Molecular cloning of a novel human papillomarvirus (type 58) from an invasive cervical carcinoma

Surface material analysis for human papillomavirus detection in nail Bowen's disease caused by HPV type 58

Over the past few years, cases of human papillomavirus (HPV) infection in nail Bowen's disease have been reported. This disease presents diagnostic challenges due to its similarity to nail malignant melanoma, particularly with respect to the clinical manifestation of black nail streaks. While skin biopsy is usually employed for diagnosis, it is an invasive procedure. We report the case of a 52-year-old healthy Japanese male with a pigmented streak on the nail of the fourth finger of his right hand, which had extended from the central to the lateral nail fold within 4 months. Dermoscopic examination revealed a dark-brown pigmented band with splinter microhemorrhage. Clinically, nail Bowen's disease was suspected. The lesion was excised in strips under local anesthesia. Histopathological examination revealed hyperkeratosis, parakeratosis, papillomatosis, and dyskeratotic cells with atypical nuclei irregularly arranged. Immunohistochemistry using anti-HPV L1 antibody detected HPV-positive cells in the upper epidermis and stratum corneum of the nail matrix. Mucosal high-risk HPV type 58 DNA was detected from brush cytology of the keratotic surface prior to surgery, which was confirmed in formalin-fixed, paraffin-embedded excised samples using polymerase chain reaction (PCR) and subsequent direct DNA sequencing. Our case highlights HPV type 58 as a potential causative agent of nail Bowen's disease and shows that brush cytology of the surface material prior to excision may be a useful and less invasive way for mucosal high-risk HPV detection. PCR analysis of the nail surface could serve as a supplementary diagnostic tool for nail Bowen's disease.

Differential requirement of the transcription factor HOXC13 for the stable maintenance of human papillomavirus genome among high-risk genotypes

The viral genome of the high-risk human papillomavirus (HPV), the causative agent of cervical cancer, is stably maintained as extrachromosomal episomes that establish persistent infection. We previously identified homeobox-transcription factor HOXC13 as an important host protein mediating the short-term retention of the HPV16 and HPV18 genomes in normal human immortalized keratinocytes (NIKS). Here, we used CRISPR-Cas9 technology to construct HOXC13 knockout (KO) NIKS cells to determine whether HOXC13 is required for the long-term maintenance of high-risk HPV genomes. HPV16, HPV18, HPV52, and HPV58 whole genomes were transfected into HOXC13 KO cells, and the copy number of viral genomes per cell was monitored over cell passages. Copy numbers of HPV16, HPV52, and HPV58 genomes decreased continuously in HOXC13 KO cells, whereas HPV18 genomes remained stable throughout passages. Thus, HOXC13 is critical for the stable maintenance of the viral genomes of HPV16, HPV52, and HPV58, but not HPV18.

Oncogenic comparison of human papillomavirus type 58 E7 variants

Human papillomavirus 58 (HPV58) ranks the second or third in East Asian cervical cancers. Current studies on HPV58 are scarce and focus on the prototype. Previously, we identified the three most common circulating HPV58 E7 strains contained amino acid alterations: G41R/G63D (51%), T20I/G63S (22%) and T74A/D76E (14%) respectively. Among them, the T20I/G63S variant (V1) had a stronger epidemiological association with cervical cancer. We therefore suggested that V1 possessed stronger oncogenicity than the other two variants. Here, we performed phenotypic assays to characterize and compare their oncogenicities with HPV58 E7 prototype. Our results showed that overexpression of V1 conferred a higher colony-forming ability to primary murine epithelial cells than prototype (P < 0.05) and other variants, implicating its higher immortalising potential. Further experiments showed that both V1 and prototype enhanced the anchorage-independent growth of NIH/3T3 cells (P < 0.001), implicating their stronger transforming power than the two other variants. Moreover, they possessed an increased ability to degrade pRb (P < 0.001), which is a major effector pathway of E7-driven oncogenesis. Our work represents the first study to compare the oncogenicities of HPV58 E7 prototype and variants. These findings deepened our understanding of HPV58 and might inform clinical screening and follow-up strategy.

Geographical distribution and oncogenic risk association of human papillomavirus type 58 E6 and E7 sequence variations

Human papillomavirus (HPV) 58 accounts for a notable proportion of cervical cancers in East Asia and parts of Latin America, but it is uncommon elsewhere. The reason for such ethnogeographical predilection is unknown. In our study, nucleotide sequences of E6 and E7 genes of 401 HPV58 isolates collected from 15 countries/cities across four continents were examined. Phylogenetic relationship, geographical distribution and risk association of nucleotide sequence variations were analyzed. We found that the E6 genes of HPV58 variants were more conserved than E7. Thus, E6 is a more appropriate target for type-specific detection, whereas E7 is more appropriate for strain differentiation. The frequency of sequence variation varied geographically. Africa had significantly more isolates with E6-367A (D86E) but significantly less isolates with E6-203G, -245G, -367C (prototype-like) than other regions (p ≤ 0.003). E7-632T, -760A (T20I, G63S) was more frequently found in Asia, and E7-793G (T74A) was more frequent in Africa (p < 0.001). Variants with T20I and G63S substitutions at E7 conferred a significantly higher risk for cervical intraepithelial neoplasia grade III and invasive cervical cancer compared to other HPV58 variants (odds ratio = 4.44, p = 0.007). In conclusion, T20I and/or G63S substitution(s) at E7 of HPV58 is/are associated with a higher risk for cervical neoplasia. These substitutions are more commonly found in Asia and the Americas, which may account for the higher disease attribution of HPV58 in these areas.

