1. Massari ME, Murre C. Helix-loop-helix proteins: regulators of transcription in eucaryotic organisms. Mol Cell Biol. 2000 Jan;20(2):429–40.
2. Dennis DJ, Han S, Schuurmans C. bHLH transcription factors in neural development, disease, and reprogramming. Brain Res. 2019 Feb 15;1705:48–65.
3. Pitt D, Hopkins I. A syndrome of mental retardation, wide mouth and intermittent overbreathing. Aust Paediatr J. 1978 Sep;14(3):182–4.
4. de Winter CF, Baas M, Bijlsma EK, van Heukelingen J, Routledge S, Hennekam RC. Phenotype and natural history in 101 individuals with Pitt-Hopkins syndrome through an internet questionnaire system. Orphanet J Rare Dis. 2016 Apr 12;11:37.
5. Rosenfeld JA, Leppig K, Ballif BC, Thiese H, Erdie-Lalena C, Bawle E, et al. Genotype-phenotype analysis of TCF4 mutations causing Pitt-Hopkins syndrome shows increased seizure activity with missense mutations. Genet Med. 2009 Nov;11(11):797–805.