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Auriculocondylar syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Auriculocondylar syndrome

Auriculocondylar syndrome is a rare genetic condition that primarily affects the development of the ears and the lower jaw.

Overview

This condition is characterized by distinctive ear abnormalities and underdevelopment of the lower jaw (mandible). Because the jaw abnormalities can affect breathing, infants with this syndrome may require a breathing tube. The severity of features can vary significantly, even among family members.

Symptoms

  • Ear abnormalities: A "question mark" ear shape caused by a split separating the upper ear from the earlobe. Other features include low-set ears, narrow ear canals, skin tags, and hearing loss.
  • Jaw abnormalities: A small lower jaw (micrognathia) caused by underdevelopment of the condyle, which can impair the function of the temporomandibular joint (TMJ).
  • Facial features: Prominent cheeks, small mouth (microstomia), tongue positioned further back than normal (glossoptosis), and facial asymmetry.
  • Other: Cleft palate and, in rare cases, developmental delays or intellectual disabilities.

Causes

Auriculocondylar syndrome is caused by variants in genes such as GNAI3, EDN1, and PLCB4. These genes are involved in chemical signaling pathways that regulate the migration and maturation of neural crest cells during early development. These cells are responsible for forming the jawbones, facial muscles, and structures of the ears.

Inheritance

The condition can be inherited in two ways:

  • Autosomal dominant: Typically caused by variants in GNAI3 or PLCB4, where one copy of the altered gene is sufficient to cause the disorder. This can include new (de novo) mutations.
  • Autosomal recessive: Caused by variants in EDN1 and some cases of PLCB4, where both copies of the gene must have a variant.

Other Names

  • Auriculo-condylar syndrome
  • Dysgnathia complex
  • Question-mark ear syndrome

Frequently Asked Questions

If the infant has severe micrognathia that pushes the tongue backward (glossoptosis) and causes airway obstruction, you may notice noisy breathing, cyanosis, or difficulty maintaining oxygen saturation. Doctors will assess airway patency with pulse‑oximetry and may perform a flexible laryngoscopy. When oxygen levels drop or the baby cannot feed without desaturation, a temporary nasopharyngeal or endotracheal tube is placed until the jaw grows or surgical intervention is possible.
Reconstructive ear surgery (otoplasty) can improve the cosmetic appearance and, in some cases, enlarge a narrowed ear canal to aid hearing. Surgeons typically wait until the child is 5–7 years old, when ear cartilage is more pliable and the child can cooperate with postoperative care. Hearing loss may also be addressed with bone‑conduction hearing aids or middle‑ear implants, depending on the severity of canal stenosis.
Each child of an affected parent has a 50 % chance of inheriting the pathogenic variant. Prenatal testing (chorionic villus sampling or amniocentesis) or pre‑implantation genetic diagnosis (PGD) can identify the variant early. Even with a known mutation, the severity can vary, so counseling with a clinical geneticist helps families weigh testing options and set realistic expectations.
Use upright or side‑lying positioning during feeds to keep the airway open, and consider a specialized bottle with a slow‑flow nipple to reduce suction pressure. Some clinicians recommend a “prone‑position” (tummy‑down) feeding while the infant is closely supervised. If oral feeding remains unsafe, a nasogastric tube or gastrostomy may be used temporarily to ensure adequate nutrition while the jaw develops.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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