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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276On-line version ISSN 1678-8060

Mem. Inst. Oswaldo Cruz vol.100 no.7 Rio de Janeiro Nov. 2005

http://dx.doi.org/10.1590/S0074-02762005000700012 

MOLECULAR CHARACTERIZATION

 

Mycobacterium avium restriction fragment lenght polymorphism-IS IS1245 and the simple double repetitive element polymerase chain reaction typing method to screen genetic diversity in Brazilian strains

 

 

Patrícia Carvalho de SequeiraI,2; Leila de Souza FonsecaII; Marlei Gomes da SilvaII; Maria Helena Féres SaadI,1

IDepartamento de Micobacterioses, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brasil
IIInstituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil

 

 


ABSTRACT

Simple double repetitive element polymerase chain reaction (MaDRE-PCR) and Pvu II-IS1245 restriction fragment length polymorphism (RFLP) typing methods were used to type 41 Mycobacterium avium isolates obtained from 14 Aids inpatients and 10 environment and animals specimens identified among 53 mycobacteria isolated from 237 food, chicken, and pig. All environmental and animals strains showed orphan patterns by both methods. By MaDRE-PCR four patients, with multiple isolates, showed different patterns, suggesting polyclonal infection that was confirmed by RFLP in two of them. This first evaluation of MaDRE-PCR on Brazilian M. avium strains demonstrated that the method seems to be useful as simple and less expensive typing method for screening genetic diversity in M. avium strains on selected epidemiological studies, although with limitation on analysis identical patterns except for one band.

Key words: IS1254-restriction fragment length polymorphism - Mycobacterium avium - MaDRE-polymerase chain reaction - nontuberculous mycobacteria - Aids


 

 

Even in developed countries human mycobacterial infections have been defeating the XX century science technology since tuberculosis by Mycobacterium tuberculosis complex and disseminated infection by nontu-berculous mycobacteria (NTM) has emerged as an important health problem associated to acquired immunodeficiency syndrome (AIDS). In developing countries, such as Brazil, were tuberculosis was never controlled, infection by NTM, of which mostly M. avium complex (MAC), has been identified in immune compromised patients (Ferreira et al. 2002).

In 1996, the treatment of human immunodeficiency virus (HIV) infection underwent considerable changes. Protease inhibitors and non-nucleoside analogue reverse transcriptase inhibitors became available for clinical practice, and more recently the fusion inhibitors, as part of a combination regimen of a highly active antiretroviral treatment (HAART) (Carpenter et al. 1996, Barbaro et al. 2005). However, although has been reported decrease of disseminated MAC (DMAC) infection in colonized individuals that argue in favor of a HAART protective effect against DMAC, restoration of CD4 counts seems not to protect patients against MAC colonization (Gadelha et al. 2002).

The epidemiology of the M. avium infection is not well understood. In the last decade available molecular methods have been useful for strains differentiation and for the understanding of epidemiological transmission of this environmental pathogen. M. avium has been typed successfully by IS1245-restriction fragment length polymorphism (RFLP) and pulsed field gel electrophoresis (PFGE) (Arbeit & Slutsky 1993, Guerrero et al. 1995, Devallois & Rastogi 1997, Ritacco et al. 1998, Saad et al. 1999, Legrand et al. 2000). However these methods are time consuming and expensive, besides they need a lot of extracted DNA. Picardeau and Vincent (1996) have introduced a rapid and easy polymerase chain reaction (PCR) based typing method of M. avium by amplification of the sequence between the IS1245 and IS1311, both present in this species. Despite it has been described with discriminatory power similar to IS1245-RFLP there is still disagreement about its discriminatory power (Pestel-Caron et al. 1999, Yoder et al. 1999).

The aim of this study is to evaluate the genetic polymorphism of Brazilian M. avium isolated from clinical and environmental source by the simple double repetitive elements (MaDRE-PCR) and compared with the IS1245-RFLP. We further evaluated the ability of the simple and rapid MaDRE-PCR to identify polyclonal infection since multiple isolates from Aids patients were available.

