New York, Sep 2 IANS | 15 days ago

The bacteria living inside us can distinguish friendly viruses from the harmful ones, a quality that helps them expand their diet and attack humans efficiently, says a study.


One variety of the bacterial immune system known as the CRISPR-Cas system can distinguish viral friend from foe by watching for one particular cue called transcription, the findings showed.

"Transcription - an initial step in the process that reads genes, including those of viruses - makes the difference," said researcher Luciano Marraffini from the Rockefeller University in the US.

"The full genome of viruses in their lytic, or destructive phase, is transcribed. Meanwhile, a few of the genes from a virus are transcribed during its lysogenic, or dormant phase," Marraffini explained.

Viruses in their lytic phase make copies of themselves using a cell's machinery before destroying it to liberate these new viruses.

Viruses in their lysogenic phase, meanwhile, quietly integrate into a host's genetic material.

And this is where they offer their potential benefit to the bacteria, which co-opt viral genes for their own ends.

In fact, the bacterium responsible for diphtheria must pick up the right virus in order to attack humans.

Scientists have discovered this adaptive bacterial immune system recently.

The study appeared in the journal Nature.

(Posted on 02-09-2014)

Share This Page:


Post your comments


Information on States of India:

Andaman Nicobar | Andhra Pradesh | Assam | Bihar | Chandigarh | Chhattisgarh | Dadar Nagar Haveli | Daman Diu | Delhi | Goa | Gujarat | Haryana | Himachal Pradesh | Jammu Kashmir | Jharkhand | Karnataka | Kerala | Lakshadweep | Madhya Pradesh | Maharashtra | Manipur | Meghalaya | Mizoram | Nagaland | Orissa | Pondicherry | Punjab | Rajasthan | Sikkim | Tamil Nadu | Tripura | Uttar Pradesh | Uttaranchal | West Bengal

INDIA REGIONAL MAPS:

Andhra Pradesh Travel Map | Bihar Travel Map | Goa Travel Map | Gujarat Travel Map | Haryana Travel Map | Himachal Pradesh Map | Karnataka Travel Map | Kerala Travel Map | Maharashtra Travel Map | Punjab Travel Map | Rajasthan Travel Map | Sikkim Travel Map | Tamil Nadu Travel Map | Uttar Pradesh Travel Map | West Bengal Travel Map |

MORE MAPS OF INDIA:

Airports of India | Districts of India | India Pilgrim Centers | Tourism Map of India | National Highways in India | India Railway Routes |

INDIA CITY MAPS:

Ahmadabad | Bangalore | Chennai | Coimbatore | Delhi | Hyderabad/Secunderabad | Kochi | Kolkata | Mumbai | Pondicherry | Pune | Surat |

KERALA TRAVEL MAPS:

Alappuzha | Ernakulam | Idukki | Kannur | Kasaragod | Kollam | Kottayam | Kozhikode | Malappuram | Palakkad | Pathanamthitta | Thiruvananthapuram | Thrissur | Wayanad |