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Food Allergy in a Child with De Novo KAT6A Mutation Varpu Elenius1*, Tuire Lähdesmäki2, Marja Hietala3 and Tuomas Jartti1

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Food Allergy in a Child with De Novo KAT6A Mutation Varpu Elenius1*, Tuire Lähdesmäki2, Marja Hietala3 and Tuomas Jartti1 Elenius et al. Clin Transl Allergy (2017) 7:19 DOI 10.1186/s13601-017-0155-x Clinical and Translational Allergy LETTER TO THE EDITOR Open Access Food allergy in a child with de novo KAT6A mutation Varpu Elenius1*, Tuire Lähdesmäki2, Marja Hietala3 and Tuomas Jartti1 Abstract Crying combined with miscellaneous gastrointestinal symptoms are typical symptoms of infant with food allergy, but are also common among children with abnormal neurological development. Mutations in KAT6A gene is known to cause a syndrome characterized by developmental delay, hypotonia, cardiac defects, microcephaly, specifc facial features and early feeding problems. However, these feeding problems have not earlier been specifed. We present the frst reported case of a DBPCFC confrmed food allergy in a child with KAT6A mutation whose feeding problems resolved with elimination diet. The present case does not establish proof of cause, but highlights the importance of careful clinical diagnostics despite other possible causes for feeding problems. Recognizing that early feeding prob‑ lems these patients regularly have might be caused by food allergy is important for outcome and quality of life for these patients. Keywords: Feeding problems, Food allergy, Histone acetylation, KAT6A mutation To the editor Case study Adverse reactions to food are a major clinical problem. Te patient was born at 39 weeks to non-consanquine- Te dermatologic and systemic reactions to food are well ous parents after uncomplicated pregnancy with normal recognized but reactions manifesting primarily in the maternal serum screening and ultrasounds. At birth, digestive tract can be difcult to recognize, diagnose and weight was 3.0 kg normal, length 46 cm (Z = −2.4) treat [1]. Most gastrointestinal symptoms are non-IgE and occipital-frontal circumference (OFC) 33.5 cm mediated [1]. Te skin prick test or specifc IgE alone are (Z = −1.0). At the age of 2 months, she was admitted not helpful. Double blind, placebo-controlled food chal- to pediatric hospital due to poor eye contact. Te oph- lenge (DBPCFC) is the gold standard for diagnosing food thalmologic examination showed only intermittent allergy in these patients. esothropia. Further clinical examination showed dysmor- Crying combined with miscellaneous gastrointesti- phic features (microcephaly, thin upper lip, broad nasal nal symptoms are typical symptoms of infant with food bridge, large forehead, low set ears, epicanthal folds) allergy. Crying, vomiting and stomach pain combined (Fig. 1), global developmental delay and asymptomatic by feeding problems are also common symptoms among atrial septal defect and patent ductus arteriosus. Chronic children with abnormal neurological development. Tese ear infections required tympanic tube placement at age symptoms may be due to child’s muscle hypotonia, oral of 20 months and atrial septal defect was repaired at age dyspraxia, aerophagia and obstipation. We present a case of 23 months. Te achievement of motor milestones was to outline the importance of careful clinical diagnostics markedly delayed; sitting without support was achieved in case of infant food allergy, despite of other possible at 16 months and supported standing at 2 years. No causes for feeding problems. verbal communication was achieved at 2 years. Reha- bilitation with physical and speech therapy was initiated during her frst year. Brain 3T-magnetic resonance imag- *Correspondence: [email protected] ing and metabolic screening were normal. 1 Department of Pediatrics, Turku University Hospital, Kiinamyllynkatu 4‑8, Te child was breast-fed until 12 months of age, but 20520 Turku, Finland Full list of author information is available at the end of the article additional standard formula was given from 4 months of © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/ publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Elenius et al. Clin Transl Allergy (2017) 7:19 Page 2 of 3 Fig. 1 Facial characteristics of the child with KAT6A mutation. Characteristic features of this syndrome, e.g. bitemoporal narrowing, broad nasal tip, low set ears, thin upper lip, micrognatia and smooth fltrum are seen age. Feeding problems originated at the age of 1 month Rostock, Germany, a commercial laboratory ofering while recieving only breast milk. Mother noticed that WES as a diagnostic service. First, exons were enriched child developed