Job Syndrome (Hyper-IgE) Mnemonic: FATED & Flowchart

Job syndrome, the autosomal dominant hyper-IgE syndrome, is caused by a dominant-negative STAT3 mutation that leaves patients with almost no Th17 cells. Low IL-17 and IL-22 weaken the inflammatory call for white blood cells and the antimicrobial peptides that defend skin and lung, and blocked IL-6 signaling blunts inflammation, so Staphylococcus aureus abscesses are "cold" and pneumonias heal into pneumatoceles. Expect eczema from the newborn period, mucocutaneous candidiasis, IgE above 2,000 IU/mL with eosinophilia, and the non-immune clues summed up by FATED: coarse facies, cold abscesses, retained primary teeth, high IgE and dermatologic disease, plus fractures after minor trauma and scoliosis.

The flowchart in 6 steps

Step 1: Spot the infection pattern

• Recurrent S. aureus skin boils that are "cold": they lack the redness, warmth and tenderness you would expect.
• Recurrent pneumonias from early childhood, most often S. aureus, Streptococcus pneumoniae and Haemophilus influenzae.
• Chronic mucocutaneous candidiasis of the mouth, nails and vagina, in about 80% of patients.

Step 2: Check the skin history

A rash in the newborn period (often labeled eosinophilic pustulosis) that evolves into eczematoid dermatitis is typical. Eczema plus recurrent staph abscesses is the entry point to this diagnosis.

Step 3: Find the non-immune clues

• Retained primary teeth: baby teeth fail to shed because their roots don't resorb, so they sit alongside erupting permanent teeth.
• Characteristic face by adolescence: facial asymmetry, deep-set eyes, a broad nose and prominent skin pores.
• Bones and joints: osteoporosis with minimal-trauma fractures from early childhood, scoliosis (about 75% by age 16), joint hyperextensibility and sometimes craniosynostosis.
• Other: Chiari I malformation (about 20%), tortuous or dilated arteries including coronary artery aneurysms, and a higher lymphoma risk.

Step 4: Read the labs

• IgE above 2,000 IU/mL (adult normal is under 100 IU/mL).
• Eosinophilia (above 700/µL).
• Near absence of IL-17-producing Th17 cells, with fewer memory T and B cells.

Step 5: Name the mechanism

STAT3 carries signals from IL-6, IL-21 and IL-23. A dominant-negative mutant protein poisons the normal copy, so naive CD4 T cells cannot become Th17 cells:

• Less IL-17: the inflammatory signals that bring white blood cells into infected tissue are weak, so defense fails in skin and lung, the two sites where staph infections cluster.
• Less IL-17 and IL-22: keratinocytes and airway epithelium make fewer antimicrobial peptides such as β-defensins, and anti-Candida defense fails.
• Blocked IL-6 signaling: fever, CRP elevation and local inflammation are blunted, which is why abscesses look "cold."
• Abnormal lung healing: pneumonias leave pneumatoceles and bronchiectasis, which can become infected with Aspergillus fumigatus or Scedosporium.

How cytokines steer naive T cells into subsets is covered in T-cell activation.

Step 6: Confirm and treat

• Confirm with STAT3 genetic testing; the NIH clinical scoring system guides suspicion. Many cases (about half or more) are de novo, so the family history is often negative.
• Prevent staph: twice-daily trimethoprim-sulfamethoxazole prophylaxis, plus early, aggressive treatment of every infection, including drainage of abscesses.
• Skin: dilute bleach baths and chlorhexidine; dupilumab and omalizumab have improved the eczema.
• Selected patients: antifungal prophylaxis (for example, where Coccidioides is endemic) and IgG replacement.
• Hematopoietic stem cell transplant has improved the infection problem in successful recipients, but its effect on the skeletal and other non-immune features is unclear.

FATED: the mnemonic

FATED leaves out the skeleton, so add fractures after minor trauma and scoliosis to the checklist.

Job syndrome vs the look-alikes

For the oxidative-burst defect in detail, see chronic granulomatous disease.

Exam traps

• High IgE alone is not Job syndrome. DOCK8 deficiency and Wiskott-Aldrich syndrome also raise IgE; the dental and skeletal findings point to STAT3.
• "Cold" is not "no pus." Job abscesses lack redness, warmth and tenderness. The infant who cannot form pus at all, with a very high white count and a late-separating umbilical cord, has leukocyte adhesion deficiency.
• Eczema plus small platelets is Wiskott-Aldrich syndrome.
• Warts, molluscum and severe herpes with bad allergies and autosomal recessive inheritance suggest DOCK8 deficiency.
• The defect is cytokine signaling and Th17 differentiation, not NADPH oxidase; an abnormal DHR test belongs to chronic granulomatous disease.
• Muted fever and CRP. Because IL-6 signaling is blunted, a serious infection can produce little fever or CRP.

Worked example

Vignette. A 10-year-old girl has had eczema since her first weeks of life, three S. aureus skin abscesses that were neither warm nor tender, and two pneumonias; chest CT shows a thin-walled lung cyst. Several primary teeth remain although her permanent teeth are erupting, and she fractured her forearm falling from a chair. IgE is 4,800 IU/mL and eosinophils are 1,100/µL. What is the underlying defect?

Answer: A dominant-negative STAT3 mutation that prevents Th17 differentiation (Job syndrome).

Reasoning: Cold staph abscesses, a pneumatocele, retained primary teeth, a minimal-trauma fracture and an IgE over 2,000 IU/mL complete the STAT3 picture. NADPH oxidase deficiency gives catalase-positive infections and granulomas, CD18 deficiency gives pus-free infections and delayed cord separation, and WAS protein deficiency gives thrombocytopenia with small platelets.

Key takeaways

• Job syndrome = autosomal dominant hyper-IgE syndrome = dominant-negative STAT3, often de novo.
• STAT3 → Th17 → IL-17 and IL-22: weaker white-cell recruitment and fewer antimicrobial peptides at skin and lung, plus blunted IL-6 inflammation.
• FATED: coarse Facies, cold staph Abscesses, retained primary Teeth, hyper-IgE (above 2,000 IU/mL), Dermatologic disease; add fractures and scoliosis.
• Lungs: staph pneumonias leave pneumatoceles and bronchiectasis that invite Aspergillus.
• Treatment: trimethoprim-sulfamethoxazole prophylaxis, early drainage and antibiotics, and skin care.
• DOCK8 deficiency is the autosomal recessive hyper-IgE look-alike with viral skin infections and no skeletal or dental signs.

Sources

• STAT3 Hyper IgE Syndrome — GeneReviews, NCBI Bookshelf
• Hyper-IgE Syndromes — StatPearls, NCBI Bookshelf
• Autosomal dominant hyper-IgE syndrome — MedlinePlus Genetics
• DOCK8 immunodeficiency syndrome — MedlinePlus Genetics
• Chronic Granulomatous Disease — StatPearls, NCBI Bookshelf
• Leukocyte Adhesion Deficiency — StatPearls, NCBI Bookshelf