PMID- 37987248 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20231123 IS - 2073-4468 (Electronic) IS - 2073-4468 (Linking) VI - 12 IP - 4 DP - 2023 Nov 3 TI - Elevated IgE Levels-An Allergy or an Underlying Inborn Error of Immunity in Children with Recurrent Infections? LID - 10.3390/antib12040070 [doi] LID - 70 AB - Elevated immunoglobulin E (IgE) is a hallmark of allergic diseases. However, high IgE levels also occur in a number of other infectious and noninfectious diseases. In most cases, elevated IgE levels indicate allergy, eczema, or chronic skin infection. Very high IgE levels are not uncommon in patients with active eczema but more often indicate monogenic atopic disorder or inborn errors of immunity with an atopic phenotype. We conducted a retrospective study of 385 children with suspected immune deficiency referred to the clinic over a 9-year period. Measurement of IgE, IgG, IgA, IgM, and IgG subclasses in blood samples revealed that nearly one-third of the patients had elevated serum IgE levels. Most of the cases with elevated IgE were children with underlying atopy-mainly atopic dermatitis and, to a lesser extent, bronchial asthma-whereas 40.12% (37 children) had no atopy at all. In the most severe cases (with extremely elevated IgE or severe dermatitis), we confirmed genetic mutations for underlying immunodeficiency. Our results indicate that allergic phenotype should not be underestimated and that children with more severe allergic disease should be evaluated for an underlying inborn error of immunity. If inborn error of immunity (IEI) is suspected, a comprehensive immunologic evaluation is required. Genetic testing helps identify the specific genetic abnormality, which provides important insight into the immunopathogenesis of the disease and accurate determination of optimal therapy. FAU - Kostova, Polina AU - Kostova P AUID- ORCID: 0000-0002-3012-1861 AD - Pediatric Department, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Pediatric Clinic, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Papochieva, Vera AU - Papochieva V AD - Pediatric Clinic, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Miteva, Dimitrinka AU - Miteva D AD - Pediatric Department, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Pediatric Clinic, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Georgieva, Bilyana AU - Georgieva B AD - Pediatric Department, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Pediatric Clinic, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Mileva, Sirma AU - Mileva S AD - Pediatric Department, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Pediatric Clinic, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Shahid, Martin AU - Shahid M AUID- ORCID: 0000-0002-7669-1368 AD - Department of Dermatology and Venereology, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Dermatology Clinic UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Lukanov, Tsvetelin AU - Lukanov T AD - Department of Clinical Immunology with Stem Cell Bank, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Clinic of Immunology, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. FAU - Petrova, Guergana AU - Petrova G AUID- ORCID: 0000-0001-8168-742X AD - Pediatric Department, Medical University Sofia, 2 Zdrave Str., 1431 Sofia, Bulgaria. AD - Pediatric Clinic, UMHAT Alexandrovska, 1 Georgi Sofiyski Str., 1431 Sofia, Bulgaria. LA - eng GR - 170/2022/Medical University of Sofia (Council of Medical Science, project no. 7343/2021)/ PT - Journal Article DEP - 20231103 PL - Switzerland TA - Antibodies (Basel) JT - Antibodies (Basel, Switzerland) JID - 101587489 PMC - PMC10660463 OTO - NOTNLM OT - allergic diseases OT - immunoglobulin E OT - inborn errors of immunity COIS- The authors declare no conflict of interest. EDAT- 2023/11/21 12:44 MHDA- 2023/11/21 12:45 PMCR- 2023/11/03 CRDT- 2023/11/21 06:26 PHST- 2023/08/31 00:00 [received] PHST- 2023/10/20 00:00 [revised] PHST- 2023/10/31 00:00 [accepted] PHST- 2023/11/21 12:45 [medline] PHST- 2023/11/21 12:44 [pubmed] PHST- 2023/11/21 06:26 [entrez] PHST- 2023/11/03 00:00 [pmc-release] AID - antib12040070 [pii] AID - antibodies-12-00070 [pii] AID - 10.3390/antib12040070 [doi] PST - epublish SO - Antibodies (Basel). 2023 Nov 3;12(4):70. doi: 10.3390/antib12040070.