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Effect of SPbetaviruses on kin discrimination in Bacillus subtilis
ID Cotič, Gaja (Author), ID Dragoš, Anna Magdalena (Mentor) More about this mentor... This link opens in a new window, ID Štefanič, Polonca (Comentor)

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Abstract
In this master's thesis, we investigated the role of lysogenic bacteriophages from the Spbetavirus genus in kin discrimination in the bacterium Bacillus subtilis. We studied how the integration of prophages changes social interactions between strains. The results confirmed that the mere presence of a prophage can shift an interaction from kin to non-kin. By analysing phage release using a confluent plaque assay, we found that the induction of prophages at the boundary line where the swarming lysogens meet is not strongly linked to the kin system. A subsequent cross-immunity test revealed that the phi3T lysogen can lyse all other lysogens, while its lysogen was susceptible to three other phages. This unique position of phi3T is hypothesised to contribute to a more intense conflicts at colony boundaries. Collectively, the evidence indicates that Spbetavirus prophages function as significant genetic modulators of bacterial sociality, with the phi3T phage playing a special role in lysogen interactions. The precise mechanisms by which host interactions influence the switch of prophages to the lytic cycle remain a subject for future research.

Language:English
Keywords:lysogenic bacteriophages, kin discrimination, prophage induction, Bacillus subtilis, Spbetavirus
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:BF - Biotechnical Faculty
Publisher:[G. Cotič]
Year:2026
PID:20.500.12556/RUL-180062 This link opens in a new window
UDC:602.3:578.347:601.4:577.21:602.4
COBISS.SI-ID:270024707 This link opens in a new window
Publication date in RUL:01.03.2026
Views:286
Downloads:181
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Secondary language

Language:Slovenian
Title:Vpliv Spbetavirusov na sorodstveno razlikovanje pri bakteriji Bacillus subtilis
Abstract:
V tem magistrskem delu smo raziskovali vlogo lizogenih bakteriofagov iz rodu Spbetavirus v sorodstvenem razlikovanju pri bakteriji Bacillus subtilis. Preučevali smo, kako vstavljeni profagi spreminjajo socialne interakcije med gostiteljskimi sevi. Rezultati so potrdili, da lahko prisotnost profaga spremeni interakcijo iz kin v ne-kin. Z analizo sprostitve fagov s konfluentnim testom plakov smo ugotovili, da aktivacija profaga na mestu stika rojev sevov v večini ni povezana s sistemom sorodstvene diskriminacije. Nadaljnji test navzkrižne imunosti je razkril, da je phi3T edini sposoben lizirati vse druge lizogene seve, njegov lizogen pa je bil dovzeten za tri druge raziskane fage. Ta edinstven položaj phi3T verjetno prispeva k intenzivnejšim negativnim interakcijam med rojenjem. Skupaj rezultati kažejo, da fagi Spbetavirus delujejo kot pomembni genetski modulatorji bakterijske socialnosti, pri čemer fag phi3T igra posebno vlogo v interakcijah med lizogeni. Natančni mehanizmi, s katerimi interakcije vplivajo na preklop profagov v litični cikel, ostajajo predmet prihodnjih raziskav.

Keywords:lizogeni bakteriofagi, sorodstvena diskriminacija, indukcija profaga, Bacillus subtilis, Spbetavirus

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