Abstract
Mosaicism results from postzygotic alterations during embryogenesis leading to genetically distinct populations of cells within individuals and has been historically recognized by phenotypes with visible, often patterned manifestations. Before the advent of molecular profiling assays and high-throughput sequencing, it was challenging to study mosaicism in human disease; however, the study of mosaic disorders has recently revealed unexpected and novel pathways for disease pathogenesis. In this paper, we will review the techniques for discovery of disease-causing alleles using Proteus syndrome; phakomatosis pigmentokeratotica; linear porokeratosis; and vacuoles, E1 enzyme, X-linked, autoinflammatory somatic syndrome as models. These tools represent powerful approaches for dissecting the genetic basis for human disorders.
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