Ataxia-Telangiectasia-Like Disorder 2, is also known as pcna-related progressive neurodegenerative photosensitivity syndrome, and has symptoms including ataxia and photophobia. An important gene associated with Ataxia-Telangiectasia-Like Disorder 2 is PCNA (Proliferating Cell Nuclear Antigen). Affiliated tissues include skin, and related phenotypes are hearing impairment and global developmental delay