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to RNA Transcription in the Clojure Track

Published at Mar 06 2019 · 0 comments
Test suite

Given a DNA strand, return its RNA complement (per RNA transcription).

Both DNA and RNA strands are a sequence of nucleotides.

The four nucleotides found in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T).

The four nucleotides found in RNA are adenine (A), cytosine (C), guanine (G) and uracil (U).

Given a DNA strand, its transcribed RNA strand is formed by replacing each nucleotide with its complement:

  • G -> C
  • C -> G
  • T -> A
  • A -> U


Hyperphysics http://hyperphysics.phy-astr.gsu.edu/hbase/Organic/transcription.html

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


(ns rna-transcription-test
  (:require [clojure.test :refer [deftest is]]

(deftest transcribes-cytosine-to-guanine
  (is (= "G" (rna-transcription/to-rna "C"))))

(deftest transcribes-guanine-to-cytosine
  (is (= "C" (rna-transcription/to-rna "G"))))

(deftest transcribes-adenine-to-uracil
  (is (= "U" (rna-transcription/to-rna "A"))))

(deftest it-transcribes-thymine-to-adenine
  (is (= "A" (rna-transcription/to-rna "T"))))

(deftest it-transcribes-all-nucleotides
  (is (= "UGCACCAGAAUU" (rna-transcription/to-rna "ACGTGGTCTTAA"))))

(deftest it-validates-dna-strands
  (is (thrown? AssertionError (rna-transcription/to-rna "XCGFGGTDTTAA"))))
(ns rna-transcription)

(def transcription-map {
    \C \G
    \G \C
    \A \U
    \T \A})

; I'm a bit surprised there isn't something in the core library
; taking [x pred] that results in (do (assert (pred x)) x).

(defn to-rna [dna]
    (->> dna
            (fn [nuc]
                (doto (transcription-map nuc)
        (apply str)))

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