 

MATERIALS AND METHODS

The study included 41 MAC isolates obtained from 14 inpatients (Table) at Clementino Fraga Filho University Hospital, a Reference Center for Aids in Rio de Janeiro. HIV seropositive status was determined by ELISA/Western blot (Organon Teknica, Boxtei, The Netherland/Dupont, Welmington, US) and none of the patients was on HAART. All clinical information was obtained through retrospective review of the patients' medical records. A total of 237 environmental and animals specimens processed for culture in Löewenstein-Jensen at 37 °C, 53 yielded mycobacterial strains, of which ten (18.1%) were identified as belonging to MAC; eight strains were obtained from swine lymph node living free in backyard and two from raw vegetable and chicken (slaughtered collected from abattoir), respectively. Species isolation, biochemical, and M. avium molecular identification by 247bp IS 1245-PCR fragments were performed as described previously (Ferreira et al. 2002, Leite et al. 2005).

 

 

Genotypic characterization of the samples with IS1245-RFLP was performed as described by Saad et al. (1999). MaDRE-PCR was performed using a previously described method (Picardeau & Vincent 1996) with minor modification. Briefly, total DNA was prepared by enzymatic protocol as described elsewhere (van Soolinger et al. 1991). Amplification reaction was performed by adding 49 µl of Platinum® PCR Super Mix (LifeTechnologies, US) to 1 µl of the extracted DNA, 0.5M MgCl2 and 1 µM of each specific oligonucleotide primers (PA: 5CAGAGCCTCA GGCGA3 and PB: 5CAGAGCCTCACGCGGA3 (LifeTechnologies). Initial 2 min denaturation at 95 °C was followed by 35 amplification cycles of 1 min denaturation at 95 °C, 1 min annealing at 55 °C and 2 min elongation at 72 °C and finally one cycle of 10 min extension at 72 °C in MJ Research PTC-100 thermocycler (MJ Research Inc., MA, US). The amplicons were resolved on TBE 1.8% gel agarose containing 0.5 µg/ml ethidium bromide (Sigma & Aldrich, Saint Louis, US) by 90 V eletrophoresis/2 h. Ladder 100 bp was used as molecular weigh marker and M. avium clinical strain 40418 was used as standard isolate for all experiments.

DNA fingerprint pattern interpretation for both methods follow the convention established for genetic pattern generated for M. tuberculosis. MaDRE-PCR and RFLP banding pattern were analyzed visually. Strains with the same fingerprint from different patients were considered cluster and orphan patterns were those whose fingerprints were different from the others.

 

RESULTS

The strains were analyzed at first by MaDRE-PCR and 41 human and ten environments isolates were amplified by PCR. The banding pattern revealed a maximum of eight bands, some of them intense and some other corresponding to weaker bands. None of the strains failed to be amplified and the patterns found were reproducible in two PCR performed in different days on the different DNA preparation. Eleven out of 14 patients had multiple isolates cultured at different or the same time as described in the Table. Most of the multiple isolates were obtained from sterile body sites (27/38, 71%), in 7/11 patients all isolates showed the same MaDRE-PCR pattern for each patient (Fig. 1A). Patients 11 and 3 with three and five multiple isolates, respectively, showed different MaDRE-PCR pattern in one of them (Fig. 2A). In the first patient two isolates were obtained from bronquialveolar lavage (BAL) and one from induced sputum; all were collected at the same day, however one BAL isolate had MaDRE-PCR banding pattern differing in number and position from the other isolates. The second patient had one isolate from non-sterile site (feces) and bone marrow, respectively, and three isolates from blood, all collected in different days. The bone marrow strain showed a MaDRE-PCR banding pattern differing in number and position from the other and it was isolated one month later (01/03/1997) from one of the blood isolates (12/09/1996) (Table). On the other hand, patients 5 and 9, with three and four isolates each, obtained at the same or closer days, showed isolates with extra fragment despite of the majority of the bands being identical in size and position (Fig. 2B).

All strains from animals and vegetables yielded orphan MaDRE patterns and none were identical to human isolates (Fig. 3A).

RFLP polymorphism was complex showing three to 18 copies. Multiple isolates from different patients were found to be identical for each patient except for patients 3 and 11 confirming polyclonal pattern provided by MaDRE-PCR (Fig. 2A). However, for patients 5 and 9 RFLP isolates patterns were found to be identical (Fig. 2B).

For all multiple isolates from the same patients or from environment and animals MaDRE-PCR patterns interpretation was similar to that provided by RFLP. For all strains analyzed, cluster patterns were neither identified by PCR or RFLP.