The preparation of human papillomavirus type 58 vaccine and exploring its biological activity and immunogenicity in vitro

OBJECTIVES

Human papillomavirus (HPV) type 58 is the second most prevalent virus infection among Chinese women. To develop an HPV58 vaccine that combines both prophylactic and therapeutic functions, we generate a chimeric virus-like particle (cVLP).

METHODS

The cVLPs contain both whole length L1 and parts of E7 peptides either from E7 amino acids (aa) 50 to aa72 or from E7 aa4 to aa12. The HPV58 L1-E7aa50-72 and L1-E7aa4-12 fusion proteins were revealed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and confirmed by Western blot (Supplementary Digital Content 1, http://links.lww.com/IGC/A40, which shows alignment of the protein sequence between HPV58 L1-E7aa50-72/4-12 and standard sequence). Protein folding and location of cVLPs were identified by transmission electron microscope. The immunogenicity of the fusion protein was tested by enzyme-linked immunospot assay.

RESULTS

Transmission electron microscope showed that the fusion protein formed cVLPs by self-assembly and the majority of particles located in the nucleus of the sf-9 insect cells. The cVLPs displayed a strong ability to agglutinate erythrocytes, which is distinguished from the parental VLPs. In addition, the purified HPV58 L1-E7aa50-72 or L1-E7aa4-12 fusion protein induced significant numbers of interferon γ-expressing E7aa50-72- or E7aa4-12-specific CD8 T cells.

DISCUSSION

Our results indicate that the insertion of the E7aa50-72 or E7aa4-12 peptides behind L1 did not disrupt the assembly of cVLPs and provided potent immunogenicity and bioactivity, which created a powerful basis for further preparations of HPV58 vaccines with prophylactic and therapeutic effects for the treatment of HPV58-related diseases including cervical cancer.

HPV-related carcinogenesis: basic concepts, viral types and variants

Human papillomavirus (HPV) constitutes a diverse group of small DNA virus, some extensively studied during the last three decades due to their carcinogenic potential. Persistence of viral infections and uncontrolled expression of E6 and E7 viral oncogenes are critical events in transformation. A surprisingly large number of different HPV types have been identified and classified (>100) and it has been anticipated that almost 200 may exist. HPV types are thought to have originated very early during human evolution and are now defined by their L1 genomic sequence, differing by >10% among them. Importantly, viral types are cell-type specific and usually produce different kinds of lesions, benign or malignant. In addition, these types have co-evolved with their hosts and have generated what we call now intratype variants. Variants of HPV types are found associated with the ethnicity of the populations and have been grouped geographically. It is believed that HPV intratype variants may differ in biological behavior. Recognition of the crucial role that some specific HPV types play in cervical cancer development is highly important for their prevention and implementation of public health strategies to control cervical cancer, still the leading cause of death among cancer patients in many developing nations. Here we review basic concepts of HPV-induced carcinogenesis and molecular differences found among HPV types and intratype variants and discuss their clinical and functional implications.

High prevalence of human papillomavirus type 58 in patients with cervical pre-malignant lesions in southern Brazil

Cervical cancer is the second most common type of cancer in women worldwide. Several human papillomavirus (HPV) genotypes, sexual behavior, and socioeconomic profile represent major risk factors for the development of this carcinoma. Cervical invasive cancer is preceded by cellular abnormalities that can be identified by cytological or histological exams. In order to determine the prevalence and genotypes of HPV in women with abnormal cytology or histopathology, cervical cell samples from 256 patients were evaluated for the presence of HPV/DNA by polymerase chain reaction (PCR), followed by virus genotyping by restriction fragment length polymorphism (RFLP). A total of 113 samples (51.2%) were HPV/DNA positive. Viral genotyping showed that the most prevalent genotypes were HPV 16 (34.7%) and 58 (13.8%), followed by HPV 33 (9.72%), 11 (8.33%), 18 (5.55%), 53 (5.55%), and 6 (4.2%). Four samples (5.55%) exhibited multiple infections due to the great similarity of socioeconomic characteristics and sexual behavior of HPV positive women, it was not possible to establish a risk profile for female HPV infection.

Pitfalls in the epidemiologic classification of human papillomavirus types associated with cervical cancer using polymerase chain reaction: driver and passenger

Cervical cancer is a common malignancy in women worldwide, and it has now been established that the human papillomavirus (HPV) is both necessary and causal for these lesions. HPV itself is both ubiquitous and markedly heterogeneous but can nevertheless be classified as either a high-risk type or a low-risk type based upon its frequency of detection in cervical cancer. Given that the association between HPV and cervical cancer is causal, the classification of this virus has been strengthened by large-scale epidemiologic studies and is widely accepted across many disciplines. It is evident, however, that cervical cancer is frequently associated with multiple HPV types. Therefore, it is crucial to distinguish causal types of HPV (drivers) from noncausal types (passengers) in cervical lesions. In this review, we highlight the current pitfalls of using polymerase chain reaction methods instead of Southern blot hybridization for detecting HPV and discuss the distinction between driver and passenger HPVs with regard to the viral type, the length of the viral genome, and the levels of viral DNA associated with cervical cancer. Finally, we newly propose three categories of HPV instead of two risk groups, based on similarities between viral genes.

