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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Hematology

Building Your Care Team and Daily Life

At a Glance

HO-1 deficiency care requires a coordinated team of blood, immune, lung, kidney, and genetics specialists. Families should keep a written fever plan for asplenia, follow infection-prevention advice, organize complete medical records, and seek rare-disease expertise.

Managing a diagnosis as rare as HO-1 deficiency requires more than just a single doctor; it requires a specialized network. Because fewer than 20 cases have been reported worldwide, you are essentially part of a small global community of families and researchers learning together [1][2]. Success in daily life comes from building a local team that is humble enough to collaborate with international experts and disciplined enough to monitor every affected organ system [3].

Your Multidisciplinary Care Team

Because HO-1 deficiency is a multisystem disease, you will need a roster of specialists who communicate with each other regularly [4]. (If transitioning to adulthood, these specialists must include adult care providers).

  • Hematologist: Manages the chronic anemia and monitors the “low bilirubin” hemolysis pattern [5].
  • Immunologist: Oversees the hyperinflammatory flares (MAS-like episodes) and infection prevention [4].
  • Pulmonologist: Monitors for interstitial lung disease and monitors lung function [4][5].
  • Nephrologist: Tracks kidney health and watches for signs of nephritis or protein buildup (amyloidosis) [1].
  • Medical Geneticist: Helps interpret the specific HMOX1 mutations and coordinates testing for other family members [4][6].

Daily Life with Asplenia

Many children with this condition have asplenia—meaning their spleen is either missing or not working correctly [4]. The spleen is the body’s primary filter for certain dangerous bacteria. Navigating daily life requires strict safety protocols:

  • The Fever Protocol: A fever can be a medical emergency. You should have a pre-written, signed “emergency letter” from your doctor that instructs the ER on your specific empiric antibiotic plan so emergency care is not delayed while waiting for test results [7][8].
  • Infection Prevention: Beyond standard hand hygiene, your child will need an intensive vaccine schedule (e.g., pneumococcus and meningococcus) depending on age and guidance [9][10]. Your team may also prescribe a daily low-dose antibiotic [11].
  • Exposure Awareness: While you want your child to live a full life, certain environments (like construction sites with mold spores or regions with high malaria/Babesia risk) warrant pre-counseling with your specialist [12][9].

Preparing for Specialist Visits

When meeting a new specialist, you are often the primary keeper of your child’s medical history. To ensure they have everything they need, bring the following physical artifacts:

  1. The Full Genetic Report: Not just a summary, but the complete sequencing report including the specific HMOX1 variants and the “segregation” (parental) testing results [4][6].
  2. Baseline Lab Values: A “quiet period” record of hemoglobin, ferritin, and fibrinogen levels. This helps doctors see when a flare is just beginning [5][6].
  3. Pathology Slides & Imaging: If your child has had a biopsy or MRI, the original slides (or high-resolution digital copies) can be sent for a “second opinion” by a pathologist familiar with iron-overload disorders [6][13].
  4. The Case Summary: A one-page timeline of your child’s major flares, hospitalizations, and response to previous treatments (like steroids or transfusions) [14].

Finding Global Support

Since your local doctor may never have seen another case, encourage them to use international data-sharing networks like Solve-RD (if eligible and active) or specialized rare disease registries [15][16]. These platforms allow doctors to pool data and consult with the few scientists worldwide who specialize in heme oxygenase research, ensuring your child benefits from the most current global knowledge [17][18].

Common questions in this guide

Which specialists should be involved in HO-1 deficiency care?
Care often involves a hematologist, immunologist, pulmonologist, nephrologist, and medical geneticist because HO-1 deficiency can affect blood, immune function, lungs, kidneys, and the spleen. These clinicians should share records and communicate regularly, with adult-care specialists added during transition.
What should we do if a child with HO-1 deficiency develops a fever?
If a child has asplenia or a poorly functioning spleen, fever may signal a serious infection and needs prompt medical evaluation. Ask the treating team for a signed emergency letter that states where to go and which empiric antibiotics the emergency department should consider without delaying care for test results.
How can families prepare for appointments with new specialists?
Bring the complete HMOX1 genetic report, including parental testing, baseline results from a well period, prior pathology or imaging, and a one-page timeline of flares, hospitalizations, and treatments. Keeping these records in a physical folder or secure digital file can help clinicians understand the child’s history.
How is infection risk managed when HO-1 deficiency includes asplenia?
The care team may recommend vaccines against bacteria such as pneumococcus and meningococcus, based on age and individual guidance. Some children may also be prescribed a daily low-dose antibiotic, and families should follow their clinician’s plan for urgent fever evaluation.
How can local doctors find expertise for this rare condition?
Local clinicians can ask international experts to review the case and may use rare-disease registries or data-sharing programs such as Solve-RD when eligible and active. These networks can help teams compare cases and connect with researchers who study heme oxygenase-1 deficiency.

Get notified when new evidence is published on Heme oxygenase-1 deficiency.

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References

References (18)
  1. 1

    Heme oxygenase-1 deficiency as an extremely rare cause of AA-type renal amyloidosis: Expanding the clinical features and review of the literature.

    Dirim AB, Kalayci T, Safak S, et al.

    Clinical rheumatology 2023; (42(2)):597-606 doi:10.1007/s10067-022-06465-9.

    PMID: 36502441
  2. 2

    Heme Oxygenase-1 Deficiency and Oxidative Stress: A Review of 9 Independent Human Cases and Animal Models.

