Journals / Pediatric Practice and Research / 2026 / Volume: 14 Issue: 1

TRACK Syndrome Caused by Homozygous TSEN2 c.1100-5T>A Variant Presenting with Atypical Hemolytic Uremic Syndrome and Early End-Stage Kidney Disease

Atipik Hemolitik Üremik Sendrom ve Erken Dönem Son Dönem Böbrek Yetmezliği ile Prezente Olan Homozigot TSEN2 c.1100-5T>A Varyantına Bağlı TRACK Sendromu

Aslı Kantar(UNIVERSITY OF HEALTH SCIENCES, İZMİR TEPECİK HEALTH RESEARCH CENTER)0000-0003-4630-4790
Duygu Güllü(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İZMİR DR. BEHÇET UZ ÇOCUK HASTALIKLARI VE CERRAHİSİ SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ)0009-0006-8385-7174
Yakup Yaman(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0009-0001-9493-4650
Betül Pehlivan Zorlu(Department of Pediatric Nephrology, Ankara Bilkent City Hospital, Ankara, Turkey)0000-0003-3349-4257
Derya Özmen(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0000-0002-7651-1574
Fatma Devrim(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0000-0001-9564-0489
Şükran Keskin Gözmen(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0000-0001-5052-1902
Filiz Hazan(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0000-0002-0382-3446
Aycan Ünalp(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0000-0002-3611-5059
Nida Dinçel(UNIVERSITY OF HEALTH SCIENCES, İZMİR DR. BEHÇET UZ HEALTH RESEARCH CENTER FOR PEDIATRIC DISEASES AND SURGERY)0000-0002-1179-8519
Pages
—
Publication Date
2026-06-29
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Conclusion: This report highlights a rare cause of aHUS and end-stage kidney disease (ESKD) due to a TSEN2 splice-site mutation, further expanding the phenotypic spectrum of TRACK syndrome.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Background: TRACK syndrome, first described by Canpolat et al., is a rare disorder caused by splice-site mutations in TSEN2, characterized by craniofacial malformations, central nervous system (CNS) anomalies, progressive kidney disease.
📊
Key Findings & Data:Case Presentation: We present a 2.5-year-old boy, third child of consanguineous parents, admitted with fever and cough, diagnosed with atypical hemolytic uremic syndrome (aHUS).
💡
Conclusion & Impact:Conclusion: This report highlights a rare cause of aHUS and end-stage kidney disease (ESKD) due to a TSEN2 splice-site mutation, further expanding the phenotypic spectrum of TRACK syndrome.
🔬Design:Case Report
📍Scope:Comprehensive Sample
⚙️Variables:TSEN · aHUS · TRACK syndrome

Abstract

Background: TRACK syndrome, first described by Canpolat et al., is a rare disorder caused by splice-site mutations in TSEN2, characterized by craniofacial malformations, central nervous system (CNS) anomalies, progressive kidney disease. Case Presentation: We present a 2.5-year-old boy, third child of consanguineous parents, admitted with fever and cough, diagnosed with atypical hemolytic uremic syndrome (aHUS). Whole exome sequencing revealed a homozygous intronic TSEN2 variant (c.1100-5T>A), consistent with TRACK syndrome. Two deceased siblings had similar dysmorphic features and early-onset renal failure. The proband exhibited microcephaly, craniofacial dysmorphism, left atrial dilation, and laboratory findings consistent with thrombotic microangiopathy (TMA). Despite pathogenic TSEN2 variant, he’d normal intellectual and motor development. He’s currently 6 years old, undergoing peritoneal dialysis, receiving biweekly eculizumab, and antiepileptic therapy. Conclusion: This report highlights a rare cause of aHUS and end-stage kidney disease (ESKD) due to a TSEN2 splice-site mutation, further expanding the phenotypic spectrum of TRACK syndrome.

Özet

Giriş: Canpolat ve arkadaşları tarafından ilk kez tanımlanan TRACK sendromu, TSEN2 genindeki ekzon–intron birleşim bölgesi (splice-site) mutasyonlarının neden olduğu, kraniyofasiyal anomaliler, merkezi sinir sistemi (MSS) bozuklukları ve progresif böbrek hastalığı ile karakterize nadir bir bozukluktur. Olgu Sunumu: Akraba evliliği olan ebeveynlerin üçüncü çocuğu olan 2,5 yaşındaki erkek hasta, ateş ve öksürük yakınmalarıyla başvurdu ve atipik hemolitik üremik sendrom (aHUS) tanısı aldı. Tüm ekzom dizileme analizinde, TRACK sendromu ile uyumlu homozigot intronik TSEN2 varyantı (c.1100-5T>A) saptandı. Daha önce ölen iki kardeşte de benzer dismorfik özellikler ve erken başlangıçlı böbrek yetmezliği öyküsü mevcuttu. Olguda mikrosefali, kraniyofasiyal dismorfizm, sol atriyal dilatasyon ve trombotik mikroanjiyopati (TMA) ile uyumlu laboratuvar bulguları gözlendi. Patolojik TSEN2 varyantına rağmen hastanın entelektüel ve motor gelişimi normaldi. Hasta şu anda 6 yaşında olup periton diyalizi almakta, iki haftada bir eculizumab tedavisi uygulanmakta ve antiepileptik tedavi sürmektedir. Sonuç: Bu olgu, TSEN2 splice-site mutasyonuna bağlı gelişen aHUS ve son dönem böbrek yetmezliğinin nadir bir nedeni olarak TRACK sendromuna dikkat çekmekte ve sendromun fenotipik spektrumunu genişletmektedir.

🔖

Cite This Article

Kantar, A., Güllü, D., Yaman, Y., Zorlu, B. P., Özmen, D., Devrim, F., Gözmen, Ş. K., Hazan, F., Ünalp, A., Dinçel, N. (2026). TRACK Syndrome Caused by Homozygous TSEN2 c.1100-5T>A Variant Presenting with Atypical Hemolytic Uremic Syndrome and Early End-Stage Kidney Disease. Pediatric Practice and Research, Volume: 14 Issue: 1. https://doi.org/10.21765/pprjournal.1833482

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (4)

  1. Canpolat N, Liu D, Atayar E, et al. A splice site mutation in the TSEN2 causes a new syndrome with craniofacial and central nervous system malformations, and atypical hemolytic uremic syndrome. Clin Genet. 2022;101(3):346–58.
  2. Namavar Y, Barth PG, Kasher PR, et al. Clinical, neuroradiological and genetic findings in pontocerebellar hypoplasia. Brain. 2011;134(Pt 1):143–56.
  3. Paushkin SV, Patel M, Furia BS, Peltz SW, Trotta CR. Identification of a human endonuclease complex reveals a link between tRNA splicing and pre-mRNA 3' end formation. Cell. 2004;117(3):311–21.
  4. Durak C, Sahin EG, Yusuf Can Y, Varol F, Cam H. Why has plasma exchange failed in TRACK syndrome? Lessons from a new variant of the atypical hemolytic uremic syndrome. J Clin Apher. 2023;38(5):647–50.