TCF20 and neurodevelopmental disorder: WES and Sanger sequencing analysis revealed a previously unreported single base pair heterozygous deletion, NM_001378418.1:c.4737del; NP_001365347.1:p.Lys1579Asnfs*36 (GRCh38/hg38), in the proband (II:1, Fig. 1) and her brother (II:2) located within the region encoding the N2 domain of the TCF20 protein amidst a stretch of four other previously reported neurodevelopmental disorder-associated variants (spanning c.4737 to c.4786; Fig. 3), reported as pathogenic in ClinVar (NCBI) (accession number VCV002571818.3).