| Section | Item | Suggested ontology term(s) | Notes/frequency |
|---|---|---|---|
| Phenotype | Microcephaly | Microcephaly (HP:0000252) | Common and often severe/progressive; reported in 84/95 (88%), with congenital or postnatal onset in reported cohorts |
| Phenotype | Micrognathia / mandibular hypoplasia | Micrognathia (HP:0000347); Mandibular hypoplasia (HP:0000347) | Very common; micrognathia 93/95 (98%) in one summary cohort |
| Phenotype | Malar hypoplasia | Malar flattening (HP:0000272) | Common; 84/90 (93%) in one summary cohort |
| Phenotype | Microtia / dysplastic external ears | Microtia (HP:0008551); Abnormality of the pinna (HP:0000377); Dysplastic pinna (HP:0008553) | Very common; small/dysplastic pinnae 90/93 (97%) |
| Phenotype | Preauricular tags | Preauricular skin tag (HP:0000384) | Recurrent ear-associated feature |
| Phenotype | Hearing loss | Hearing impairment (HP:0000365); Conductive hearing impairment (HP:0000405); Mixed hearing impairment (HP:0000408); Sensorineural hearing impairment (HP:0000407) | Common; hearing loss 75/89 (84%); conductive predominates |
| Phenotype | Auditory canal stenosis / atresia | External auditory canal stenosis (HP:0000400); External auditory canal atresia (HP:0000413) | Frequent; auditory atresia/stenosis 50/78 (64%) |
| Phenotype | Choanal atresia | Choanal atresia (HP:0000453) | Recurrent major craniofacial finding |
| Phenotype | Cleft palate | Cleft palate (HP:0000175) | Common; 45/94 (48%) in one cohort summary |
| Phenotype | Cleft zygomatic arch / zygomatic defect | Abnormal zygomatic bone morphology (HP:0011327) | Expanded phenotype; CT can show unilateral or bilateral zygomatic arch clefting |
| Phenotype | Maxillary hypoplasia / midface hypoplasia | Maxillary hypoplasia (HP:0000327); Midface retrusion (HP:0011800) | Recurrent craniofacial feature |
| Phenotype | Global developmental delay | Global developmental delay (HP:0001263) | Very common; developmental delay reported in essentially all compiled cases |
| Phenotype | Intellectual disability | Intellectual disability (HP:0001249) | Common; severity variable |
| Phenotype | Speech delay / expressive language delay | Delayed speech and language development (HP:0000750); Expressive language delay (HP:0002474) | Common; first words often at 20–30 months |
| Phenotype | Motor delay | Delayed gross motor development (HP:0002194) | Common; delayed walking/sitting reported |
| Phenotype | Seizures | Seizure (HP:0001250) | Reported in subsets; 23/83 (28%) in one summary cohort |
| Phenotype | Congenital heart defect | Congenital heart malformation (HP:0001627); Atrial septal defect (HP:0001631) | Recurrent extracranial feature; ~31% in one summary cohort |
| Phenotype | Esophageal atresia / tracheoesophageal anomaly | Esophageal atresia (HP:0002031); Tracheoesophageal fistula (HP:0002575) | Recurrent extracranial feature; esophageal atresia 24/91 (26%) |
| Phenotype | Thumb anomalies | Abnormal thumb morphology (HP:0009609); Triphalangeal thumb (HP:0001199); Proximally placed thumb (HP:0009623) | Reported in subsets; ~25–30% |
| Phenotype | Short stature / growth delay | Short stature (HP:0004322); Postnatal growth retardation (HP:0008897) | Reported in about one-third in some summaries |
| Phenotype | Feeding difficulty / dysphagia | Feeding difficulties (HP:0011968); Dysphagia (HP:0002015) | Common in severe neonatal cases; may accompany Pierre Robin sequence or EA/TEF |
| Phenotype | Delayed myelination | Delayed CNS myelination (HP:0012447) | Seen on MRI in a subset |
| Phenotype | White matter abnormality | Abnormality of cerebral white matter (HP:0002500) | Nonspecific white matter changes reported on MRI |
| Phenotype | Ventricular enlargement | Ventriculomegaly (HP:0002119) | Mild posterior lateral ventricular dilation reported in some cases |
| Phenotype | Epibulbar dermoid | Epibulbar dermoid (HP:0001140) | Expanded phenotype; reported in individual cases |
| Mechanism | Pre-mRNA splicing defect | mRNA splicing, via spliceosome (GO:0000398) | Core upstream disease mechanism |
| Mechanism | Alternative splicing dysregulation | Regulation of alternative mRNA splicing, via spliceosome (GO:0000381) | Includes exon skipping events such as Mdm2 exon 3 skipping |
| Mechanism | Neural crest development defect | Neural crest cell development (GO:0014032); Neural crest cell migration (GO:0001755) | Best-supported developmental cell-population vulnerability |
