Adjacent II segregation products in B–A translocations of maize

Kindiger, Bryan; Curtis, Christine A.; Beckett, J. C.

doi:10.1139/g91-090

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…Two interesting results have been derived from the analysis of B-A interchanges in maize (1) a reduced cross-over frequency in the region flanking the centromere (2) a cross-over frequency decrease in the vicinity of the breakpoints ( Anderson et al, 1955 ). Kindiger et al (1991) suggested that formation of a chain configuration between the A, A-B and B-A chromosomes is the consequence of the low frequency of chiasmata in the interstitial region of the A and B chromosomes facilitating increase in the probability of generation of gametes with A and A-Bs. Further, in rye, the induced B-A translocations are subjected to changes occurring during vegetative development ( Hasterok et al, 2002 ).…”

Section: Behaviour and Transmission Of Bsmentioning

confidence: 99%

Comprehending the dynamism of B chromosomes in their journey towards becoming unselfish

Rajpal

Sharma

Sehgal

et al. 2023

Front. Cell Dev. Biol.

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Investigated for more than a century now, B chromosomes (Bs) research has come a long way from Bs being considered parasitic or neutral to becoming unselfish and bringing benefits to their hosts. B chromosomes exist as accessory chromosomes along with the standard A chromosomes (As) across eukaryotic taxa. Represented singly or in multiple copies, B chromosomes are largely heterochromatic but also contain euchromatic and organellar segments. Although B chromosomes are derived entities, they follow their species-specific evolutionary pattern. B chromosomes fail to pair with the standard chromosomes during meiosis and vary in their number, size, composition and structure across taxa and ensure their successful transmission through non-mendelian mechanisms like mitotic, pre-meiotic, meiotic or post-meiotic drives, unique non-disjunction, self-pairing or even imparting benefits to the host when they lack drive. B chromosomes have been associated with cellular processes like sex determination, pathogenicity, resistance to pathogens, phenotypic effects, and differential gene expression. With the advancements in B-omics research, novel insights have been gleaned on their functions, some of which have been associated with the regulation of gene expression of A chromosomes through increased expression of miRNAs or differential expression of transposable elements located on them. The next-generation sequencing and emerging technologies will further likely unravel the cellular, molecular and functional behaviour of these enigmatic entities. Amidst the extensive fluidity shown by B chromosomes in their structural and functional attributes, we perceive that the existence and survival of B chromosomes in the populations most likely seem to be a trade-off between the drive efficiency and adaptive significance versus their adverse effects on reproduction.

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Section: Behaviour and Transmission Of Bsmentioning

confidence: 99%