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Physical Symptoms and Manifestations

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22q11.2 deletion syndrome is a multisystem condition that commonly causes congenital heart defects, cleft palate, low calcium levels, and immune system deficiencies. Because of these immune challenges, patients must have their T-cell counts evaluated by an immunologist before receiving any live vaccines.

Key Takeaways

  • • About 75% of individuals with 22q11.2 deletion syndrome are born with heart defects, most commonly conotruncal defects like Tetralogy of Fallot.
  • • An underdeveloped thymus can lead to low T-cell counts, requiring patients to avoid live vaccines until cleared by an immunologist.
  • • Underdeveloped parathyroid glands often cause low blood calcium (hypocalcemia), which can trigger muscle cramping, tingling, or seizures during illness or stress.
  • • Palate issues, including submucous cleft palate and velopharyngeal insufficiency, frequently cause hypernasal speech and feeding difficulties.
  • • A baseline renal ultrasound is recommended upon diagnosis, as patients may be born with kidney anomalies such as missing or joined kidneys.

22q11.2 deletion syndrome is a multisystem condition, meaning it can affect several different organs and systems in the body. Because of the extreme variability of the syndrome, it is important to remember that most individuals will only have some of these features, not all of them [1][2].

Heart Health

About 75% of individuals with the syndrome are born with a heart defect [2]. The most common are conotruncal defects, which are problems with the “outflow tract”—the part of the heart where the main blood vessels connect [3].

  • Tetralogy of Fallot: A combination of four related heart defects that affect how blood flows to the lungs [3].
  • Interrupted Aortic Arch: A condition where the main artery (the aorta) is not fully formed [3].

Immune System and the Thymus

The thymus is a small gland in the upper chest that acts as a “training camp” for T-cells, which fight infections [4][5].

  • Thymic Hypoplasia: Many people with 22q11.2DS have a smaller-than-normal thymus [4].
  • T-cell Issues: This can lead to lower numbers of T-cells, making it harder to fight off viruses and fungal infections [5].
  • CRITICAL SAFETY WARNING: Live vaccines (such as MMR, Varicella, and Rotavirus) should be withheld until an immunologist evaluates you or your child’s T-cell counts [6]. Administering live vaccines to someone with severe T-cell deficiency can cause life-threatening infections [7].

Calcium and the Parathyroid Glands

The parathyroid glands are four tiny glands in the neck that control blood calcium levels. In 22q11.2DS, these glands may be underdeveloped [8].

  • Hypoparathyroidism: This leads to hypocalcemia (low blood calcium) [8][9].
  • Symptoms & Risks: Low calcium can return during times of stress, puberty, surgery, or illness [10][2]. Watch for physical signs such as muscle cramps, twitching, tingling or numbness in the fingers and lips, tremors, and in severe cases, seizures [10]. Seek immediate medical attention if these occur.

Palate and Speech

  • Overt Cleft Palate: A visible opening in the roof of the mouth [11].
  • Submucous Cleft Palate (SMCP): An “invisible” cleft where the muscles are not joined correctly, but the skin covering them looks normal [11][12].
  • Velopharyngeal Insufficiency (VPI): This occurs when the soft palate doesn’t close properly against the back of the throat during speech [11][13]. This allows air to escape through the nose, causing a “hypernasal” voice [14].

Kidneys and Other Features

  • Kidney Anomalies: Some individuals may be born with one kidney, cysts, or kidneys that are joined together. This is why a renal ultrasound is a standard baseline test for all new diagnoses [11].
  • Feeding Difficulties: Many infants have trouble with reflux or swallowing [15].

Frequently Asked Questions

Why do I need to avoid live vaccines if my child has 22q11.2 deletion syndrome?
Because many individuals with the syndrome have an underdeveloped thymus, they may have low T-cell counts, which weakens their immune system. Giving a live vaccine to someone with a severe T-cell deficiency can cause life-threatening infections. An immunologist must evaluate T-cell levels before any live vaccines are given.
What are the warning signs of low calcium in 22q11.2 deletion syndrome?
Low blood calcium, known as hypocalcemia, can cause physical signs like muscle cramps, twitching, tremors, or tingling and numbness in the fingers and lips. In severe cases, it can cause seizures. These symptoms can be triggered by stress, illness, surgery, or puberty and require immediate medical attention.
What heart defects are most common with this syndrome?
The most frequent heart problems are conotruncal defects, which affect the blood vessels connecting to the heart. This commonly includes Tetralogy of Fallot and interrupted aortic arch. About 75% of individuals with the syndrome are born with some form of heart defect.
How does 22q11.2 deletion syndrome affect the palate and speech?
The syndrome frequently causes structural differences like an overt or submucous cleft palate. It can also cause velopharyngeal insufficiency, where the soft palate fails to close completely against the back of the throat. This allows air to escape through the nose, resulting in a hypernasal voice and sometimes causing liquids to come out of the nose during drinking.

