摘要 : The 16p11.2 duplication is a well-known cause of developmental delay and autism, but there are only 2 previously reported cases of 16p11.2 triplication. Both of the previously reported cases exhibited tandem triplication on a 16p1... 展开 The 16p11.2 duplication is a well-known cause of developmental delay and autism, but there are only 2 previously reported cases of 16p11.2 triplication. Both of the previously reported cases exhibited tandem triplication on a 16p11.2 duplication inherited from 1 parent. We report fraternal twins presenting with developmental delay and 16p11.2 triplication resulting from inheritance of a 16p11.2 duplicated homolog from each parent. This report also reviews the overlapping features in previously published cases of 16p11.2 triplication, and possible implications are discussed. 收起