A new family with spastic paraplegia type 51 and novel mutations in AP4E1.

Abstract

BACKGROUND:

Autosomal recessive mutations in the AP-4 (adaptor protein complex 4) complex subunit ϵ - 1 (AP-4E1) gene on chromosome 15q21.2 are known to cause spastic paraplegia 51 (SPG51). The exact phenotype of SPG51 remains poorly characterized, because only a few families have been reported as carriers of the mutation. In addition, a previous study identified an autosomal dominant mutation in the AP4E1 gene as being associated with persistent stuttering. The aim of the current study was to characterize the phenotype of a paediatric patient with an identified novel AP4E1 mutation presenting with significant psychomotor retardation, intellectual disability and paraplegia.

METHODS:

Magnetic resonance imaging was used to identify hypoplasia of the corpus callosum. The DNA sample was tested using multiplex ligation-dependent probe amplification (MLPA) and array comparative genomic hybridization (aCGH). In addition, next-generation sequencing (NGS) was performed using the patient's DNA, and Sanger sequencing was performed using that of his family members.

RESULTS:

The phenotype was identified to be associated with a novel pathogenic variant c.942_943 + 3delinsCC in the AP4E1 gene. The patient manifested severely delayed psychomotor development, impaired global physical development and general illness. Movement disorders were evident during the neonatal period.

CONCLUSIONS:

The present study identifies a previously unknown disease-inducing AP4E1 gene mutation.

• Authors: Izabela Winkler, Paweł Miotła, Monika Lejman, Aleksandra Pietrzyk, Magdalena Kacprzak, Marcin Kubiak, Agnieszka Sobczyńska-Tomaszewska, Maciej Skrzypczak, Ilona Jaszczuk
• Journal: BMC medical genomics (BMC Med Genomics) Vol. 14 Issue 1 Pg. 131 (05 18 2021) ISSN: 1755-8794 [Electronic] England
• PMID: 34006278 (Publication Type: Journal Article)

Topics

• Paraplegia