Unbalanced parental translocation in 10-15% patients [MISCELLANEOUS] De novo deletion in 85% patients [MISCELLANEOUS] Contiguous gene syndrome caused by deletion of 560 kb to 40 Mb on chromosome 5p15.2 [MOLECULAR BASIS] Incidence 1/50,000 newborns [MISCELLANEOUS] Paternal origin in 80-90% patients [MISCELLANEOUS]
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