Comprehensive database of academic research and authoritative scholarly materials on your topic. Use this to find both background information on your genetic disorder, as well as studies related to the disease, therapies, and statistics around prevalence. 
Online Mendelian Inheritance in Man is a database of human genes and genetic disorders compiled to support research and education and the practice of clinical genetics. The topic reviews in OMIM are written and edited at Johns Hopkins University with input from scientists and physicians around the world. OMIM can be searched by gene name or disease name or symptoms.

Includes various tools that anyone can use to investigate genetic disorders, chromosomes, genome maps, genes, sequence data, genetic variants, and molecular structures. Produced by the U.S. Dept. of Energy Biological and Environmental Research program.