Loss-of-function mutations of CHST14 in a new type of Ehlers-Danlos syndrome

Noriko Miyake, Tomoki Kosho, Shuji Mizumoto, Tatsuya Furuichi, Atsushi Hatamochi, Yoji Nagashima, Eiichi Arai, Kazuo Takahashi, Rie Kawamura, Keiko Wakui, Jun Takahashi, Hiroyuki Kato, Hiroshi Yasui, Tadao Ishida, Hirofumi Ohashi, Gen Nishimura, Masaaki Shiina, Hirotomo Saitsu, Yoshinori Tsurusaki, Hiroshi DoiYoshimitsu Fukushima, Shiro Ikegawa, Shuhei Yamada, Kazuyuki Sugahara, Naomichi Matsumoto

研究成果: Article査読

98 被引用数 (Scopus)

抄録

Ehlers-Danlos syndrome (EDS) is a heterogeneous connective tissue disorder involving skin and joint laxity and tissue fragility. A new type of EDS, similar to kyphoscoliosis type but without lysyl hydroxylase deficiency, has been investigated. We have identified a homozygous CHST14 (carbohydrate sulfotransferase 14) mutation in the two familial cases and compound heterozygous mutations in four sporadic cases. CHST14 encodes dermatan 4-O-sulfotransferase 1 (D4ST1), which transfers active sulfate from 3′-phosphoadenosine 5′-phosphosulfate to position 4 of the N-acetyl-Dgalactosamine (GalNAc) residues of dermatan sulfate (DS). Transfection experiments of mutants and enzyme assays using fibroblast lysates of patients showed the loss of D4ST1 activity. CHST14 mutations altered the glycosaminoglycan (GAG) components in patients' fibroblasts. Interestingly, DS of decorin proteoglycan, a key regulator of collagen fibril assembly, was completely lost and replaced by chondroitin sulfate (CS) in the patients' fibroblasts, leading to decreased flexibility of GAG chains. The loss of the decorin DS proteoglycan due to CHST14 mutations may preclude proper collagen bundle formation or maintenance of collagen bundles while the sizes and shapes of collagen fibrils are unchanged as observed in the patients' dermal tissues. These findings indicate the important role of decorin DS in the extracellular matrix and a novel pathomechanism in EDS.

本文言語English
ページ(範囲)966-974
ページ数9
ジャーナルHuman Mutation
31
8
DOI
出版ステータスPublished - 08-2010
外部発表はい

All Science Journal Classification (ASJC) codes

  • 遺伝学
  • 遺伝学(臨床)

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