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Klaniewska M, Jedrzejowska M, Rydzanicz M, Paprocka J, Biela M, Wolanska E, Pollak A, Debek E, Sasiadek M, Ploski R, Gos M, Smigiel R. Case Report: Further Delineation of Neurological Symptoms in Young Children Caused by Compound Heterozygous Mutation in the PIEZO2 Gene. Front Genet 2021; 12:620752. [PMID: 33995476 PMCID: PMC8113815 DOI: 10.3389/fgene.2021.620752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 03/25/2021] [Indexed: 11/14/2022] Open
Abstract
PIEZO2 protein is a unique ion channel that converts mechanical impulses into cellular signals in somatosensory neurons and is involved in various mechanotransduction pathways. The recessive PIEZO2 loss-of-function pathogenic variants are associated with distal arthrogryposis with impaired proprioception and touch (DAIPT). Here we present three new DAIPT patients. The genetic diagnosis was established by exome sequencing and let us to identify 6 novel loss-of-function PIEZO2 variants: four splicing (c.1080+1G>A, c.4092+1G>T, c.6355+1G>T, and c.7613+1G>A), one nonsense (c.6088C>T) and one frameshift variant (c.6175_6191del) for which mosaic variant was identified in proband's mother. All patients presented typical symptoms at birth, with congenital contractures, bilateral hip dislocation/dysplasia, generalized hypotonia, transient feeding and difficulties. Two were afflicted by transient respiratory insufficiency. In all children motor development was severely delayed. In one patient, severe cognitive delay was also observed. Moreover, among the cases described by us there is the youngest diagnosed child to date.
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Affiliation(s)
- Magdalena Klaniewska
- Department of Pediatrics and Rare Disorders, Wroclaw Medical University, Wroclaw, Poland
| | - Maria Jedrzejowska
- Rare Diseases Research Platform, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | | | - Justyna Paprocka
- Department of Pediatric Neurology, Faculty of Medical Science, Medical University of Silesia, Katowice, Poland
| | - Mateusz Biela
- Department of Pediatrics and Rare Disorders, Wroclaw Medical University, Wroclaw, Poland
| | - Ewelina Wolanska
- Department of Pediatrics and Rare Disorders, Wroclaw Medical University, Wroclaw, Poland
| | - Agnieszka Pollak
- Rare Diseases Research Platform, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | - Emilia Debek
- Department of Medical Genetics, Institute of Mother and Child, Warsaw, Poland
| | - Maria Sasiadek
- Department of Genetics, Wroclaw Medical University, Wroclaw, Poland
| | - Rafal Ploski
- Department of Medical Genetics, Medical University of Warsaw, Warsaw, Poland
| | - Monika Gos
- Department of Medical Genetics, Institute of Mother and Child, Warsaw, Poland
| | - Robert Smigiel
- Department of Pediatrics and Rare Disorders, Wroclaw Medical University, Wroclaw, Poland
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