Worldwide genomic diversity of the high-risk human papillomavirus types 31, 35, 52, and 58, four close relatives of human papillomavirus type 16

Among the more than one hundred formally described human papillomavirus (HPV) types, 18 are referred to as high-risk HPV types due to their association with anogenital cancer. Despite pathogenic similarities, these types form three remotely related taxonomic groups. One of these groups is called HPV species 9 and is formed by HPV-16, the most common and best-studied type, together with HPV-31, -33, -35, -52, -58, and -67. Previous worldwide comparisons of HPV-16 samples showed about 2% nucleotide diversity between isolates, which were subsequently termed variants. The distribution of divergent variants has been found to correlate frequently with the geographic origin and the ethnicity of the infected patients and led to the concept of unique African, European, Asian, and Native American HPV-16 variants. In the current study, we address the question of whether geography and ethnicity also correlate with sequence variations found for HPV-31, -35, -52, and -58. This was done by sequencing the long control region in samples derived from Europe, Asia, and Africa, and from immigrant populations in North and South America. We observed maximal divergence between any two variants within each of these four HPV types ranging from 1.8 to 3.6% based on nucleotide exchanges and, occasionally, on insertions and deletions. Similar to the case with HPV-16, these mutations are not random but indicate a relationship between the variants in form of phylogenetic trees. An interesting example is presented by a 16-bp insert in select variants of HPV-35, which appears to have given rise to additional variants by nucleotide exchanges within the insert. All trees showed distinct phylogenetic topologies, ranging from dichotomic branching in the case of HPV-31 to star phylogenies of the other three types. No clear similarities between these types or between these types and HPV-16 exist. While variant branches in some types were specific for Europe, Africa, or East Asia, none of the four trees reflected human evolution and spread to the extent illustrated by HPV-16. One possible explanation is that the rare HPV types that we studied spread and thereby diversified more slowly than the more abundant HPV-16 and may have established much of today's variant diversity already before the worldwide spread of humans 100,000 years ago. Most variants had prototypic amino acid sequences within the E6 oncoprotein and a segment of the L1 capsid protein. Some had one, two, or three amino acid substitutions in these regions, which might indicate biological and pathogenic diversity between the variants of each HPV type.

Human papillomavirus genomes in squamous cell carcinomas of the uterine cervix

The association between invasive cervical carcinoma and human papillomavirus (HPV) has now been established beyond doubt, but this is not necessarily a direct-and-effect association. To assess the causality of HPV, we analyzed HPV genomes in squamous cell carcinomas (SCCs) [corrected] of the uterine cervix by both blot hybridization and PCR. Genital HPV sequences were found in 231 (79%) of 294 SCCs by blot hybridization with more than five copies of entire HPV genomes identified in some cases including HPV 16 (92 cases), HPV 58 (32 cases), and HPV 52 (24 cases). By PCR-direct sequence analysis in 250 of 294 SCCs, genital HPV sequences were found in 240 samples (96%). The partial L1 sequences of HPV 16 were identified in 123 cases, and those of HPVs 18 and 31 were found in 24 and 20 cases, respectively. In addition, multiple HPV types were identified in 29 (12%) of 250 SCCs, and the HPV copy number, detected by PCR only, was less than 0.05. Marked discrepancies were therefore evident between the two analytical techniques. In this report, we discuss the causality of HPV for SCC with regard to the length of the viral genome, the amount of viral DNA, and multiple HPVs in single SCCs.

Prevalence of specific types of human papillomavirus and cervical squamous intraepithelial lesions in consecutive, previously unscreened, West-African women over 35 years of age

Previous studies among women worldwide have demonstrated that infection with specific types of human papillomaviruses (HPV) is central to the pathogenesis of cervical neoplasia. There is little data, however, concerning the prevalence of specific HPV types and the association of each type with cervical neoplasia among women in sub-Saharan Africa, who remain at very high risk of cervical cancer. We studied 2,065 consecutive patients aged 35 years or older, presenting to community health clinics in Dakar and Pikine, West Africa, who had not been screened previously for cytologic abnormalities or HPV. Cytologic diagnosis and HPV detection were accomplished using a ThinPrep Pap and a polymerase chain reaction-based reverse-line strip assay, respectively. Odds ratios (OR) and associated 95% confidence intervals (CI) were estimated using polynomial logistic regression. Cytologic abnormalities were found in 426 women (20%), including 254 (12%) with atypical squamous cells of undetermined significance, 86 (4%) with low-grade squamous intraepithelial lesions, 66 (3%) with high-grade squamous intraepithelial lesions (HSIL) and 20 (1%) with invasive cancer. HPV infection was detected in 18%. Among women with negative cytologic findings, the prevalence of high risk but not low risk HPV types increased with age. HPV16 (2.4%) and HPV58 (1.6%) were the most frequently detected HPV types in this population, as well as being the most strongly associated with risk of HSIL/cancer (HPV16: OR = 88, 95% CI = 39-200; HPV58: OR = 51, 95% CI = 16-161). These data suggest that in addition to HPV16, HPV58 should be considered in the strategic planning of vaccination against cervical cancer in this geographic region.

