Hemorrhagic shock and encephalopathy syndrome in a patient with a de novo heterozygous variant in KIF1A

Kouji Isobe, Daisuke Ieda, Fuyuki Miya, Rieko Miyachi, Shiomi Otsuji, Masami Asai, Tatsuhiko Tsunoda, Kenjiro Kosaki, Ayako Hattori, Shinji Saitoh, Mihoko Mizuno

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Introduction: KIF1A, a gene that encodes a neuron-specific motor protein, plays important roles in cargo transport along neurites. Variants in KIF1A have been described in three different disorders, and neurodegeneration and spasticity with or without cerebellar atrophy or cortical visual impairment syndrome (NESCAVS) is the severest phenotype. Case report: A 3-year-old girl was born at term with a birth weight of 2590 g. At five months of age, she visited our hospital due to developmental delay. An EEG showed multiple epileptic discharge, and a nerve conduction study showed severe axonopathy of both motor and sensory nerves. We performed exome sequencing and identified a de novo heterozygous missense variant in KIF1A (NM_001244008.1: c. 757G > A, p.E253K). At six months of age, she developed acute encephalopathy, multiple organ failure and disseminated intravascular coagulation, necessitating intensive care. Her brain CT showed severe brain edema, followed by profound brain atrophy. We diagnosed hemorrhagic shock and encephalopathy syndrome (HSES) according to the clinico-radiological features. Currently, she is bed-ridden, and requires gastrostomy because of dysphagia. Conclusion: The clinical course of our case confirmed that p.E253K is associated with severe neurological features. Severe KIF1A deficiency could cause thermoregulatory dysfunction and may increase the risk of acute encephalopathy including HSES.

Original languageEnglish
Pages (from-to)249-253
Number of pages5
JournalBrain and Development
Issue number3
Publication statusPublished - 2022 Mar


  • Acute encephalopathy (AE)
  • DIC
  • Motor domain
  • NESCAV syndrome
  • PEHO syndrome
  • Peripheral neuropathy
  • Spastic paraparesis

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Developmental Neuroscience
  • Clinical Neurology


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