Participants may be recruited from Boston Children's Hospital (BCH) or from off-site collaborators/healthcare providers who determine a participant as eligible. Participants may also contact the lab directly after hearing about the research through other individuals, recruitment materials, or the study's website (www.childrenshospital.org/mantoncenter). After consenting to participation, individuals with rare disorders with a suspected, but unknown/poorly understood genetic basis, and their family members are asked to participate in the study by providing 1) relevant medical information/records and family history 2) a blood/saliva/DNA/RNA sample, and 3) a preexisting tissue samples (including preexisting prenatal samples) that is no longer needed for clinical care (if available) or future tissue sample specifically for research purposes.