A chromosomal anomaly characterized by distinctive facial dysmorphic features, hypotonia, developmental delay, intellectual disability, seizures, heart defects, hearing impairment and prenatal onset growth deficiency. The disease is Monarch Disease Ontology identifier MONDO_0011929 (chromosome 1p36 deletion syndrome). Also known as: 1p telomere deletion syndrome, 1p36 deletion syndrome, 1p36 microdeletion syndrome, Del(1)(p36), chromosome 1p36 deletion syndrome, distal, isolated cases, deletion 1p36, deletion 1pter, monosomy 1p36.