Journal of Pure and Applied MicrobiologyVol. 9 No. 4

Molecular Identification of Malassezia Species with Direct DNA Extraction from Scalp of Patients with Dandruff and Seborrheic Dermatitis

Mahdi Zareei1, Shahla Roudbar Mohammadi1* and Shirin Shahbazi2

1Department of Medical Mycology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran. 2Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.

Received on 20 September 2015 and accepted on 03 November 2015

 

ABSTRACT

Malassezia genus in dandruff and seborrheic dermatitis which together have affected more than 50% of humans, have increasing proliferation in scalp. Proliferation of yeasts lead to scalp-flaking and create physical and mental disorder in people. The conventional culture-based methods for the isolation and identification of the Malassezia species in relative disease are labour intensive and time-consuming. We aimed to conduct a molecular analysis with direct DNA extraction from scalp in such patients at least time without complexity. In this cross sectional study, samples were taken from 65 patients with dandruff and seborrheic dermatitis. DNA extraction was performed directly from uncultured scalp by hexadecyltrimethylammonium bromide (CTAB method). Using species-specific primers derived from the 26s rDNA, PCR amplifications were performed. Identification of the species was carried out with enzyme CfoI in RFLP technique. CTAB method was applied as a more successful method for DNA extraction. Malassezia restricta was identified in %58.4 of the scalp specimens as the predominant species. In other 41.6% of cases, Malassezia restricta and Malassezia globosa were detected together. Molecular-based method of this study is able to diagnosis Malassezia yeasts in scalp without time-consuming culture-based method. Also the study shows the invasive characteristics of Malassezia restricta and Malassezia globosa species.

Keywords : Malassezia, Dandruff, seborrheic dermatitis, CTAB, 26 S rDNA.