The MTB/STR Test Kit (MMCA) (Abbreviation: MTB/STR Test Kit) is an in vitro diagnostic reagent used for qualitative detection of streptomycin-resistance mutations in Mycobacterium tuberculosis from cultured Mycobacterium tuberculosis specimens or sputum samples. The kit employs PCR and melting curve analysis methods, by detecting mutations of rpsL codon 43 and codon 88, rrs positions 513~517 to determine the resistance of streptomycin.

Principle

The MTB/STR Test Kit (MMCA) employs dually labeled probes to target the excess single-stranded amplicons generated by asymmetric PCR; then uses melting curve analysis to generate the minus derivative of the fluorescence intensity versus temperature, and compares the melting temperature (Tm) to gain mutation information of the sequences. Where, perfect match of target sequence and probe gives the highest Tm; partially mismatch, e.g., point mutation, insertion or deletion, would cause decreased Tm than that of perfect match. The decreased degree is related to the type of point mutation, base number of insertion or deletion as well as the mutation location.

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