Questions for Your Doctor

  • • Has my (or my child's) T-cell count been evaluated recently, and are we explicitly cleared to receive live vaccines?
  • • What is our specific plan of action if physical signs of low calcium (like muscle twitching or numbness) occur?
  • • Which type of conotruncal heart defect is present, and what is the exact timeline for surgical intervention or monitoring?
  • • Should we be evaluated by an ENT or speech therapist for a submucous cleft palate or velopharyngeal insufficiency?

Questions for You

  • • Have I noticed any unusual muscle cramping, tremors, or tingling in my (or my child's) fingers and lips recently?
  • • Am I keeping a log of how frequently infections occur and how long they take to heal?
  • • Have I noticed liquids coming out of the nose during drinking, or a very nasal quality to speech?

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References

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    Candidate modifier genes for immune function in 22q11.2 deletion syndrome.

    Pinnaro CT, Henry T, Major HJ, et al.

    Molecular genetics & genomic medicine 2020; (8(1)):e1057 doi:10.1002/mgg3.1057.

    PMID: 31830774
  2. 2

    Clinical characteristics and immunological status of patients with 22q11.2 deletion syndrome in Northern Thailand.

    Ua-Areechit T, Varnado P, Tengsujaritkul M, et al.

    Asian Pacific journal of allergy and immunology 2023; (41(1)):89-95 doi:10.12932/AP-241019-0671.

    PMID: 32416666
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    22q11.2 deletion syndrome and congenital heart disease.

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    American journal of medical genetics. Part C, Seminars in medical genetics 2020; (184(1)):64-72 doi:10.1002/ajmg.c.31774.

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    Risk factors of clinical dysimmune manifestations in a cohort of 86 children with 22q11.2 deletion syndrome: A retrospective study in France.

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    American journal of medical genetics. Part A 2019; (179(11)):2207-2213 doi:10.1002/ajmg.a.61336.

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    Resolution of Primary Immune Defect in 22q11.2 Deletion Syndrome.

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    PMID: 28429103
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    Chromosome 22q11.2 Deletion Syndrome: A Comprehensive Review of Molecular Genetics in the Context of Multidisciplinary Clinical Approach.

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    International journal of molecular sciences 2023; (24(9)) doi:10.3390/ijms24098317.

    PMID: 37176024
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    The 22q11.2 deletion syndrome: Genetic mechanisms, clinical manifestations, and therapeutic strategies.

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    Clinica chimica acta; international journal of clinical chemistry 2026; (586()):120893 doi:10.1016/j.cca.2026.120893.

    PMID: 41690495
  10. 10

    Palatoschisis, Schizophrenia and Hypocalcaemia: Phenotypic Expression of 22q11.2 Deletion Syndrome (DiGeorge Syndrome) in an Adult.

    van der Meijs ME, Schweitzer DH, Boom H

    European journal of case reports in internal medicine 2021; (8(4)):002411 doi:10.12890/2021_002411.

    PMID: 33987118
  11. 11

    22q11.2 deletion syndrome.

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    PMID: 27189754
  12. 12

    Prevalence of 22q11.2 microdeletion syndrome in Iranian patients with cleft palate.

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    Advanced biomedical research 2016; (5()):201 doi:10.4103/2277-9175.192728.

    PMID: 28217639
  13. 13

    Characteristics of velopharyngeal dysfunction in 22q11.2 deletion syndrome: a retrospective case-control study.

    Failla S, You P, Rajakumar C, et al.

    Journal of otolaryngology - head & neck surgery = Le Journal d'oto-rhino-laryngologie et de chirurgie cervico-faciale 2020; (49(1)):54 doi:10.1186/s40463-020-00451-4.

    PMID: 32736586
  14. 14

    Assessment of the Velopharyngeal Mechanism at Rest and During Speech in Children With 22q11.2DS: A Cross-Sectional Study.

    Kollara L, Perry JL, Kirschner RE, et al.

    The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association 2023; (60(10)):1250-1259 doi:10.1177/10556656221100674.

    PMID: 35575228
  15. 15

    Multiple Intestinal Anomalies in a Newborn with 22q11.2 Microdeletion Syndrome: A Case Report and Literature Review.

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    PMID: 39086451

This page outlines physical symptoms associated with 22q11.2 deletion syndrome for educational purposes only. Always consult your medical team for personalized monitoring, treatment, and vaccine clearance.

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