B chromosomes in populations of Apodemus flavicollis – never ending story
2023
Аутори:
Vujošević, MladenRajičić, Marija
Budinski, Ivana
Bajić, Branka
Adnađević, Tanja
Blagojević, Jelena
Тип документа:
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт:
B chromosomes (Bs) are uncommon in mammals, featuring less than 2% of species, but six out of 22 species possess them in the genus Apodemus. In Serbia, over 40 populations of yellow-necked mice
(Apodemus flavicollis) with varying habitat quality were studied. The frequency of B carriers (range: 0.09 to 0.67) increased with elevation, correlated with sub-zero days, and inversely with average temperature. B carrier frequency remained stable over eight years despite population density fluctuations, while seasonal variations linked to population size were observed. Overcrowding stress reduced B carriers among pre-reproductive individuals but enhanced survival in suboptimal conditions.
Phenotypic traits and B frequency were correlated, influencing cranial morphometric development. B carriers showed distinct developmental pathways for cranial traits, suggesting environment-specific benefits. Bs’ presence did not affect carrier fecundity or fertility and was evenly distributed across age groups. B chromosomes (up to five) displayed common structures across populations in Serbia and Eastern Europe, possibly originating from sex chromosome pericentromeric regions. B-specific chromatin spatially resembled pericentromeric sex chromosomes, suggesting a similar mechanism to bypass meiotic
checkpoints.
Current data support a heterotic model in A. flavicollis. Bs likely contribute to species adaptability by increasing genetic variability, potentially expanding their distribution.
Финансирање / пројекти:
- Генетичка и фенетичка разноврсност у природним популацијама у различитим срединама - допринос полиморфизма Б хромозома (RS-MESTD-Basic Research (BR or ON)-173003)
У:
- Meeting Abstracts from the 5th B Chromosome Conference; 2023 Oct 14-17; Petnica, Serbia. Springer Nature; 2023. p. 33. (BMC Proceedings; Vol. 17; Suppl. 20).