Human papillomavirus and cervical cancer

Of the many types of human papillomavirus (HPV), more than 30 infect the genital tract. The association between certain oncogenic (high-risk) strains of HPV and cervical cancer is well established. Although HPV is essential to the transformation of cervical epithelial cells, it is not sufficient, and a variety of cofactors and molecular events influence whether cervical cancer will develop. Early detection and treatment of precancerous lesions can prevent progression to cervical cancer. Identification of precancerous lesions has been primarily by cytologic screening of cervical cells. Cellular abnormalities, however, may be missed or may not be sufficiently distinct, and a portion of patients with borderline or mildly dyskaryotic cytomorphology will have higher-grade disease identified by subsequent colposcopy and biopsy. Sensitive and specific molecular techniques that detect HPV DNA and distinguish high-risk HPV types from low-risk HPV types have been introduced as an adjunct to cytology. Earlier detection of high-risk HPV types may improve triage, treatment, and follow-up in infected patients. Currently, the clearest role for HPV DNA testing is to improve diagnostic accuracy and limit unnecessary colposcopy in patients with borderline or mildly abnormal cytologic test results.

Human papillomavirus type 58 in Bowen's disease of the elbow

Human papillomavirus (HPV) can be detected in skin lesions of Bowen's disease, particularly on the fingers, and its genotype is associated with mucosal/genital types of HPV. We report herein an 85-year-old woman who had HPV-associated Bowen's disease on her elbow. HPV-58 DNA was detected in the lesion by polymerase chain reaction with restriction fragment length polymorphism and by Southern blot hybridization. In situ hybridization revealed numerous hybrid cells in the nuclei of the upper epidermis and stratum corneum of Bowen's disease. A high-risk type of mucosal HPV-58 DNA is associated with Bowen's disease in this case, suggesting that HPV-related Bowen's disease is not always restricted to genital or finger lesions.

"High risk" HPV types are frequently detected in potentially malignant and malignant oral lesions, but not in normal oral mucosa

Studies on the involvement of the human papillomavirus (HPV) in initiation and progression of oral neoplasia have generated conflicting results. The observed discrepancy is attributable mainly to the varying sensitivity of the applied methodologies and to epidemiologic factors of the examined patient groups. To evaluate the role of HPV in oral carcinogenesis, we analyzed 53 potentially neoplastic and neoplastic oral lesions consisting of 29 cases of hyperplasia, 5 cases of dysplasia, and 19 cases of squamous cell carcinomas, as well as 16 oral specimens derived from healthy individuals. A highly sensitive nested polymerase chain reaction (PCR) assay was used, along with type-specific PCR, restriction fragment length polymorphism analysis, dot blotting, and nonisotopic in situ hybridization. Nested PCR revealed the presence of HPV DNA in 48 of the 53 (91%) pathologic samples analyzed, whereas none (0%) of the normal specimens was found to be infected. Positivity for HPV was independent of histology and the smoking habits of the analyzed group of patients. At least one "high risk" type, such as HPV 16, 18, and 33, was detected by type-specific PCR in 47 (98%) infected specimens, whereas only 1 (2%) squamous cell carcinoma was solely infected by a "low risk" type (HPV 6). HPV 16 was the prevailing viral type, being present in 71% of infected cases. Single HPV 16 and HPV 18 infections were confirmed by restriction fragment length polymorphism. HPV 58 was detected by dot blotting in three hyperplastic lesions. HPV positivity and genotyping were further confirmed, and the physical status of this virus was evaluated by nonisotopic in situ hybridization. Diffuse and punctate signals, indicative of the episomal and integrative pattern of HPV infection, were observed for low- and high-risk types, respectively. Our findings are suggestive of an early involvement of high-risk HPV types in oral carcinogenesis.

Molecular cloning and nucleotide sequence analysis of a novel human papillomavirus (Type 82) associated with vaginal intraepithelial neoplasia

The genome of a novel human papillomavirus (HPV-82) was cloned from a vaginal intraepithelial neoplasia grade I. In our series of 291 biopsy specimens, HPV-82 was identified in one case each of cervical intraepithelial neoplasia grade II and grade III by blot hybridization. The histological localization of HPV-82 DNA in the three lesions was confirmed by in situ hybridization. The results indicated that HPV-82 is an etiologic agent for vaginal and cervical intraepithelial neoplasia. By nucleotide sequence similarity of L1 open reading frame (ORF), HPV-82 was closely related to HPV-26, -51, and -69. To know the precise relationship between the HPVs, we determined the complete sequence of HPV-82, as well as that of HPV-69. Sequencing revealed that the four HPVs had no initiation codon in the E5 ORF and had extensive nucleotide sequence similarities in all ORFs. In addition, they exhibited unique frame position patterns for ORFs, different from those of the other genital HPVs.

Detection and typing of human papillomavirus DNA in paired urine and cervical scrapes

