinString;
my $codon;

for(my $i=0; $i < (length($dna) - 2) ; $i += 3) {
    $codon = substr($dna,$i,3);
    push @proteinString, $codon .= codonToAminoAcid($codon);
}

my $proteinString = \@proteinString;

for my $element ( $proteinString->@* )
{
    say $element;
}

sub codonToAminoAcid {
     my($codon) = @_;

     if    ( $codon =~ /GC./i)        { return 'A' }    
     elsif ( $codon =~ /TG[TC]/i)     { return 'C' }    
     elsif ( $codon =~ /GA[TC]/i)     { return 'D' }    
     elsif ( $codon =~ /GA[AG]/i)     { return 'E' }    
     elsif ( $codon =~ /TT[TC]/i)     { return 'F' }    
     elsif ( $codon =~ /GG./i)        { return 'G' }    
     elsif ( $codon =~ /CA[TC]/i)     { return 'H' }    
     elsif ( $codon =~ /AT[TCA]/i)    { return 'I' }    
     elsif ( $codon =~ /AA[AG]/i)     { return 'K' }    
     elsif ( $codon =~ /TT[AG]|CT./i) { return 'L' }    
     elsif ( $codon =~ /ATG/i)        { return 'M' }    
     elsif ( $codon =~ /AA[TC]/i)     { return 'N' }    
     elsif ( $codon =~ /CC./i)        { return 'P' }    
     elsif ( $codon =~ /CA[AG]/i)     { return 'Q' }    
     elsif ( $codon =~ /CG.|AG[AG]/i) { return 'R' }    
     elsif ( $codon =~ /TC.|AG[TC]/i) { return 'S' }    
     elsif ( $codon =~ /AC./i)        { return 'T' }    
     elsif ( $codon =~ /GT./i)        { return 'V' }    
     elsif ( $codon =~ /TGG/i)        { return 'W' }    
     elsif ( $codon =~ /TA[TC]/i)     { return 'Y' }    
     elsif ( $codon =~ /TA[AG]|TGA/i) { return '_' }    
     else {
         print "Unrecognized codon: \"$codon\"!\n";
         exit;
     }
 }

[download]


Thanks.

In reply to Displayng the correct codon in a DNA string. by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.