ABCA5 and gingival disorder: Whereas the chromosome rearrangement and clinical presentation of Case 1 currently appears unique in the literature, a TAD-based analysis of Case 2, in which the proband is affected by localised hypertrichosis (HTC) and gingival hyperplasia (GH) and harbours a duplication of 17q24.3, is more broadly instructive for disease mechanism at the HTC3 locus.