The prevalence of human papillomavirus (HPV) in paired cervical scrape and urine specimens from 144 women attending a clinic for genitourinary medicine was determined by polymerase chain reaction (PCR) and nested PCR, using degenerate and general primer pairs localized within the L1 region. HPV typing was by restriction fragment length polymorphism (RFLP), type-specific PCR (HPV 6, 11, 16, 18, 33), and partial DNA sequencing of PCR products. HPV DNA was detected in 114 (84%) women. HPV DNA was detected in the specimens of 58 patients after amplification with MY09/MY11 primers and in a further 54 patients after nested PCR with the GP5+/GP6+ primers. A total of 106/136 (78%) of women had HPV DNA positive cervical scrapes and 89 (65%) had HPV DNA positive urine specimens. Both the urine and cervical specimens of 81 women were positive. In 25 women HPV DNA was detected in the cervical specimen only, and in 8 women HPV DNA was detected in the urine specimens only. A total of 108 specimens from 75 patients were typed. For 33 patients HPV typing was achieved in both the cervical and the urine specimens and 19 women had identical types in paired specimens. Multiple HPV infections could be detected in 15 (20%) of 75 women where either the cervical and urine specimen or both of the specimens could be typed. More then one HPV type was found in 8 specimens and from multiple sites (cervix and urinary tract) in the same patients on 7 occasions. The results of this study indicate that the detection of HPVs in the urogenital tract can be maximised through the testing of both cervical scrapes and urine specimens in conjunction with the use of a nested PCR to increase the sensitivity of HPV DNA detection. Also, urine cannot be a direct substitute for a cervical scrape as different HPV types are often detected in the urine compared with those detected in the cervix.

Detection of human papilloma virus type 58 in a case of a perianal Bowen's disease coexistent with adult T-cell leukemia

A case of Bowen's disease (BD) that appeared in the perianal region of a 65-year-old Japanese woman coexistent with chronic adult T cell leukemia (ATL) is described. Histopathological findings revealed that irregularly arranged tumor cells with atypical nuclei throughout the epidermis, which itself disclosed hyperkeratosis, dyskeratotic cells, and clumping cells. Positive staining for HPV antigens was immunohistochemically seen in several nuclei of the tumor cells. Electron microscopic study of the tumor tissue disclosed virus particles of about 50 nm in diameter form the squamous cells. A positive band at 256 bp was obtained by PCR using HPV-L1 primer. The amplified DNA by L1 primer completely corresponded to that of HPV-58.

Distinct manifestations of human papillomaviruses in the vagina

To clarify the pathogenic relationships between human papillomavirus (HPV) and vaginal intraepithelial neoplasia (VAIN), we examined 71 vaginal biopsy specimens by histopathology and immunohistochemistry and analyzed the presence of HPV DNA by blot hybridization at Tm - 40 degrees C using an HPV 58 probe (PBM-58 method). We found 27 cases of VAIN in patients with previous hysterectomy or antecedent or concomitant cervical intraepithelial neoplasia (CIN) and 44 cases of VAIN in patients without any abnormal findings on the cervix and the vulva. Histopathologically, 53 of 71 cases were graded as VAIN I and 15 and 3 cases were VAIN II and III, respectively, while 59 cases showed positivity for HPV capsid antigen by immunohistochemistry. Using the PBM-58 method, all 71 VAIN cases harbored a single HPV type at more than 1,000 viral copies per cell. We identified 15 different types (HPV 16, 18, 30, 31, 35, 40, 42, 43, 51, 52, 53, 54, 56, 58 and 66). Furthermore, we molecularly cloned 7 novel prototypes (HPV 59, 61, 62, 64, 67, 69 and 71) from VAIN I. Our results are strongly indicative that HPVs are etiologic agents of VAIN, like in the case of CIN. The distinct manifestations of HPV infection in the vagina are discussed in comparison with those in the cervix.

Human papillomavirus types 52 and 58 are prevalent in cervical cancers from Chinese women

A substantial body of evidence has confirmed human papillomavirus (HPV) infection as an etiologic agent in human cervical cancer. To evaluate the association between HPV and cervical cancer in Chinese women, we examined tumor specimens from women who lived in Shanghai, People's Republic of China. Biopsies from 40 women, diagnosed with either squamous-cell carcinoma (n = 35) or adenocarcinoma (n = 5) were tested for HPV DNA by PCR. The HPV types present in tumors were determined either by hybridization of PCR products with HPV type-specific probes or by PCR-based sequencing. A total of 35 of the 40 cervical cancer specimens (87.5%) contained HPV DNA. The following distribution and types were detected: 7.5% HPV 16, 10% HPV 18, 20% HPVs 16 and 18, 15% HPV 52, 15% HPV 58, 12.5% HPVs 52 and 58 and 7.5% unclassified HPVs. In this population of Chinese women with cervical cancer, HPV 52 and 58 were as prevalent as the "high-risk" (for cervical cancer) viruses HPVs 16 and 18.

Identification of genital human papillomaviruses in cervical biopsy specimens: segregation of specific virus types in specific clinicopathologic lesions

We have established a critical identification method for the full spectrum of genital human papillomaviruses (HPVs) in clinical specimens. It was based on the recognition of PstI, BanI and MspI cleavage patterns of HPV DNA detected by blot hybridization with HPV 58 DNA probe at Tm -40 degrees C. By this method, we identified 24 different types of genital HPV including 5 novel types (HPV 59, 61, 62, 64 and 67) in the specimens collected at one hospital and found almost all the HPVs with the authentic cleavage patterns of their respective prototypes. In 235 cervical biopsy specimens, HPV 6 or 11 was found in exophytic condyloma acuminatum (15/15) but not in any cervical intraepithelial neoplasia (CIN) specimens. In contrast, HPV 18, 30, 43, 54, 56, 59, 62, 66 and 67 were identified in CIN I (28/71) or II (4/56) but not in CIN III, while HPV 16, 31, 33, 35, 39, 51, 52 and 58 were identified in CIN III (83/93) as well as in CIN I (34/71) and II (47/56). The result indicates that heterogeneous genital HPVs prevail all over the world. In addition, HPV 6 and 11 are etiologic agents only of exophytic condyloma, whereas the other HPVs are etiologic agents of CIN with the segregation of specific HPVs in CIN III. We propose a new clinicopathologic grouping of genital HPVs founded on nucleotide homology of the HPV genome.