| Mechanism | Apoptotic cell death | Apoptotic process (GO:0006915); Intrinsic apoptotic signaling pathway (GO:0097193) | Increased in neural crest/neural progenitor contexts |
| Mechanism | p53 pathway activation | Signal transduction by p53 class mediator (GO:0072331); Regulation of transcription by p53 class mediator (GO:0072332) | Supported by mouse and zebrafish mechanistic studies |
| Mechanism | Craniofacial morphogenesis defect | Craniofacial skeletal system development (GO:1904888); Branchiomeric skeletal muscle development / pharyngeal arch development-related annotation | Downstream morphogenetic consequence |
| Mechanism | Neurodevelopmental defect | Brain development (GO:0007420); Forebrain development (GO:0030900) | Relevant to microcephaly and developmental delay |
| Cell type | Cranial neural crest cells | Neural crest cell (CL:0000007); Cranial neural crest cell (CL:0002320) | Strongest disease-relevant cell population from models |
| Cell type | Neural progenitor cells | Neural progenitor cell (CL:0000047) | Supported by zebrafish and brain-development studies |
| Cell type | Neuroepithelial cells | Neuroepithelial cell (CL:0000644) | Relevant to early CNS development |
| Cell type | Chondrocytes | Chondrocyte (CL:0000138) | Relevant to craniofacial cartilage development |
| Cell type | Osteoblast lineage cells | Osteoblast (CL:0000062) | Relevant to mandibular/zygomatic/maxillary hypoplasia |
| Anatomy | Mandible | mandible (UBERON:0001684) | Primary craniofacial skeletal site |
| Anatomy | Maxilla | maxilla (UBERON:0001685) | Primary craniofacial skeletal site |
| Anatomy | Zygomatic bone / arch | zygomatic bone (UBERON:0001687) | Site of clefting/hypoplasia in some patients |
| Anatomy | External ear / pinna | external ear (UBERON:0001032); pinna (UBERON:0001691) | Major affected structure |
| Anatomy | External auditory canal | external auditory canal (UBERON:0000912) | Frequent stenosis/atresia |
| Anatomy | Choana | choana (UBERON:0001719) | Choanal atresia site |
| Anatomy | Palate | secondary palate (UBERON:0001708) | Cleft palate site |
| Anatomy | Brain / cerebral white matter | brain (UBERON:0000955); cerebral white matter (UBERON:0002316) | Relevant to microcephaly, delayed myelination, white matter abnormalities |
| Anatomy | Esophagus | esophagus (UBERON:0001043) | Relevant to esophageal atresia |
| Anatomy | Heart / atrial septum | heart (UBERON:0000948); atrial septum (UBERON:0002085) | Relevant to congenital heart disease/ASD |
| Treatment/management | Tracheostomy | tracheostomy (MAXO:0000128) | Reported in severe airway cases; 11/54 (20%) in one cohort summary |
| Treatment/management | Gastrostomy / feeding tube support | gastrostomy (MAXO:0000126); enteral tube feeding (MAXO:0000106) | Used in severe feeding/airway cases |
| Treatment/management | Hearing support | hearing aid use (MAXO:0000058) | Reasonable management action for conductive/mixed hearing loss |
| Treatment/management | Speech therapy | speech therapy (MAXO:0000016) | Common supportive intervention for expressive language delay |
| Treatment/management | Genetic testing | sequence analysis (MAXO:0000147); exome sequencing (MAXO:0000137); genome sequencing (MAXO:0000138); chromosomal microarray analysis (MAXO:0000014) | Core diagnostic/management action in modern care pathways |
| Treatment/management | Airway support | airway management (MAXO:0000112) | Relevant for choanal atresia, glossoptosis, neonatal respiratory compromise |
| Treatment/management | Feeding support | feeding therapy (MAXO:0000104); nutritional supplementation/support (MAXO:0000105) | Relevant for dysphagia and poor suck/swallow coordination |
| Treatment/management | Craniofacial surgery | craniofacial surgical intervention (MAXO:0001173) | Disease-specific reconstructive needs may arise; evidence is case-based |
| Treatment/management | Cardiac evaluation/intervention | cardiology evaluation/intervention (MAXO term family) | Supportive management for CHD/ASD |
| Treatment/management | Experimental p53 inhibition | small molecule inhibitor treatment (MAXO:0000013) | Preclinical only; pifithrin-α partially rescued mouse craniofacial phenotype |


*Table: This table maps evidence-based mandibulofacial dysostosis with microcephaly features to suggested ontology terms across HPO, GO, CL, UBERON, and MAXO. It is useful as a knowledge-base curation scaffold for phenotype, mechanism, anatomy, cell type, and management annotations. (pqac-00000003, pqac-00000005, pqac-00000008, pqac-00000010, pqac-00000017, pqac-00000018, pqac-00000025, pqac-00000026, pqac-00000030)*