포유동물 세포에서 퓨린 디옥시리보뉴클레오시드의 인산화 작용은 주로 세포질 디옥시시티딘 키나아제 및 미토콘드리아 디옥시구아노신 키나아제라는 두 가지 디옥시리보뉴클레오시드 키나제에 의해 매개된다.이 유전자에 의해 암호화된 단백질은 미토콘드리아 매트릭스에서 퓨린 디옥시리보뉴클레오시드의 인산화 작용을 담당한다.또한 이 단백질은 림프증식장애 치료에 이용되는 몇 가지 퓨린디옥시리보뉴클레오시드 유사체를 인산화하며, 이 인산화효과는 이들 유사체의 유효성에 매우 중요하다.다른 단백질 [5]아이소폼을 코드하는 대체 스플라이스 변이가 이 유전자에 대해 설명되었다.
임상
이 유전자의 돌연변이는 유전되는 미토콘드리아 DNA 고갈 증후군, 신생아 간 기능 상실, 안진 및 저혈압과 관련이 있다.
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