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Winged Helix Deficiency (FOXN1)

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Encyclopedia of Medical Immunology
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Synonyms

Alymphoid cystic thymic dysgenesis; FOXN1 deficiency; Nude SCID; Severe T cell immunodeficiency, congenital alopecia, nail dystrophy syndrome; Winged helix deficiency

Introduction/Background

FOXN1 encodes a transcription factor that is essential for the development of thymus and eccrine glands (Bonilla and Notarangelo 2015). This gene is a member of the forkhead gene family, which consists of a group of “winged helix” transcription factors that are involved in many aspects of cell development, metabolism, and aging (Palamaro et al. 2014). In fetal life, FOXN1 is expressed in mesenchymal and epithelial cells in the liver, lung, intestine, kidney, and urinary tract (Gallo et al. 2017). Postnatally, the gene is selectively expressed in thymic and skin epithelial cells (Palamaro et al. 2014).

The thymus is a primary lymphoid organ responsible for production of a diverse repertoire of immunocompetent T cells. FOXN1 is expressed in all thymic epithelial cells, which secrete...

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References

  • Bonilla F, Notarangelo L. Nathan and Oski’s hematology and oncology of infancy and childhood. 8th ed. Philadelphia: Elsevier; 2015.

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  • Gallo V, Cirillo E, Giardino G, Pignata C. FOXN1 deficiency: from the discovery to novel therapeutic approaches. J Clin Immunol. 2017;37(8):751–8.

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  • Palamaro L, Romano R, Fusco A, Giardino G, Gallo V, Pignata C. FOXN1 in organ development and human diseases. Int Rev Immunol. 2014;33(2):83–93.

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  • Romano R, Palamaro L, Fusco A, Iannace L, Maio S, Vigliano I, et al. From murine to human nude/SCID: the thymus, T-cell development and the missing link. Clin Dev Immunol. 2012;2012:467101.

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  • Rota IA, Dhalla F. FOXN1 deficient nude severe combined immunodeficiency. Orphanet J Rare Dis. 2017;12(1):6.

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Correspondence to Sonia Joychan .

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Joychan, S., Sriaroon, P. (2019). Winged Helix Deficiency (FOXN1). In: MacKay, I., Rose, N. (eds) Encyclopedia of Medical Immunology. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9209-2_175-1

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  • DOI: https://doi.org/10.1007/978-1-4614-9209-2_175-1

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  • Print ISBN: 978-1-4614-9209-2

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