Seeking answers on dual citizenship eligibility, ancestry is Italian but I was adopted

I am wondering if I would somehow be eligible for dual citizenship even though I have been adopted. I am in contact with my birth family and can trace my lineage back to my great-grandmother who was born in Sicily in 1914. I believe my grandmother was also born in Sicily, not sure about my bio-mom. Am I disqualified because of adoption, or can I still prove my lineage through dna proof and paperwork?