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Neurology, Aug 30 2023 | https://doi.org/10.1212/WNL.0000000000207832 Pearls & Oy-sters: Familial Verbal Auditory Agnosia Due to C9orf72 Repeat Expansion

Yoon Seob Kim¹, Young-Eun Kim², Yun-Hoon Choung, DDS, MD, PhD³, Hwajung Kim¹, Hee Jin Kim, MD, PhD⁴, Na-Yeon Jung⁵, Sun Min Lee¹, Eun-Joo Kim, MD⁶ and So Young Moon^1,a

¹Department of Neurology, Ajou University School of Medicine

²Department of Laboratory Medicine, Hanyang University College of Medicine

³Department of Otolaryngology, Ajou University School of Medicine

⁴Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine

⁵Department of Neurology, Pusan National University Yangsan Hospital, Research Institute for Convergence of Biomedical Science and Technology

⁶Department of Neurology, Pusan National University Hospital, Pusan National University School of Medicine and Medical Research Institute

^aCorresponding Author: So Young Moon

Abstract

Chromosome 9 open reading frame 72 ( C9orf72) gene mutations have been typically associated with frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS), but recent studies suggest their involvement in other disorders. This report describes a family with an autosomal dominant pattern of inheritance of progressive verbal auditory agnosia due to GGGGCC repeat expansion in C9orf72. A 60-year-old right-handed male truck driver presented with slowly progressive poor speech perception for 8 years, which became most troublesome when receiving verbal orders over the phone. He had difficulty recognizing single-syllable spoken words beyond his hearing loss, but had no problem understanding complex written language. He had a heterozygous pathogenic variant carrying 160 hexanucleotide repeats in the C9orf72 gene. His family history included his deceased mother with similar symptoms that had progressed over 30 years, as well as his older brother and youngest sister who experienced speech perception difficulty beginning in their early fifties. His asymptomatic younger brother had a heterozygous 2 repeat in the C9orf72 gene, while his symptomatic youngest sister had a heterozygous 159 repeat. The patient and his sister exhibited more pronounced cortical thinning in the frontotemporoparietal areas. The discrepancy observed between the distribution of atrophy and the presentation of symptoms in patients with C9orf72 pathogenic repeat expansion may be attributable to the slow progression of their clinical course over time. The variable symptom presentation of C9orf72 pathogenic repeat expansion highlights the importance of considering this mutation as a potential cause of autosomal dominant degenerative brain diseases beyond FTD and ALS.

논문정보

형식Research article
게재일2023년 08월 (BRIC 등록일 2023-09-12)
연구진국내 연구진
분야 의약학 > 신경의학

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