gastrointestinal symptoms (vomiting and from fragmented genomic DNA and then the sample was diarrhea) if mother had consumed milk or wheat. Symp- processed on the NextSeq Platform (Illumina, San Diego, toms got worse after solids were introduced to diet at California, USA). A previously unreported heterozy- age of 6 months. After milk ingestion child had vomiting gous variant was detected in exon 17 of the KAT6A gene, and diarrhea. Wheat ingestion caused vomiting, discom- c.3655del (p.Leu1219Tyrfs*). Te identifed variant was fort and obstipation. All symptoms resolved with elimi- confrmed by Sanger sequencing. Tis deletion creates nation diet. At age of 15 months specifc-IgE for milk, a frame shift and the new reading frame ends in a stop wheat, soy, peanut and cod were negative. Terefore, codon 74 positions downstream. Tis variant was absent DBPCFC with milk and wheat was performed. DBPCFC in the parents. test confrmed wheat and milk protein allergy. Te child had vomiting, discomfort and obstipation during double Discussion blind wheat challenge test, and vomiting and diarrhea KAT6A, also known as MOZ or MYST3, is a lysine (K) during double blind milk challenge test. With the elimi- acetyltransferase that is located on chromosome 8p11.2. nation of wheat and milk protein her feeding problems It was frst found as a fusion protein in patients with and gastrointestinal symptoms resolved. At 2 of years old, acute myelogenous leukemia [3]. In humans, KAT6A is her OFC was less than third percentile for age but weight expressed in 49 diferent tissues including brain, heart and length increased appropriately with elimination diet. and intestine. Te protein forms a part of a histone Te patient was referred to clinical geneticist. Many acetyltransferase complex that acetylates lysine-9 resi- of the features exhibited in this child exist in some well- dues in histone H3 (H3K9). Acetylated H3K9 is associ- characterized genetic syndromes like Down, Rett and ated with transcriptionally active genes, whereas histone genitopatellar syndromes, but genetic testing for these deacetylation is associated with gene silencing. Tus, syndromes were normal. In order to understand the KAT6A has important roles in gene-specifc histone 3 molecular mechanisms underlying the phenotype of this acetylation, regulating developmental gene expression child, DNA was isolated from peripheral blood by stand- and controlling a wide range of processes such as cell ard procedures and whole exome sequencing (WES) was mobility, metabolism, DNA replication and repair. performed [2]. Parents provided written informed con- A year ago, mutations in KAT6A was shown to cause sent for WES, and parents own DNA was isolated for a syndrome characterized by developmental delay, hypo- comparison. DNA samples from the family were sent tonia, early feeding problems, cardiac defects, micro- to whole exome sequencing at Centogene laboratory, cephaly and specifc facial features such as broad nasal Elenius et al. Clin Transl Allergy (2017) 7:19 Page 3 of 3 3 tip, bitemporal narrowing, thin upper lip, low set ears Hospital, Kiinamyllynkatu 4‑8, 20520 Turku, Finland. Department of Genetics, Turku University Hospital, Kiinamyllynkatu 4‑8, 20520 Turku, Finland. [4, 5]. All of these features were found in our patient (Fig. 1). Previous studies have also reported non-spe- Acknowledgements cifc feeding problems. Arbodel et al. [4] reported that We thank the family for participating in this case report. 3/4 patients had feeding problems and 2/4 had refux. Competing interests In the study of Tam et al. [5] 5/7 had feeding problems The authors declare that they have no competing interests. requiring nasogastric tube or gastrostomy. We contacted Availability of data and materials the authors of these reports, but in many cases these The data are in the patient fles. patients were never tested for food allergies. In Arbodel’s study group at least 2/4 patients had been later diag- Ethics approval and consent to participate and publication It is a case report therefore no Ethics approval was obtained. Written consent nosed with food allergy. Te existence of food allergy in was obtained from the caregivers of the patient to publish the case. these patients may be coincidental and further research is needed to confrm this possible link. Biased immune Publisher’s Note events can be expected since KAT6A has frequently been Springer Nature remains neutral with regard to jurisdictional claims in pub‑ associated with a failure to maintain a normal number of lished maps and institutional afliations. haematopoietic precursors suggesting a specifc role of Received: 11 January 2017 Accepted: 30 May 2017 KAT6A-driven
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