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Example:

NM_000525.3(KCNJ11):c. 67A>G ( p. Lys23Glu) AND Permanent neonatal diabetes mellitus

Does "p" stand for "polymorphism"?

What does the letter "c" stand for?

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    $\begingroup$ I think c refers to cDNA and p refers to protein. Similarly there is g which most likely refers to genomic DNA. $\endgroup$ – WYSIWYG Jun 28 '16 at 13:39
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    $\begingroup$ You could check the whole HGVS guideline varnomen.hgvs.org for explanations (also @WYSIWYG is right). $\endgroup$ – Maxim Kuleshov Jun 28 '16 at 15:09
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According to the HGVS guidelines, a letter prefix should be used to indicate the reference sequence used. Accepted prefixes are:

  • “g.” for a genomic reference sequence
  • “m.” for a mitochondrial reference sequence
  • “c.” for a coding DNA reference sequence
  • “n.” for a non-coding DNA reference sequence
  • “r.” for an RNA reference sequence (transcript)
  • “p.” for a protein reference sequence
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