 

DISCUSSION

This study performed with MaDRE-PCR was the first on Brazilian M. avium isolates and the results showed a limited number of bands (less than ten) as previously described by Pirardeau and Vincent (1996). Similar approach to type M. tuberculosis was used by Friedman et al. (1995) amplifying the nucleotides between the two repetitive elements; IS6110 and PGRS (G-C rich sequences). The reliability of the MaDRE-PCR typing method was confirmed by the same profile found on multiple isolates from the same patient. However, as described for M. tuberculosis DRE-PCR typing method, the presence of weak bands was observed. These features may result from cross hybridization with a related DNA sequence (Roiz et al. 1995, Picardeau & Vincent 1996) or it is related to technical limitation of the method. The same explanation may be applied for the finding of multiple isolates from the same patients (5 and 9) with identical patterns except for one or two extra bands in one of the strains of each patient, but RFLP provided identical pattern. This may introduce some difficulty for MaDRE pattern interpretation. However, where PCR amplification strains produced complete different patterns also displayed unrelated RFLP profiles (patients 3 and 11).

PCR and RFLP in patient 3, both discriminate infection involving different M. avium strains. In fact this patient had seven isolates during a period of 6 months and we analyzed five of those. Our result characterized polyclonal infection with persistence of the initial strain in blood. Picardeau and Vincent (1996) observed similar finding, when they studied sequential strains of M. avium isolated over 23 months. Despite similar results have been observed for patient 11 polyclonal infection could not be characterized. Human NTM infection is defined by a minimum criteria such as: (a) repeated isolates of the same strains from natural clinical specimen from sterile site with moderate to intense in vitro culture growth; (b) clinical evolution of active disease; and (c) exclusion of other pathogenic agent (Wallace et al. 1990). Contrarily to patient 3, patient 11 did not fulfill these criteria. Furthermore, strains obtained from non-sterile site may be only a colonize event and NTM, as M. avium, can be isolate from respiratory tract from healthy patients (Portaels 1995).

The overall result of PCR typing based on two insertion sequences present in M. avium provided a discriminatory power similar to RFLP results, since in both methods most of related strains yielded identical patterns and unrelated strains produced different profile, but careful interpretation must be taken among strains closely related, with identical banding pattern exception for one extra band. This finding is in agreement with results obtained by other comparing PCR-typing and PFGE methods (Pestel-Caron et al. 1999).

In both molecular typing system no cluster strains was seen in human, animals, and environment strains. Exposure to MAC organisms is impossible to avoid because they are ubiquitous, and the human infection reservoir remains unclear. Hot water (von Reyn et al. 1994), soil (Eaton et al. 1995), and animals such as pig have been proposed to be a source of M. avium for human infection. However Brazil does not have such hot water system and isolation of MAC strains from soil is a difficult task. Has been described that MAC pigs, food, and human isolates shared high degree of RFLP similarity, but direct link between them was not found (von Reyn et al. 1994, Mansfield & Lackner 1997, Yoder et al. 1999). Our results showed low genotyping patterns similarities between humans, environments, and animals strains but our sampling is too small and the environmental and animals' specimens were not taken from the same patients' geographic area. PCR typing to screening diversity of M. avium infecting human may favor links between environmental and animals' sources in further epidemiologal studies.

In summary, this study shows that the rapid, easy, and inexpensive PCR typing based on two M. avium-insertion sequences is useful for epidemiological studies such as detection of polyclonal infection, an event that may have treatment implications (Arbeit et al. 1993, Saad et al. 2000, Panunto et al. 2003). However we suggest to strict its use in small sampling from select set because of the limitation on analysis of patterns with difference in one band.

Despite HAART has dramatically decreased M. avium infections, it would be useful to have a simple and inexpensive genotypic method to easily screen a possible emergency of new genotype of M. avium among HIV patients with a change in their immunological status related to begging HAART (detection of a particular genotype in preexisting polyclonal infection) or when preexisting M. avium suppressive therapies or prophylaxis in patients on HAART are withdrawn (Legrand et al. 2000) or to follow the epidemiological evolution in HAART patient that remains colonized by M. avium as showed by Gadelha et al. (2002).

 

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Received 8 June 2005
Accepted 9 November 2005
Financial support: Faperj, CNPq (Milênio), the Johns Hopkins University (grant 1U19AI45432-01) awarded by the National Institutes of Health (US). This study contents are the sole responsibility of its authors and do not necessarily represent the official views of the NIH.

 

 

1 Corresponding author. E-mail:saad@ioc.fiocuz.br
2 Present address: Division of Infection Disease School of Public Healthy, University of California, Berkley, CA-94720, US

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