NRXN1 and Intellectual disability: Deletions within NRXN1 have been identified in individuals diagnosed with a range of neurodevelopmental disorders (NDD): including intellectual disability, developmental delay, speech and language delay [10, 11] autism spectrum disorders (ASD) [12–17] schizophrenia [18–21], and when homozygously deleted, early-onset epilepsy [22] or Pitt-Hopkins-like Syndrome [23].