Clinical phenotype of hereditary spastic paraplegia due to KIF1C gene mutations across life span

Publication date: Available online 12 March 2018
Source:Brain and Development
Author(s): Didem Yücel-Yılmaz, Emrah Yücesan, Dilek Yalnızoğlu, Kader Karlı Oğuz, Mahmut Şamil Sağıroğlu, Uğur Özbek, Esra Serdaroğlu, Başar Bilgiç, Sevim Erdem, Sibel Aylin Uğur İşeri, Haşmet Hanağası, Hakan Gürvit, Rıza Köksal Özgül, Ali Dursun
Hereditary spastic paraplegias (HSPs) are a group of genetic disorders resulting in pyramidal tract impairment, predominantly in lower limbs. KIF1C gene has recently been identified as one of the genetic causes of HSP and associated with pure or complicated HSP. We present three patients with complicated HSP from two unrelated families, who had early onset progressive cerebellar signs and developed pyramidal tract signs during follow-up. Whole exome sequencing in these patients followed by segregation analysis identified novel truncating KIF1C mutations (c.463C> T; p.R155^∗ and c.2478delA; p.Ala828Argfs^∗13). Neuroimaging findings showed cerebral and upper cervical spinal atrophy, bilateral symmetrical pyramidal tract involvement, and focal cerebral white matter lesions. Patients with KIF1C mutations may present with cerebellar signs and pyramidal findings may emerge later, therefore complicated HSP should be considered in the differential diagnosis of unidentified cases with cerebellar dysfunction.



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