Analysis of cytomorphologically abnormal cervical scrapes for the presence of 27 mucosotropic human papillomavirus genotypes, using polymerase chain reaction

The aim of this study was to investigate the distribution of 27 mucosotropic human papillomavirus (HPV) genotypes (HPV 6, 11, 13, 16, 18, 30, 31, 32, 33, 35, 39, 40, 42, 43, 44, 45, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61 and 66) in cytomorphologically abnormal cervical scrapes (Pap IIIa-Pap IV; n = 1,373) using the polymerase chain reaction (PCR) method on crude cell suspensions. The scrapes were analyzed for the presence of HPV DNA by HPV general-primer-mediated PCR (GP-PCR), which allows the detection of a broad spectrum of HPV types at the subpicogram level. Subsequently, 2 HPV typing procedures based on either type-specific PCR (for HPV 6, 11, 16, 18, 31 and 33) or characterization of GP-PCR products by hybridization (for HPV 13, 30, 32, 35, 39, 40, 43, 44, 45, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61 and 66) were applied. Increasing total HPV prevalence was found with increasing severity of dysplasia from 71% in Pap IIIa to 100% in Pap IV scrapes (carcinoma in situ). The scrapes which were positive by type-specific PCR included 47% cases of Pap IIIa, 71% cases of Pap IIIb and 90% cases of Pap IV. Moreover, 12% of Pap IIIa scrapes, 6% of Pap IIIb scrapes and 8% of Pap IV scrapes revealed positivity for one or more of the remaining HPV types, as determined by successive hybridizations of the GP-PCR products. Taking the typing data together, we noted that the level of HPV heterogeneity decreased from 22 different HPV types (HPV 6, 11, 16, 18, 31, 33, 35, 39, 40, 42, 43, 44, 45, 51, 52, 54, 55, 56, 58, 59, 61 and 66) detected in the group of Pap IIIa scrapes to 13 (HPV 6, 11, 16, 18, 31, 33, 35, 45, 51, 52, 58, 59 and 61) and 10 HPV genotypes (HPV 6, 16, 18, 31, 33, 45, 51, 52, 54 and 58) in the Pap IIIb and Pap IV classes, respectively. An increasing prevalence rate from Pap IIIa to Pap IV was found for HPV 16, 18, 31, 33, 45 and 54. The prevalence rate of identified HPV genotypes increased from 59% in Pap IIIa to 98% in Pap IV, indicating that almost all high-risk HPV genotypes related to cervical cancer in The Netherlands have been characterized.

Identification and typing of human papillomavirus in cervical cancers in Taiwan

BACKGROUND

Although human papillomaviruses (HPV) are associated with cervical cancer, it has yet to be determined if specific HPV types have clinical or prognostic significance.

METHODS

Identification and typing of HPV were done by polymerase chain reaction (PCR) and restriction fragment length polymorphism.

RESULTS

Of the 43 cases of cervical cancer, 31 (72%) were HPV positive. The results of HPV typing in 40 cases of squamous cell carcinoma of the cervix revealed the presence of HPV-16 in 20 cases (50%), HPV-18 in 2 cases, HPV-11 in 1 case, HPV-33 in 1 case, HPV-52 in 1 case, HPV-58 in 1 case, and unidentified HPV types in 5 cases. Neither HPV-31 nor HPV-42 were present in our study. One case of squamous cell carcinoma had HPV-11 integration. Chi-square analysis revealed significant correlation between HPV genotypes and squamous cell patterns, no significant correlation between HPV genotypes and clinical stages, and cell differentiation of squamous cell carcinoma of cervix.

CONCLUSIONS

These findings may contribute to understanding the role of HPV in cancer and the value of typing as a prognostic indicator.

Detection of capsid antigen of human papillomavirus (HPV) in benign lesions of female genital tract using anti-HPV monoclonal antibody

We established a murine monoclonal antibody (K1H8) to human papillomavirus (HPV) using alkaline-disrupted virions of HPV type 1 (HPV-1) as the immunogen. K1H8 recognized a 57 kD capsid protein of HPV-1 and detected the antigen in paraffin sections of formalin-fixed tissue. With K1H8, we examined immunohistochemically 68 biopsy specimens obtained from the female genital tract. The specimens were histologically condyloma acuminatum or koilocytotic lesions with or without dysplasia and each specimen was found to harbour a single type of genital HPV, such as types 6, 11, 16, 18, 31, 33, 42, 51, 52, 56, and 58, by Southern blot hybridization analysis. The antigen was localized in the nuclei and occasionally in the cytoplasm of squamous cells showing koilocytotic changes. Eighty-four per cent of the specimens (57 cases) showed positivity for the antigen, indicating that K1H8 is a broadly-reactive antibody to various genital HPVs. The results suggest that benign mucosal lesions of the female genital tract are more frequently associated with viral production and are a potential source of transmission.

