Haploinsufficiency for AAGAB causes clinically heterogeneous forms of punctate palmoplantar keratoderma.

Haploinsufficiency for AAGAB causes clinically heterogeneous forms of punctate palmoplantar keratoderma.
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DOI:
10.1038/ng.2444
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发表时间:
2012-11
期刊:
影响因子:
30.8
通讯作者:
McLean WH
McLean WH
中科院分区:
生物学1区
文献类型:
--
作者:
Pohler E;Mamai O;Hirst J;Zamiri M;Horn H;Nomura T;Irvine AD;Moran B;Wilson NJ;Smith FJ;Goh CS;Sandilands A;Cole C;Barton GJ;Evans AT;Shimizu H;Akiyama M;Suehiro M;Konohana I;Shboul M;Teissier S;Boussofara L;Denguezli M;Saad A;Gribaa M;Dopping-Hepenstal PJ;McGrath JA;Brown SJ;Goudie DR;Reversade B;Munro CS;McLean WH

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掌跖角化病 (PPK) 是一组在皮肤遗传学​​中诊断和治疗上存在问题的疾病。点状 PPK 的特点是手掌和足底出现局限性角化过度病变,且具有相当大的异质性。在 18 个患有常染色体显性点状 PPK (OMIM #148600) 的家族中,我们报告了 AAGAB 中的杂合功能丧失突变,编码 α- 和 γ- 适应素结合蛋白 p34,位于 15q22 上先前连锁的位点。 p34 是一种具有 Rab 样 GTP 酶结构域的胞质蛋白,显示可结合两种网格蛋白接头蛋白复合物,表明其在膜运输中的作用。在超微结构上,病变表皮显示细胞内囊泡生物学异常。免疫组织化学显示点状病变内过度增殖。角质形成细胞中 p34 的敲低导致细胞分裂增加,这与表皮生长因子受体 (EGFR) 蛋白表达和酪氨酸磷酸化大大增加有关。我们假设 p34 缺陷可能会损害生长因子受体(例如 EGFR)的内吞再循环,导致信号传导和增殖增加。
Palmoplantar keratodermas (PPKs) are a group of disorders that are diagnostically and therapeutically problematic in dermatogenetics. Punctate PPKs are characterized by circumscribed hyperkeratotic lesions on palms and soles with considerable heterogeneity. In 18 families with autosomal dominant punctate PPK (OMIM #148600), we report heterozygous loss-of-function mutations in AAGAB, encoding alpha- and gamma-adaptin binding protein p34, at a previously linked locus on 15q22. p34, a cytosolic protein with a Rab-like GTPase domain, was shown to bind both clathrin adaptor protein complexes, indicative of a role in membrane traffic. Ultrastucturally, lesional epidermis showed abnormalities in intracellular vesicle biology. Immunohistochemistry showed hyperproliferation within the punctate lesions. Knockdown of p34 in keratinocytes led to increased cell division, which was linked to greatly increased epidermal growth factor receptor (EGFR) protein expression and tyrosine phosphorylation. We hypothesize that p34 deficiency may impair endocytic recycling of growth factor receptors such as EGFR, leading to increased signaling and proliferation.
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