AI Article Synopsis
- B chromosomes are extra chromosomes found in many eukaryotes and accumulate repetitive DNA, which is crucial for their evolution.
- The characiform fish was among the first species identified with B chromosomes, displaying various forms and different counts of these micro-B chromosomes.
- A study mapped 35 satellite DNAs in this fish, revealing that six are present on all B-types, suggesting they have similar genetic content, while also discovering a population that lacks B chromosomes entirely.
Article Abstract
B or supernumerary chromosomes are dispensable elements that are widely present in numerous eukaryotes. Due to their non-recombining nature, there is an evident tendency for repetitive DNA accumulation in these elements. Thus, satellite DNA plays an important role in the evolution and diversification of B chromosomes and can provide clues regarding their origin. The characiform was one of the first discovered fish species bearing B chromosomes, with all populations analyzed so far showing one to nine micro-B chromosomes and exhibiting at least three morphological variants (Ba, Bsm, and Bm). To date, a single satellite DNA is known to be located on the B chromosomes of this species, but no information regarding the differentiation of the proposed B-types is available. Here, we characterized the satellitome of and mapped 35 satellite DNAs against the chromosomes of , of which six were equally located on all B-types and this indicates a similar genomic content. In addition, we describe, for the first time, an entire population without B chromosomes.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8235050 | PMC |
| http://dx.doi.org/10.3390/cells10061527 | DOI Listing |
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