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Gram SB, Jørgensen ASF, Bygum A, Brusgaard K, Ousager LB. Identification of a founder variant AAGAB c.370C>T, p.Arg124Ter in patients with punctate palmoplantar keratoderma in Southern Denmark. Clin Genet 2024; 105:561-566. [PMID: 38311882 DOI: 10.1111/cge.14486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/19/2023] [Accepted: 01/05/2024] [Indexed: 02/06/2024]
Abstract
Palmoplantar keratoderma (PPK) is a heterogeneous group of rare skin diseases characterized by hyperkeratosis on the palms or soles. The subtype isolated punctate PPK is caused by heterozygous variants in AAGAB. We investigated if the variant AAGAB c.370C>T, p.Arg124Ter in patients with punctate PPK in the Region of Southern Denmark represented a founder variant and estimated the age to the most recent common ancestor. We performed haplotype analysis on samples from 20 patients diagnosed with punctate PPK and the AAGAB c.370C>T, p.Arg124Ter variant. Using the Gamma Method, we calculated the years to the most recent common ancestor. We also explored the presence of the variant in other populations through literature and databases (HGMD, ClinVar, and gnomAD). Our analysis revealed a shared haplotype of 3.0 Mb, suggesting shared ancestry. The ancestral haplogroup was estimated to an age of 12.1 generations (CI: 4.9-20.3) equivalent to approximately 339 years (CI: 137-568). This study confirms that the frequently observed variant AAGAB c.370C>T, p.Arg124Ter in punctate PPK among patients in the Region of Southern Denmark is caused by a founder variant. We recommend testing for the variant as initial screening in our region and potentially for all Danish patients presenting with punctate PPK.
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Affiliation(s)
- Stine Bjørn Gram
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- European Reference Network for Rare Skin Diseases (ERN-Skin), Odense, Denmark
| | | | - Anette Bygum
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- Hudklinikken Kolding, Kolding, Denmark
| | - Klaus Brusgaard
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Lilian Bomme Ousager
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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Gram SB, Bjerrelund J, Jelsig AM, Bygum A, Leboeuf-Yde C, Ousager LB. Is punctate palmoplantar keratoderma type 1 associated with malignancy? A systematic review of the literature. Orphanet J Rare Dis 2023; 18:290. [PMID: 37705065 PMCID: PMC10500882 DOI: 10.1186/s13023-023-02862-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 08/20/2023] [Indexed: 09/15/2023] Open
Abstract
BACKGROUND An association between punctate palmoplantar keratoderma type 1 (PPPK1) and malignancy has been proposed for decades. Some authors suggest that individuals with PPPK1 should undergo screening for various types of malignancies while others caution that an association is not well-established. In this systematic review, we summarized and evaluated the current evidence for a possible association between PPPK1 and malignancy. METHODS The review was conducted along PRISMA guidelines. The search used Embase, MEDLINE, Scopus, and the Human Gene Mutation Database up to March 2022. All studies reporting on individuals with the diagnosis of PPPK1 with or without history of malignancy were included. Two authors screened for eligible studies, extracted predefined data, and performed a quality assessment. RESULTS Of 773 studies identified, 45 were included. Most studies were reports on single families (24 of 45 studies) or multiple families (10 of 45 studies). The number of index cases with PPPK1 across all included studies was 280, and when family members reported with PPPK1 were added, a total of 817 individuals were identified. Overall, 23 studies reported on individuals with PPPK1 with a history of malignancy, whereas 22 studies reported on individuals with PPPK1 without a history of malignancy. Although the extracted data were not considered to be of sufficient quality to synthesize and answer our research question, the review did not confirm an association between PPPK1 and malignancy. CONCLUSION This review shows that there is a lack of well-designed studies on this topic to conclude whether individuals with PPPK1 have an increased risk of malignancy. Based on the present literature, however, we could not confirm an association between PPPK1 and malignancy and find it highly questionable if patients with PPPK1 should be offered surveillance for malignancies.
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Affiliation(s)
- S B Gram
- Department of Clinical Genetics, Odense University Hospital, J.B. Winsløws Vej 4, Indgang 24, 5000, Odense C, Denmark.
