A novel NPR2 mutation (p.Arg388Gln) in a patient with acromesomelic dysplasia, type maroteaux

Naoko Amano, Hiroshi Kitoh, Satoshi Narumi, Gen Nishimura, Tomonobu Hasegawa

研究成果: Article査読

抄録

Acromesomelic dysplasia, type Maroteaux (AMDM) is a congenital bone dysplasia characterized by disproportionate, acromesomelic shortening of the limbs and mild spondylar dysplasia. AMDM is caused by biallelic loss-of-function mutations in NPR2 encoding natriuretic peptide receptor-B. We report on a 25-yr-old Japanese woman with AMDM. Her height was 119.0 cm (–7.4 SD) and weight 35 kg (–2.3 SD). She had acromesomelic shortening of limbs and severe brachydactyly. Radiological examination showed that her metacarpals and phalanges were short and wide, and her vertebral bodies were mildly flattened. Molecular analysis revealed a novel homozygous NPR2 mutation (c.1163G>A, p.Arg388Gln). We performed in vitro functional studies using HA-tagged wild-type (WT) and Arg388Gln vectors (HA-WT-NPRB and HA-R388Q-NPRB). Cells expressing HA-R388Q-NPRB showed negligible cGMP responses to C-type natriuretic peptide (CNP) stimulation, indicating that the mutation led to severe loss-of-function. By immunofluorescence experiments under permeabilized conditions, HA-WT-NPRB was expressed on plasma membrane, while HA-R388Q-NPRB co-localized with an Endoplasmic Reticulum marker. Cells co-expressing R388Q and the WT exhibited lower responses under CNP treatment than cells co-expressing the WT and empty vectors. Thus, it was thought that R388Q caused a dominant-negative effect with a defect in cellular trafficking to the plasma membrane.

本文言語English
ページ(範囲)99-103
ページ数5
ジャーナルclinical pediatric endocrinology
29
3
DOI
出版ステータスPublished - 2020

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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