    Yachie A

    International journal of molecular sciences 2021; (22(4)) doi:10.3390/ijms22041514.

    PMID: 33546372
  3. 3

    The Interdisciplinary Diagnosis of Rare Diseases.

    Rillig F, Grüters A, Schramm C, Krude H

    Deutsches Arzteblatt international 2022; (119(27-28)):469-475.

    PMID: 35635437
  4. 4

    Heme oxygenase-1 deficiency presenting with interstitial lung disease and hemophagocytic flares.

    Chau AS, Cole BL, Debley JS, et al.

    Pediatric rheumatology online journal 2020; (18(1)):80 doi:10.1186/s12969-020-00474-1.

    PMID: 33066778
  5. 5

    Clinical and molecular analysis of a novel variant in heme oxygenase-1 deficiency: Unraveling its role in inflammation, heme metabolism, and pulmonary phenotype.

    Berendes LS, Westhoff PS, Wittkowski H, et al.

    Molecular genetics and metabolism reports 2024; (38()):101038 doi:10.1016/j.ymgmr.2023.101038.

    PMID: 38178812
  6. 6

    Post-mortem Diagnosis of Heme Oxygenase-1 Deficiency by Whole Exome Sequencing in an Iranian Child.

    Tahghighi F, Parvaneh N, Ziaee V

    International journal of molecular and cellular medicine 2019; (8(4)):300-307 doi:10.22088/IJMCM.BUMS.8.4.300.

    PMID: 32587840
  7. 7

    [Impaired immunity: risk groups and consequences for general practice].

    Opstelten W, Bijlsma JW, Gelinck LB, et al.

    Nederlands tijdschrift voor geneeskunde 2016; (160()):A9752.

    PMID: 27299487
  8. 8

    Sporadic isolated congenital asplenia with fulminant pneumococcal meningitis: a case report and updated literature review.

    Iijima S

    BMC infectious diseases 2017; (17(1)):777 doi:10.1186/s12879-017-2896-5.

    PMID: 29254492
  9. 9

    Preventing infections in children and adults with asplenia.

    Lee GM

    Hematology. American Society of Hematology. Education Program 2020; (2020(1)):328-335 doi:10.1182/hematology.2020000117.

    PMID: 33275684
  10. 10

    Updated Recommendations on the Prevention and Treatment of Infections in Children With Asplenia/Hyposplenism.

    Guri A, Ben-Ami T

    Journal of pediatric hematology/oncology 2024; (46(5)):225-232 doi:10.1097/MPH.0000000000002855.

    PMID: 38691084
  11. 11

    Variability in the Management of Antibiotic Prophylaxis for Patients with Asplenia.

    Weakley KE, Dryer MM, Foley DS, et al.

    The Journal of pediatrics 2026; (294()):115091 doi:10.1016/j.jpeds.2026.115091.

    PMID: 41921772
  12. 12

    The development of a quality improvement project to improve infection prevention and management in patients with asplenia or hyposplenia.

    O'Neill NE, Baker J, Ward R, et al.

    BMJ open quality 2020; (9(3)) doi:10.1136/bmjoq-2019-000770.

    PMID: 32759171
  13. 13

    A national biobank framework for rare diseases: Standardized infrastructure and cross-institutional collaboration accelerating translational innovation in China.

    Liu W, Jin Y, Zhang Y, et al.

    HGG advances 2026; (7(1)):100544 doi:10.1016/j.xhgg.2025.100544.

    PMID: 41220173
  14. 14

    The International Working Group on Neurotransmitter related Disorders (iNTD): A worldwide research project focused on primary and secondary neurotransmitter disorders.

    Opladen T, Cortès-Saladelafont E, Mastrangelo M, et al.

    Molecular genetics and metabolism reports 2016; (9()):61-66 doi:10.1016/j.ymgmr.2016.09.006.

    PMID: 27830117
  15. 15

    Solve-RD: systematic pan-European data sharing and collaborative analysis to solve rare diseases.

    Zurek B, Ellwanger K, Vissers LELM, et al.

    European journal of human genetics : EJHG 2021; (29(9)):1325-1331 doi:10.1038/s41431-021-00859-0.

    PMID: 34075208
  16. 16

    Rare Disease Registries Are Key to Evidence-Based Personalized Medicine: Highlighting the European Experience.

    Kölker S, Gleich F, Mütze U, Opladen T

    Frontiers in endocrinology 2022; (13()):832063 doi:10.3389/fendo.2022.832063.

    PMID: 35317224
  17. 17

    U-IMD: the first Unified European registry for inherited metabolic diseases.

    Opladen T, Gleich F, Kozich V, et al.

    Orphanet journal of rare diseases 2021; (16(1)):95 doi:10.1186/s13023-021-01726-3.

    PMID: 33602304
  18. 18

    Regulatory strategies for rare diseases under current global regulatory statutes: a discussion with stakeholders.

    Mulberg AE, Bucci-Rechtweg C, Giuliano J, et al.

    Orphanet journal of rare diseases 2019; (14(1)):36 doi:10.1186/s13023-019-1017-5.

    PMID: 30736861

This page is for educational purposes and does not replace medical advice. Your child’s care team should create the individualized fever, infection-prevention, and specialist follow-up plan for your family.

Guide contents Heme oxygenase-1 deficiency
Research & Literature
05 Monitoring and Emergency Red Flags