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
| | - J Bjerrelund
- Department of Clinical Genetics, Odense University Hospital, J.B. Winsløws Vej 4, Indgang 24, 5000, Odense C, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - A M Jelsig
- Department of Clinical Genetics, Copenhagen University Hospital, Copenhagen, Denmark
| | - A Bygum
- Department of Clinical Genetics, Odense University Hospital, J.B. Winsløws Vej 4, Indgang 24, 5000, Odense C, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- Hudklinikken Kolding, Kolding, Denmark
| | - C Leboeuf-Yde
- Institute for Regional Health Research, University of Southern Denmark, Odense, Denmark
| | - L B Ousager
- Department of Clinical Genetics, Odense University Hospital, J.B. Winsløws Vej 4, Indgang 24, 5000, Odense C, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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Abstract
Clathrin-coated vesicles mediate membrane cargo transportation from the plasma membrane, the trans-Golgi network, the endosome, and the lysosome. Heterotetrameric adaptor complexes 1 and 2 (AP1 and AP2) are bridges that link cargo-loaded membranes to clathrin coats. Assembly of AP2 was previously considered to be spontaneous; however, a recent study found AP2 assembly is a highly orchestrated process controlled by alpha and gamma adaptin binding protein (AAGAB). Evidence shows that AAGAB controls AP1 assembly in a similar way. Insights into the orchestrated assembly process and three-dimensional structures of assembly intermediates are only emerging. Here, we describe a protocol for reconstitution and purification of the complexes containing AAGAB and AP1 or AP2 subunits, known as AP1 and AP2 hemicomplexes. Our purification routinely yields milligrams of pure complexes suitable for structural analysis by X-ray crystallography and electron microscopy.
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Affiliation(s)
- Bing Wang
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - Rui Yang
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - Yuan Tian
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - Qian Yin
- Department of Biological Science, Florida State University, Tallahassee, FL, USA.
- Institute of Molecular Biophysics, Florida State University, Tallahassee, FL, USA.
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Wang S, Wan C, Squiers GT, Shen J. Endocytosis Assays Using Cleavable Fluorescent Dyes. Methods Mol Biol 2022; 2473:181-194. [PMID: 35819767 DOI: 10.1007/978-1-0716-2209-4_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Endocytosis mediates the entry of surface and extracellular cargoes into the cell. In this chapter, we describe assays to quantitively measure the endocytosis of both soluble and transmembrane cargo proteins, taking advantage of cleavable fluorescent dyes labeling cargo proteins or antibodies recognizing cargo proteins. After removing surface-bound fluorescent dye, internalized cargoes are measured using confocal imaging and flow cytometry. We also describe strategies to determine the role of clathrin-mediated endocytosis (CME) in the internalization of a cargo by using a small molecule inhibitor of CME and knockout (KO) of the AAGAB gene, which encodes an essential regulator of CME.
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Affiliation(s)
- Shifeng Wang
- Department of Chinese Medicine Information Science, Beijing University of Chinese Medicine, Beijing, China.
- Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO, USA.
| | - Chun Wan
- Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO, USA
| | - Galen T Squiers
- Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO, USA
| | - Jingshi Shen
- Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO, USA.
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Akasaka E, Okawa Y, Nakano H, Takiyoshi N, Rokunohe D, Toyomaki Y, Sawamura D, Sueki H. Two Japanese familial cases of punctate palmoplantar keratoderma caused by a novel AAGAB mutation, c.191_194delCAAA. J Dermatol Sci 2015; 78:156-8. [PMID: 25771163 DOI: 10.1016/j.jdermsci.2015.02.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 01/16/2015] [Accepted: 02/06/2015] [Indexed: 12/23/2022]
Affiliation(s)
- Eijiro Akasaka
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Yuko Okawa
- Division of Dermatology, Showa University Northern Yokohama Hospital, Yokohama, Japan
| | - Hajime Nakano
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
| | - Noriko Takiyoshi
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Daiki Rokunohe
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Yuka Toyomaki
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Daisuke Sawamura
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Hirohiko Sueki
- Department of Dermatology, Showa University Graduate School of Medicine, Tokyo, Japan
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