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Mechanismhypothesisoriginal resultbasis n/a

Claim · model-written summary

The B component may have evolved from the 180-bp knob repeat through mutations during evolution (author interpretation).

Taxon
maizeZea mayse2
Outcome
B componente3
Qualifier
as a result of mutations during evolutione3

Verbatim

e2

“we isolated 59 clones belonging to the TR-1 family from maize and teosinte”

✓ located verbatim in the source · abstract, characters 103–177
e3

“the B component may evolve from the 180-bp knob repeat as a result of mutations during evolution”

✓ located verbatim in the source · abstract, characters 569–665

Title

Molecular Characterization of a Family of Tandemly Repeated DNA Sequences, TR-1, in Heterochromatic Knobs of Maize and Its Relatives

F C Hsu; C J Wang; C M Chen; et al. Genetics 2003. doi:10.1093/genetics/164.3.1087

Other claims from this paper (8)
Mechanismhypothesisoriginal resultbasis n/a

Claim · model-written summary

C plus A may be a single sequence added to B and B', probably via nonhomologous recombination (author interpretation).

Taxon
maizeZea mayse2
Outcome
C plus Ae5
Qualifier
probably via nonhomologous recombinatione5

Verbatim

e2

“we isolated 59 clones belonging to the TR-1 family from maize and teosinte”

✓ located verbatim in the source · abstract, characters 103–177
e5

“C plus A may be a single sequence that is added to B and B', probably via nonhomologous recombination”

✓ located verbatim in the source · abstract, characters 763–864

Title

Molecular Characterization of a Family of Tandemly Repeated DNA Sequences, TR-1, in Heterochromatic Knobs of Maize and Its Relatives

F C Hsu; C J Wang; C M Chen; et al. Genetics 2003. doi:10.1093/genetics/164.3.1087

Other claims from this paper (8)
Mechanismhypothesisoriginal resultbasis n/a

Claim · model-written summary

The B repeat may be derived from knob repeats in A chromosomes, which then became structurally modified (author interpretation).

Taxon
maizeZea mayse2
Outcome
the B repeate3
Qualifier
derived from knob repeats in A chromosomese3

Verbatim

e2

“we isolated 59 clones belonging to the TR-1 family from maize and teosinte”

✓ located verbatim in the source · abstract, characters 103–177
e3

“suggests that the B repeat is derived from knob repeats in A chromosomes, which subsequently become structurally modified”

✓ located verbatim in the source · abstract, characters 1274–1395

Title

Molecular Characterization of a Family of Tandemly Repeated DNA Sequences, TR-1, in Heterochromatic Knobs of Maize and Its Relatives

F C Hsu; C J Wang; C M Chen; et al. Genetics 2003. doi:10.1093/genetics/164.3.1087

Other claims from this paper (8)
Observationobservedoriginal resultmeasured

Claim · model-written summary

One heterozygous knob containing TR-1 was detected by FISH across the materials tested.

Taxon
maize (Zea mays L.)Zea mayse0
Material
six maize inbred lines and one Z. diploperennis Iltis Doebley linee6
Outcome
heterozygous knob containing TR- 1e2
Value
onee2

Verbatim

e0

“Knobs are blocks of heterochromatin present on chromosomes of maize (Zea mays L.)”

✓ located verbatim in the source · abstract, characters 0–81
e2

“one heterozygous knob containing TR- 1 were captured in chromosomes of all materials tested”

✓ located verbatim in the source · abstract, characters 524–615
e6

“six maize inbred lines and one Z. diploperennis Iltis Doebley line were investigated”

✓ located verbatim in the source · abstract, characters 234–318

Title

Heterozygosity of Knob-Associated Tandem Repeats and Knob Instability in Mitotic Chromosomes of Zea (Zea mays L. and Z. diploperennis Iltis Doebley)

Zhiyong; Xiong; Yong; et al. 植物学报:英文版 2005

Other claims from this paper (3)
Mechanismhypothesisoriginal resultbasis n/a

Claim · model-written summary

69 bp at the 3' end of B or B' and the entire sequence of C can be removed from the elements by an unknown mechanism (author interpretation).

Taxon
maizeZea mayse2
Outcome
69 bp at the 3' end of B or B', and the entire sequence of Ce6
Qualifier
removed from the elements by an unknown mechanisme6

Verbatim

e2

“we isolated 59 clones belonging to the TR-1 family from maize and teosinte”

✓ located verbatim in the source · abstract, characters 103–177
e6

“69 bp at the 3' end of B or B', and the entire sequence of C can be removed from the elements by an unknown mechanism”

✓ located verbatim in the source · abstract, characters 874–991

Title

Molecular Characterization of a Family of Tandemly Repeated DNA Sequences, TR-1, in Heterochromatic Knobs of Maize and Its Relatives

F C Hsu; C J Wang; C M Chen; et al. Genetics 2003. doi:10.1093/genetics/164.3.1087

Other claims from this paper (8)
Observationobservedoriginal resultmeasured

Claim · model-written summary

TR-1 family members are composed of three basic sequences (A, B or B', 2/3B or 2/3B', C) arranged in combinations that give repeat units of about 180 bp multiples.

Taxon
maize and teosintee2
Outcome
basic sequencese1

Verbatim

e1

“members of this family are composed of three basic sequences, A (67 bp); B (184 bp) or its variants B' (184 bp), 2/3B (115 bp), 2/3B' (115 bp); and C (108 bp), which are arranged in various combinations to produce repeat units that are multiples of approximately 180 bp”

✓ located verbatim in the source · abstract, characters 238–507
e2

“we isolated 59 clones belonging to the TR-1 family from maize and teosinte”

✓ located verbatim in the source · abstract, characters 103–177

Title

Molecular Characterization of a Family of Tandemly Repeated DNA Sequences, TR-1, in Heterochromatic Knobs of Maize and Its Relatives

F C Hsu; C J Wang; C M Chen; et al. Genetics 2003. doi:10.1093/genetics/164.3.1087

Other claims from this paper (8)
Observationobservedoriginal resultmeasured

Claim · model-written summary

One target cell showed two TR-1 signals on one homolog of chromosome 2L in maize inbred line GB57, unlike normal cells; this suggests knob duplication and instability.

Taxon
maizeZea mayse0
Material
maize inbred line GB57e4
Organ / stage
one homolog of chromosome 2Le4
Gene
TR-1e4
Outcome
two TR-1 signalse4
Value
one target celle4
Qualifier
suggesting knob duplication and an instability phenomenon in the maize genomee5

Verbatim

e0

“Knobs are blocks of heterochromatin present on chromosomes of maize (Zea mays L.)”

✓ located verbatim in the source · abstract, characters 0–81
e4

“one target cell with two TR-1 signals on one homolog of chromosome 2L, which was different from the normal cells in the maize inbred line GB57”

✓ located verbatim in the source · abstract, characters 784–926
e5

“suggesting knob duplication and an instability phenomenon in the maize genome”

✓ located verbatim in the source · abstract, characters 941–1018

Title

Heterozygosity of Knob-Associated Tandem Repeats and Knob Instability in Mitotic Chromosomes of Zea (Zea mays L. and Z. diploperennis Iltis Doebley)

Zhiyong; Xiong; Yong; et al. 植物学报:英文版 2005

Other claims from this paper (3)

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