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PLCB4 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

PLCB4 gene

The PLCB4 gene provides instructions for making a protein involved in cell signaling that is essential for the development of the head, face, and eyes.

Normal Function

The PLCB4 gene provides instructions for making the beta 4 isoform of the protein phospholipase C. This protein is part of the phosphoinositide cycle, a signaling pathway that transmits information from the outside of the cell to the inside, ultimately influencing various cell activities.

The beta 4 isoform is critical for the development of the first and second pharyngeal arches, which form the bones and tissues of the head and face, including the jawbones, facial muscles, and ears. It is also important for the proper functioning of the retina, the light-sensitive tissue at the back of the eye.

Health Conditions Related to Genetic Changes

Auriculocondylar syndrome

Variants in the PLCB4 gene cause auriculocondylar syndrome, a disorder affecting the development of facial features, particularly the ears and the lower jaw (mandible). These genetic variants typically lead to the substitution of one amino acid for another in the beta 4 isoform of phospholipase C. These changes impair the protein's function, disrupting the cell signaling necessary for the proper development of structures derived from the first and second pharyngeal arches.

Frequently Asked Questions

Prenatal ultrasound can sometimes detect jaw and ear anomalies, but definitive diagnosis requires genetic testing. If a family has a known PLCB4 mutation, amniocentesis or chorionic villus sampling can identify the variant in the fetus, allowing for early counseling and planning.
Eye involvement may include refractive errors, strabismus, or retinal abnormalities. Regular ophthalmology exams are recommended. Corrective lenses, vision therapy, or, in rare cases, surgical intervention may be needed to address visual deficits. Early detection improves visual outcomes.
Yes. Jaw and ear anomalies can affect chewing, swallowing, and speech. Early referral to a speech‑language pathologist and feeding specialist can help improve oral motor skills, reduce aspiration risk, and support normal speech development.
Individuals often have a small, underdeveloped lower jaw (micrognathia), a flattened or recessed chin, and abnormal ear shape or position. The ears may be small, low‑set, or have a distinctive “ear‑like” appearance. These features are usually evident at birth or within the first few months.
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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