Full HPV typing by a single restriction enzyme.
BACKGROUND
Restriction fragment length polymorphism (RFLP) methods for genotyping genital human papillomavirus (HPV) are considered labor consuming and constrained by the reduced set of restriction enzymes capable of detecting specific mutations. However, we think that these methods have not taken full advantage of the high diversity of the known restriction enzymes.


OBJECTIVE
We have set out to find the best restriction enzyme for HPV typing.


METHODS
An extensive search for enzymes was carried out by combining statistical methods and database information. The search maximized the discrimination between high- and low-risk types by examining the sequence of the L1 gene flanked by primers MY09/11. Different electrophoretic resolutions and two variations of the RFLP method were considered.


RESULTS
HpyCH4V is the best enzyme for discriminating between risk types. Moreover, HpyCH4V generates different patterns for virtually all the HPV types. The typical pattern consists of two or three fragments, which facilitates typing in mixed infections. The typing of a set of clinical samples confirmed the expectations.


CONCLUSIONS
This result illustrates the possibilities of statistical methods to exploit the high diversity of restriction enzymes in order to classify samples in a pre-established hierarchy of types for which DNA sequences are known.
Santiago
Enrique
E
Departamento de Biología Funcional, Universidad de Oviedo, 33071 Oviedo, Spain. esr@uniovi.es
Camacho
Lucía
L
Junquera
Maria Luisa
ML
Vázquez
Fernando
F
D052160:Benzothiazoles; D036022:Capsid Proteins / Q000235:genetics; D004262:DNA Restriction Enzymes / Q000378:metabolism*; D004279:DNA, Viral / Q000235:genetics*; D003959:Diamines; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005456:Fluorescent Dyes; D005838:Genotype; D006801:Humans; D009856:Oncogene Proteins, Viral / Q000235:genetics; D009930:Organic Chemicals; D027383:Papillomaviridae / Q000145:classification* / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D011804:Quinolines; D013194:Staining and Labeling; D014773:Virology / Q000379:methods*
D052160:Benzothiazoles; D036022:Capsid Proteins; D004279:DNA, Viral; D003959:Diamines; D005456:Fluorescent Dyes; C114580:HPV L1 protein, Human papillomavirus; D009856:Oncogene Proteins, Viral; D009930:Organic Chemicals; D011804:Quinolines; C098022:SYBR Green I; D004262:DNA Restriction Enzymes