Molecular cloning of a novel human papillomavirus (type 60) from a plantar cyst with characteristic pathological changes

In a plantar cyst composed of the wall of the squamous cell layer and the horny inner substance in the lower dermis, we found characteristic pathological changes, such as cytoplasmic eosinophilic inclusions and vacuolated structure, and, immunohistochemically, the papillomavirus capsid antigen. The human papillomavirus (HPV) DNA cloned from the cyst showed no homology with other known prototypes of HPV (HPV 1 through HPV 59) by Southern blot analysis under stringent conditions and was named as HPV 60. HPV 60 DNA was found in three other cases of plantar cyst with the identical pathological changes, but not in a plantar cyst without such changes. The results suggest that HPV 60 has unique biological properties to induce a plantar cyst as a distinct type of cutaneous HPV.

Human papillomaviruses associated with cervical intraepithelial neoplasia. Great diversity and distinct distribution in low- and high-grade lesions

All together, 30 genital human papillomavirus (HPV) types have been characterized so far. To evaluate the importance of HPV diversity in associated cervical diseases, we analyzed 188 biopsy specimens obtained from patients with a recent diagnosis of cervical HPV infection or intraepithelial neoplasia (CIN). Of these 188 specimens, 116 were classified as low-grade CIN (48 cases), high-grade CIN (53 cases), condylomata acuminata (10 cases), flat condylomas (five cases). Seventy-two specimens were considered nondiagnostic. Using probes specific for 18 genital HPV types, HPV DNA sequences were detected by Southern blot hybridization in 100 lesions and 21 nondiagnostic specimens. When further analyzed by the polymerase chain reaction, eight HPV-negative biopsy specimens, four CIN, and four nondiagnostic specimens were positive. Of the 129 positive biopsy specimens, 92 contained at least one of 18 known HPV types and 37 HPV that have not yet been identified. Nine specimens had more than one type. Thirteen HPV types were identified in CIN. The detection rate of HPV 16 increased from 21% in low-grade CIN to 57% in high-grade CIN. HPV 18 was detected in only 3% of CIN; HPV 31, 33, and 35 were found in 8%. HPV 30, 39, 45, 51, 52, 56, 58, and 61 were detected in 44% of low-grade CIN but in only 8% of high-grade CIN. Unidentified HPV were detected in about 25% of low-grade and high-grade CIN. Fifty-seven CIN positive for at least one HPV type were further analyzed by in situ hybridization. Thirty-five (65%) biopsy specimens were positive, including 21 of 24 low-grade CIN and 14 of 33 high-grade CIN. Ten of the 13 previously identified HPV types were detected. Thus, CIN represents an heterogeneous disease from a virologic viewpoint. This fact could explain their variable clinical evolution.

General primer polymerase chain reaction in combination with sequence analysis for identification of potentially novel human papillomavirus genotypes in cervical lesions

We recently described the detection of potentially novel human papillomaviruses (HPV) genotypes (HPV types X [HPV X]) in cervical smears (A. J. C. van den Brule, C. J. L. M. Meijer, V. Bakels, P. Kenemans, and J. M. M. Walboomers, J. Clin. Microbiol. 28:2739-2743, 1990) by using the general primer-mediated polymerase chain reaction method (GP-PCR). In this study, the HPV specificities of GP-PCR products were determined by sequence analyses. M13 bacteriophage clones of PCR products derived from cloned unsequenced HPV genotypes 13, 32, 35, 43, 44, 45, 51, and 56 were subjected to dideoxy sequencing. Analyses of the putative amino acid sequences of these HPV types in addition to published HPV sequence data revealed stretches of highly conserved amino acid residues present in all HPV types, resulting in an HPV amino acid consensus sequence. Subsequently, HPV X-specific PCR products found in premalignant cervical lesions (n = 3), carcinomas in situ (n = 6), and invasive cancer (n = 6) were analyzed for their nucleotide sequences. Comparison of these sequences with published HPV nucleotide sequences and data obtained in this study revealed three HPV type 35, two HPV type 45, one HPV type 51, two HPV type 56, and six unique HPV X sequences, of which three types were present in four cases of carcinomas (in situ). The nucleotide sequences determined appeared to be unique after a data bank search. Furthermore, the sequences of all HPV X isolates matched the HPV amino acid consensus sequence, thus confirming HPV specificity. This study illustrates the power of GP-PCR in combination with sequence analysis to determine HPV specificity and genotyping of PCR products derived from sequenced as well as unsequenced HPVs, including novel, not yet identified HPV types.

Short sequence in L1 region of human papillomaviruses correlates with clinical pictures and grouping by cross-hybridization

A consensus primer-mediated polymerase chain reaction devised to amplify a short sequence in L1 region (L1-PCR) efficiently detected genital human papillomaviruses (HPVs) in clinical materials. Nucleotide sequencing of the amplified fragment showed that L1-PCR is also applicable to hitherto unsequenced HPVs. By comparing the amplified 210 nucleotides HPVs were classified into six groups, which are consistent with clinical pictures and a grouping based on cross-hybridization under the stringent condition.

The E7 functions of human papillomaviruses in rat 3Y1 cells

Among more than 60 human papillomavirus (HPV) genotypes, several HPVs are believed to be high risk because they are found in close association with cervical carcinoma. We compared the E7 genes from HPVs 1, 6b, 16, 18, and 33 for their transactivating, transforming, and mitogenic functions in a single cell line rat 3Y1. Whereas both the low-risk (1 and 6b) and the high-risk (16, 18, and 33) HPVs were transactivating for the adenovirus E2 promoter, only the high-risk HPVs were capable of focal transformation as assayed by an efficient method using the SR alpha-promoter and in conjunction with the HPV 16 E6 gene. The putative oncogenicity of HPVs appears to be reflected in vitro by the focal transformation, but not by the transactivation. Transient expression of the E7 genes controlled by the dexamethasone-responsive MMTV-LTR showed that the HPV 16 mutant E7s only with residual transforming activity were not mitogenic, but that, although the low-risk HPV E7s were less efficient, both the low-risk and high-risk HPV E7s were capable of inducing cellular DNA synthesis. Probably, the capability to induce cell DNA synthesis is necessary but not sufficient for the E7-mediated focal transformation.

