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Biotecnologia Aplicada
Elfos Scientiae
ISSN: 0684-4551
Vol. 15, No. 3, 1998
Bioline Code: ba98027
Full paper language: English
Document type: Research Article
Document available free of charge

Biotecnologia Aplicada, Vol. 15, No. 3, 1998

 en A single-step screening procedure for Pichia pastoris clones, by PCR

Abstract

Biotecnología Aplicada 1998;15:173-175

A single-step screening procedure for Pichia pastoris clones, by PCR

Camilo Ayra-Pardo, Ciro García Martínez and Gustavo A de la Riva

Code Number: BA98027
Size of Files:
Text: 13K
Graphics: Line drawings (gif) - 34K

ABSTRACT

The screening of Pichia pastoris transformants is always necessary to avoid any possible selection of "false" transformants resulting from a gene conversion event between the transforming vector his4 gene and the mutant his4 locus in the Pichia genome. True transformants can be identified by conventional Southern blot or by polymerase chain reaction (PCR) analysis of purified genomic DNA, although both methods have the disadvantage of being time-consuming and the number of clones that can be simultaneously screened is limited. In this report, we describe a faster method for the screening of P. pastoris clones, using a single-step PCR procedure from fresh-intact colonies.

Key words: PCR, Pichia pastoris, methylotrophic yeast, AOX1

RESUMEN

El análisis de transformantes de Pichia pastoris es siempre necesario para eliminar la selección de "falsos" positivos resultantes del evento de conversión génica entre el gen his4 del vector de transformación y el locus his4 en el genoma de Pichia. Los transformantes positivos pueden ser identificados por técnicas convencionales como Southern blot o reacción en cadena de la polimerasa (RCP), a partir de ADN genómico purificado. No obstante, ambos métodos tienen la desventaja de ser procedimientos de larga duración y de permitir el análisis de un número limitado de clones simultáneamente. En este reporte describimos un método de pesquisaje en un solo paso de clones de P. pastoris mediante RCP de colonias frescas intactas.

Palabras claves: RCP, Pichia pastoris, levadura metilotrófica, AOX1

Copyright 1998 Elfos Scientiae

 

Alternative site location: http://elfosscientiae.cigb.edu.cu/Archivo.asp?Id=6

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