Recombinant Human Papilloma Virus type 31 L1 protein (VLP) (DAGF-231)

Human Papilloma Virus type 31 L1 protein (VLP), recombinant protein from E. coli

Molecular Weight
55 kDa
Alternative Names
HPV 31 L1; L1; Major capsid protein L1
> 95%(SDS-PAGE)
Batch dependent - please inquire should you have specific requirements.
500 mM Histidine 100mM NaCl 0.02%Tween80(pH6.0)
Store at -70°C, avoid repeat freeze/thaw cycles
Antigen Description
Human papillomavirus (HPV) is a DNA virus from the papillomavirus family that is capable of infecting humans. Like all papillomaviruses, HPVs establish productive infections only in keratinocytes of the skin or mucous membranes. L1 is a major capsid protein of human papilloma virus. Infection with specific types of HPV has been associated with an increased risk of developing cervical neoplasia. Does not bind DNA.
HPV 31 L1; L1; Major capsid protein L1


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Methylation markersFAM19A4andmiR124-2as triage strategy for primary human papillomavirus screen positive women: A large European multicenter study


Authors: Bonde, Jesper; Floore, Arno; Ejegod, Ditte; Vink, Frederique J.; Hesselink, Albertus; van de Ven, Peter M.; Valencak, Anja Ostrbenk; Pedersen, Helle; Doorn, Saskia; Quint, Wim G.; Petry, Karl Ulrich; Poljak, Mario; Stanczuk, Grazyna; Cuschieri, Kate; de Sanjose, Silvia; Bleeker, Maaike; Berkhof, Johannes; Meijer, Chris J. L. M.; Heideman, Danielle A. M.

In human papillomavirus (HPV) cervical cancer screening, cytology is used as triage to counter the low specificity of HPV testing. VALID-SCREEN is a EU-multicenter, retrospective study conducted to evaluate the clinical performance of the FAM19A4/miR124-2 methylation-based molecular triage test as a substitute or addition to cytology as reflex testing of HPV screen positive women. FAM19A4/miR124-2 methylation test (QIAsure Methylation Test) was evaluated in 2384 HPV-positive cervical screening samples, from women 29-76 years of age, derived from four EU countries. Specimens were collected in ThinPrep or SurePath media, HPV-status, concurrent cytology, and histology diagnosis were provided by the parent institutes. The control population consisted of women with no evidence of disease within 2 years of follow-up. A total of 899 histologies were retrieved; 527 showed no disease, 124 CIN2 (5.2%), 228 CIN3 (9.6%) and 20 cervical cancers (0.8%); 19 of 20 screen-detected cervical cancers were found methylation-positive (sensitivity 95%). Overall specificity of FAM19A4/miR124-2 methylation test was 78.3% (n = 2013; 95%CI: 76-80). The negative predictive value of hrHPV positive, methylation-negative outcomes were 99.9% for cervical cancer (N = 1694; 95%CI: 99.6-99.99), 96.9% for >= CIN3 (95%CI: 96-98), and 93.0% for >= CIN2 (95%CI: 92-94). Overall sensitivity for CIN3 using FAM19A4/miR124-2 methylation test was 77% (n = 228; 95%CI: 71-82). CIN3 sensitivity was uniform between centers independent of sample collection medias, DNA extraction methods and HPV screening tests. Being objectively reported compared to the subjectivity of cytology, equally performing across settings and screening methods, theFAM19A4/miR124-2methylation constitute an alternative/supplement to cytology as triage method to be investigated in real-life pilot implementation.

Laser-assisted rapid evaporative ionisation mass spectrometry (LA-REIMS) as a metabolomics platform in cervical cancer screening


Authors: Paraskevaidi, Maria; Cameron, Simon J. S.; Whelan, Eilbhe; Bowden, Sarah; Tzafetas, Menelaos; Mitra, Anita; Semertzidou, Anita; Athanasiou, Antonis; Bennett, Phillip R.; MacIntyre, David A.; Takats, Zoltan; Kyrgiou, Maria

Background: The introduction of high-risk human papillomavirus (hrHPV) testing as part of primary cervical screening is anticipated to improve sensitivity, but also the number of women who will screen positive. Reflex cytology is the preferred triage test in most settings but has limitations including moderate diagnostic accuracy, lack of automation, inter-observer variability and the need for clinician-collected sample. Novel, objective and cost-effective approaches are needed. Methods: In this study, we assessed the potential use of an automated metabolomic robotic platform, employing the principle of laser-assisted Rapid Evaporative Ionisation Mass Spectrometry (LA-REIMS) in cervical cancer screening. Findings: In a population of 130 women, LA-REIMS achieved 94% sensitivity and 83% specificity (AUC: 91.6%) in distinguishing women testing positive (n = 65) or negative (n = 65) for hrHPV. We performed further analysis according to disease severity with LA-REIMS achieving sensitivity and specificity of 91% and 73% respectively (AUC: 86.7%) in discriminating normal from high-grade pre-invasive disease. Interpretation: This automated high-throughput technology holds promise as a low-cost and rapid test for cervical cancer screening and triage. The use of platforms like LA-REIMS has the potential to further improve the accuracy and efficiency of the current national screening programme. Funding: Work was funded by the MRC Imperial Confidence in Concept Scheme, Imperial College Healthcare Charity, British Society for Colposcopy and Cervical Pathology, National Research Development and Innovation Office of Hungary, Waters corporation and NIHR BRC. (c) 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (

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