Detection of human antibody against the human papillomavirus type 16 E7 protein

We examined 500 human sera for the presence of antibody against the human papillomavirus type 16 E7 protein by enzyme-linked immunosorbent assay with bacterially expressed fusion protein lac-E7, and by radioimmunoprecipitation and immunofluorescence assays with the E7 protein expressed in monkey COS-1 cells. The anti-E7 antibody was detectable in 6 out of 54 cases of cervical carcinoma, but in none of the others, including patients with other gynecologic cancers, those with sexually transmitted diseases, and healthy adults. The data indicate that expression of the E7 protein is closely related to cervical carcinoma.

Human papillomavirus type 58 DNA sequence

The complete nucleotide sequence of human papillomavirus type 58 (HPV 58) DNA cloned from an invasive cervical carcinoma was determined. The HPV 58 genome consists of 7824 nucleotides, containing 37.9% of GC residues, and has a similar genome organization of other HPVs. On the nucleotide sequence level, it conserves the signal sequences for regulation of gene expression as with other genital HPVs and exhibits an extensive homology with HPV 33 (77%). Comparative analysis of amino acid sequences reveals that HPV 58 is closely related with HPVs 16, 31, and 33, and is more distantly related with HPVs 6, 11, 18, and 39. HPVs 58, 16, 31, and 33 can be regarded as a group in HPV.

Relatively low prevalence of human papillomavirus 16, 18 and 33 DNA in the normal cervices of Japanese women shown by polymerase chain reaction

Ninety-two cervical scrapes and tissues, obtained from cytologically or histologically normal cervices of Japanese women, were examined for the presence of human papillomavirus (HPV) 16, 18 and 33 DNA by the polymerase chain reaction (PCR) method. Five out of 92 cases were HPV 16 DNA-positive, but neither HPV 18 nor 33 DNA was detected. The HPV (type 16, 18 and 33) prevalence rate in pregnant women, including postpartum, was 10% (3/31), which was higher than that in non-pregnant women. In two HPV 16-positive cases, we detected HPV 16 DNA again 2 months later. HPV (type 16, 18 and 33) prevalence in normal cervices was shown to be relatively low. However, it is very important to follow up the HPV-positive cases in cytologically normal cervices in order to elucidate the relation between HPV infection and the progression of cervical cancer.

Detection and typing of multiple genital human papillomaviruses by DNA amplification with consensus primers

Many types of human papillomavirus (HPV) are associated with genital lesions. In order to develop simple and sensitive diagnostic procedures for HPV infection, we took advantage of the polymerase chain reaction (PCR). We compared the published nucleotide sequences of the L1 region from six genital HPV types and designed a pair of consensus primers for L1 region. The PCR with the consensus primers for L1 region (L1-PCR) could amplify at least nine genital HPV types, 6, 11, 16, 18, 31, 33, 42, 52 and 58, and the amplified HPV DNA could be typed by subsequent restriction mapping. L1-PCR was compared to Southern blot analysis and also to the consensus primer-mediated PCR for E6 region (E6-PCR) described before. Although both our PCR systems are nonradioactive, PCR for E6 region (E6-PCR) described before. Although both our PCR systems are nonradioactive, the sensitivity in detecting HPV DNA was even better than that obtained by using Southern blot analysis. By means of the PCR systems we detected HPV DNA in 100% of cervical condylomas (10/10), 92% of cervical intraepithelial neoplasias (33/36) and 96% of invasive cervical carcinomas (53/55), while we detected HPV DNA in 12% of normal cervices (12/102).

Use of universal and type-specific primers in the polymerase chain reaction for the detection and typing of genital human papillomaviruses

By using polymerase chain reaction (PCR), we have developed a system for type-specific as well as universal detection of genital human papillomaviruses (HPVs). Primers and probes for specific detection of HPV-16, -18 and -33 were synthesized from the E7 open reading frame (ORF). They were capable of detecting corresponding HPV types with high specificity and sensitivity. Primers for detection of a broad spectrum of HPV (universal primers) were synthesized from the L1 ORF. The universal primers were shown to be capable of amplifying HPV-6b, -11, -16, -18, -33, -52b and -58. The system was applied to various cervical tissue specimens from Japanese patients. They consisted of 26 normal specimens, 18 from cervical dysplasias and 29 from cervical carcinomas. HPV was detected in none of the normal specimens. On the other hand, many of the specimens from cervical dysplasias and carcinomas were found to be positive for HPV, especially HPV-16. Except for one, all the specimens which were positive with the type-specific PCRs were also positive with the universal PCR. Furthermore, substantial numbers of specimens were found to be positive only with the universal PCR. Cloning and sequencing of DNA segments amplified by the universal primers were undertaken to characterize some of the unknown HPVs. Our PCR system may thus be useful for the specific detection of the three major types of oncogenic HPVs and also for the detection of a broad spectrum of HPVs including possibly novel HPV types.