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PubMed This is a summary of 63 peer-reviewed journal articles Updated
Genetics

Understanding the Diagnosis and the CHD7 Gene

At a Glance

CHARGE syndrome is a complex genetic condition primarily caused by a new mutation in the CHD7 gene. Diagnosis is confirmed through genetic testing and clinical criteria, including hallmark features like underdeveloped semicircular canals, which doctors evaluate using specialized imaging.

Welcome to this guide for families navigating a CHARGE syndrome diagnosis. This resource is designed to help you understand your child’s condition, navigate the medical system, and advocate for their long-term care. You are not alone on this journey, and connecting with organizations like the CHARGE Syndrome Foundation can provide invaluable support.

Please explore the sections below for detailed information on specific challenges:

01

The NICU Journey: Airway, Heart, and Feeding

Learn about the NICU journey for babies with CHARGE syndrome. Understand airway emergencies like choanal atresia, heart defects, and safe feeding with G-tubes.

02

Managing Hearing, Vision, and Sensory Integration

Learn how CHARGE syndrome affects your child's hearing, vision, and balance. Understand colobomas, cochlear implants, and sensory integration strategies.

03

Development, Behavior, and Long-Term Care

Understand long-term care for CHARGE syndrome. Learn about developmental milestones, behavior and autism risk, hormone therapy for puberty, and dysautonomia.

Receiving a diagnosis for your child can feel like finally finding a map for a journey you didn’t expect to take. While the term CHARGE syndrome started as a simple checklist of symptoms, we now understand it as a complex genetic condition primarily caused by changes in a single gene called CHD7 [1][2].

The Role of the CHD7 Gene

The CHD7 gene provides instructions for making a protein that acts like a “master switch” or “manager” for other genes [3]. It belongs to a group of proteins called chromatin remodelers, which help pack and unpack DNA so the body can read the right instructions at the right time [3][4].

In about 90% of children with a clinical diagnosis of CHARGE, a mutation (a “typo” in the genetic code) is found in the CHD7 gene [2].

Why is this gene so important?

During early pregnancy, the CHD7 protein is vital for the development of neural crest cells. These are “multi-purpose” cells in the embryo that migrate to different parts of the body to form critical structures [5][6]. Because CHD7 helps guide where these cells go and what they become, a mutation can affect many different systems at once, including:

  • The Face and Mouth: Formation of the jaw, ears, and nasal passages [5][7].
  • The Heart: The development of the complex “plumbing” of the heart [8].
  • The Nervous System: The growth of specific nerves and brain structures, like the olfactory bulbs (which control smell) [9][10].

What does “De Novo” mean?

In the vast majority of cases, the CHD7 mutation is de novo, which is Latin for “from the beginning” or “new” [1]. This means the mutation happened by chance in the egg or sperm, or very shortly after conception. It was not passed down from the parents’ own genetic code, and nothing either parent did—or didn’t do—caused it to happen [1][11].

How the Diagnosis Has Evolved

The cluster of symptoms was first described independently in 1979, but the name “CHARGE” was created in 1981 by Dr. Roberta Pagon and colleagues as an acronym for six common features: Coloboma, Heart defects, Atresia choanae (blocked nasal passages), Retardation of growth/development, Genital abnormalities, and Ear abnormalities [12].

Today, doctors use more precise clinical criteria, because we know that a child can have CHARGE syndrome even if they don’t have every letter of the original acronym [4][13].

Modern Diagnostic Criteria (Blake & Verloes)

Current standards, such as the Verloes criteria, divide features into “Major” and “Minor” categories to help doctors make a more accurate diagnosis [14].

Feature Type Description
Major Criteria Coloboma (eye notch), Choanal Atresia (blocked nasal passages), and Semicircular Canal Anomalies (inner ear issues) [14][15].
Minor Criteria Heart defects, cranial nerve issues (like facial palsy or swallowing trouble), ear malformations, and growth or developmental delays [16][17].

A “definite” diagnosis is often made if a child has all three major criteria, or two major and several minor criteria [14]. However, the discovery of a CHD7 mutation is now often considered a “Major” finding in itself, confirming the diagnosis even if the child’s physical symptoms are milder or atypical [4][12].

