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“knobs”

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Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

The presence of Ab10 does not affect the rate of normal chromosome movement.

Taxon: maizeZea mayse0
Treatment: The presence of Ab10e3
Gene: Ab10e3
Outcome: rate of normal chromosome movemente3
Direction: does not affecte3

Not reportedComparator

Verbatim

e0
“In maize, neocentromeres are induced by a gene or genes on Abnormal chromosome 10 (Ab10) which causes heterochromatic knobs to move poleward at meiotic anaphase”
✓ located verbatim in the source · abstract, characters 83–243

e3
“The presence of Ab10 does not affect the rate of normal chromosome movement but propels neocentromeres poleward at rates as high as 1.4 micron/min”
✓ located verbatim in the source · abstract, characters 766–912

Title

Neocentromere-mediated Chromosome Movement in Maize

Hong-Guo Yu; Evelyn N. Hiatt; Annette Chan; et al. The Journal of Cell Biology 1997. doi:10.1083/jcb.139.4.831

Other claims from this paper (8)

Observation Neocentromeres are active from prometaphase through anaphase in maize meiosis.
Observation Normal chromosomes move on the spindle at an average rate of 0.79 micron/min during mid-anaphase.
Intervention effect Ab10 propels neocentromeres poleward at rates as high as 1.4 micron/min.
Intervention effect Kinetochore-mediated chromosome movement is only marginally affected by a linked neocentromere.
Observation Unlike kinetochores, neocentromeres associate laterally with microtubules.
Observation Neocentromere movement is correlated with knob size.
Mechanism Microtubule depolymerization is not required for neocentromere motility.
Mechanism Neocentromeres are mobilized on microtubules by minus end-directed motor proteins.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

CRISPR mutagenesis of Trkin on Ab10 does not improve meiotic drive or fitness in maize.

Taxon: maizeZea mayse1
Treatment: CRISPR mutagenesise3
Gene: Trkine4
Outcome: drive or fitnesse4
Direction: does not improvee4

Not reportedComparator

Verbatim

e1
“In maize, there are 2 meiotic drive systems that target large heterochromatic knobs composed of tandem repeats known as knob180 and TR-1”
✓ located verbatim in the source · abstract, characters 0–136

e3
“We also carried out CRISPR mutagenesis to test the role of Trkin on Ab10 and K10L2”
✓ located verbatim in the source · abstract, characters 884–966

e4
“The data indicate that the Trkin gene on Ab10 does not improve drive or fitness”
✓ located verbatim in the source · abstract, characters 968–1047

Title

Conflicting Kinesin-14s in a single chromosomal drive haplotype

Meghan J Brady; Anjali Gupta; Jonathan I Gent; et al. Genetics 2025. doi:10.1093/genetics/iyaf091

Other claims from this paper (5)

Observation The K10L2 haplotype has strong homology to an internal portion of the Ab10 haplotype.
Intervention effect Trkin on Ab10 has a weak deleterious effect when paired with a normal chromosome 10 in maize.
Intervention effect The deleterious effect of Ab10 is more severe when Ab10 is paired with K10L2 in maize.
Intervention effect Functional Trkin on either chromosome nearly abolishes Ab10 drive in maize.
Observation Modeling suggests that Trkin is unlikely to persist on Ab10.

Associationobservedoriginal resultno effectmeasured

Claim · model-written summary

The 180- and 350-bp tandem repeats are not independently sufficient to confer knob heterochromatin, even when present at megabase sizes.

Taxon: maizeZea mayst0
Gene: these tandem repeatse2
Outcome: confer knob heterochromatine2
Qualifier: even when present at megabase sizese2

Not reportedDirection

Verbatim

t0
“Knobless Maize Lines”
✓ located verbatim in the source · title, characters 114–134

e2
“Our results show that the number of 180- and 350-bp repeat loci do not correlate with the number of knobs in maize and that these tandem repeats are not independently sufficient to confer knob heterochromatin, even when present at megabase sizes”
✓ located verbatim in the source · abstract, characters 301–546

Title

Fluorescence In Situ Hybridization Analysis Reveals Multiple Loci of Knob-associated DNA Elements in One-knob and Knobless Maize Lines

Sami S.M. Adawy; Robert M. Stupar; Jiming Jiang Journal of Histochemistry & Cytochemistry 2004. doi:10.1369/jhc.4b6335.2004

Other claims from this paper (2)

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