Abstract
Lysinuric protein intolerance (LPI) (MIM#222700) is a rare autosomal recessive defect in bibasic amino acid transport caused by pathogenic variants in solute carrier family 7 member 7 gene ( SLC7A7). The symptoms begin after weaning from breast milk and include refusal of feeding, vomiting, and consequent failure to thrive. Some metabolic disorders, including LPI, are complicated by hemophagocytic lymphohistiocytosis (HLH); however, the frequency of HLH caused by inborn errors of metabolism is very rare in the HLH cohort. SLC7A7 consists of 11 exons, and has 66 known pathogenic variants. SLC7A7 is associated with HLH. Here, we report the case of a 32-year-old woman who presented with LPI and HLH. Genetic analysis revealed a novel compound heterozygosity in SLC7A7 with two pathogenic variants, c.713C>T (p. Sre238Phe) and c.625+1G>A (splicing acceptor site) inherited from her father and mother, respectively.
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Abbreviations
- LPI:
-
Lysinuric protein intolerance
- SLC7A7 :
-
Solute carrier family 7 member 7 gene
- y+L AT-1:
-
Y+L amino acid transporter-1
- HLH:
-
Hemophagocytic lymphohistiocytosis
- HGMD:
-
Human genome database
- IEM:
-
Inborn errors of metabolism
- EBV:
-
Epstein–Barr virus
- VCA:
-
Viral capsid antigen
- ANA:
-
Antinuclear antibody
- SS:
-
Sjögren syndrome
- HbA1c :
-
Hemoglobin A1c
- anti-dsDNA:
-
Anti-double stranded DNA
- SLE:
-
Systemic lupus erythematosus
- COG6:
-
Component of oligomeric Golgi complex 6
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Acknowledgements
The authors would like to thank Drs. Mamiko Yamada, Hisato Suzuki, and Toshiki Takeuchi (Center of Medical Genetics, Keio University School of Medicine) for patient genetic analysis. We also thank all the medical staff of Shiga University of Medical Science involved in the treatment of this patient.
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YM. and KS. collected and interpreted the data and wrote the manuscript; TT. and YM. designed the study, interpreted the data, wrote the manuscript, and provided medical care for this patient; KK. evaluated the patient and collected data. All authors discussed the results and critically reviewed the manuscript.
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Matsukawa, Y., Sakamoto, K., Ikeda, Y. et al. Familial hemophagocytic lymphohistiocytosis syndrome due to lysinuric protein intolerance: a patient with a novel compound heterozygous pathogenic variant in SLC7A7. Int J Hematol 116, 635–638 (2022). https://doi.org/10.1007/s12185-022-03375-z
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DOI: https://doi.org/10.1007/s12185-022-03375-z