The “Hallmark” Feature: Semicircular Canals

One of the most consistent findings in CHARGE syndrome—seen in nearly all children with the condition—is the absence or underdevelopment of the semicircular canals in the inner ear [18].

These three tiny, fluid-filled loops are responsible for our sense of balance. In CHARGE, they are often hypoplastic (underdeveloped) or show aplasia (completely missing) [18]. Because this feature is so rare in other conditions, doctors consider it a “hallmark” or pathognomonic sign of CHARGE [18][19]. If a doctor suspects CHARGE, they will often order specialized imaging to look specifically at these structures.

Diagnostic Completeness Checklist

If your child is being evaluated for CHARGE, ensure the following tests are discussed or performed to provide a complete picture:

  • [ ] Genetic Testing: CHD7 sequencing plus MLPA (a test that looks for missing or extra pieces of the gene) [20][16].
  • [ ] Temporal Bone Imaging: High-resolution CT scan or MRI to evaluate the semicircular canals and the cochlea (hearing organ) [18][21].
  • [ ] Brain MRI: To check for olfactory bulb deficiency (the sense of smell) and other brain structures like the cerebellum [9][10].
  • [ ] Echocardiogram: A specialized ultrasound to look for heart defects [8].
  • [ ] Eye Exam: A thorough exam by a pediatric ophthalmologist to look for colobomas [14].
  • [ ] Renal Ultrasound: To evaluate the kidneys and urinary tract for structural anomalies, as they are a historical and common component of the syndrome [22].
  • [ ] Audiological Evaluation: Including an Auditory Brainstem Response (ABR) to establish a functional hearing baseline, which is essential before beginning deafblind interventions [23].

Common questions in this guide

What does a CHD7 gene mutation mean for my child?
A mutation in the CHD7 gene is the primary cause of CHARGE syndrome. This gene acts as a master switch for development during pregnancy, which is why a change in it can affect many different parts of the body, including the heart, eyes, and ears.
Are CHD7 gene mutations inherited from parents?
In the vast majority of cases, a CHD7 mutation is "de novo," meaning it is a new change that happened completely by chance. It is usually not passed down from the parents, and nothing the parents did before or during pregnancy caused it to happen.
Can a child have CHARGE syndrome without having all the classic symptoms?
Yes, modern diagnostic guidelines allow doctors to diagnose CHARGE syndrome based on varying combinations of major and minor features. The discovery of a CHD7 gene mutation can confirm the diagnosis even if a child's physical symptoms are mild or atypical.
What is the hallmark physical sign of CHARGE syndrome?
The most consistent physical finding in CHARGE syndrome is the absence or underdevelopment of the semicircular canals in the inner ear. Because this affects balance and is very rare in other conditions, doctors look for it specifically using specialized imaging.
What imaging and tests are needed to confirm a CHARGE syndrome diagnosis?
A complete evaluation usually includes genetic testing for the CHD7 gene, high-resolution imaging of the temporal bone and brain, an echocardiogram for the heart, eye exams, and an audiological evaluation to establish a baseline for hearing.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What specific CHD7 mutation was found in my child, and what does it tell us about their diagnosis?
  2. 2.Since we found a CHD7 mutation, is my child considered to have CHARGE syndrome even if they don't meet every classic clinical criterion?
  3. 3.Was a temporal bone CT or MRI performed to check for semicircular canal anomalies, and what were the results?
  4. 4.Was the CHD7 mutation 'de novo' (new), and have we (the parents) been tested to confirm our own genetic status?
  5. 5.Based on my child's specific features, which specialists (like ENT, cardiology, or ophthalmology) should we see first?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (23)
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    Establishment of an induced pluripotent stem cell line from a patient with CHARGE syndrome carrying a CHD7 (p.L1151Gfs*17) mutation.

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    Molecular dissection of CHARGE syndrome highlights the vulnerability of neural crest cells to problems with alternative splicing and other transcription-related processes.

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This page provides educational information about CHARGE syndrome diagnosis and the CHD7 gene. It is not intended to replace professional medical advice; please consult your child's genetics team or pediatrician for specific clinical guidance.

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