The gene no distributive disjunction is referred to in FlyBase by the symbol Dmel\nod (CG1763, FBgn0002948). It is a protein_coding_gene from Drosophila melanogaster. There is experimental evidence that it has the molecular function: microtubule plus-end binding; microtubule motor activity. There is experimental evidence that it is involved in the biological process: meiotic chromosome segregation; spindle assembly involved in female meiosis I; distributive segregation; establishment of meiotic spindle orientation; mitotic spindle organization; positive regulation of microtubule polymerization. 38 alleles are reported. The phenotype of these alleles is annotated with: polytene chromosome chromocenter. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: Helix-hairpin-helix DNA-binding motif, class 1; Kinesin, motor domain; Kinesin, motor region, conserved site. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of high expression to a trough of very low expression. Peak expression observed within 00-06 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult ovary. Comments on Affy2 ProbeSet: ProbeSet 1639689_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of nod. Gene sequence location is X:11474805..11479783.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
nod: no distributive disjunction (R.S. Hawley)
Females homozygous for nod alleles exhibit high frequencies of meiotic chromosome loss and nondisjunction at
meiosis I. Most nod-induced nondisjunctional events involve
nonexchange chromosomes. For example, in nod/nod females nondisjunction frequencies for the always nonexchange fourth
chromosomes approaches 90% (the vast majority of gametes are
nullo-4 ova), whereas nonexchange X chromosomes apparently
disjoin at random. Both the frequency of exchange and the
disjunction of exchange bivalents was shown to be normal in
nod/nod females. Thus, with respect to its role in meiosis,
the nod+ function appears to be limited to the distributive
segregation system. Based on an analysis of secondary nondisjunction in noda/noda females, Carpenter concluded that the
nod defect does not impair the process of partner choice
within the distributive system, but rather specifically
impairs the disjunctional process. Nonexchange chromosomes
derived from noda/noda mothers also undergo nondisjunction,
and presumably loss, at meiosis II. In addition, chromosomes
derived from noda/noda mothers are mitotically unstable.
nod-induced mitotic chromosome loss is restricted to maternal
nonexchange chromosomes and does not exert any discernable
effect on meiosis in males or on mitotic chromosome stability
(Baker et al., 1978). Although none of the existing nod
alleles is lethal or female sterile, the dosage-sensitive
antimorphic mutation l(1)TW6 (Wright, 1973) is argued to be
allelic to nod on the basis of three lines of evidence.
First, l(1)TW6/+ females display a meiotic phenotype that is
virtually identical to that exhibited by noda/noda females.
Second, the two loci map to the same position on the X chromosome (Wright, 1973; Baker). Third, a γ-ray induced revertant
of l(1)TW6 was shown to be a recessive nod allele (New and
Hawley).
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nod transcripts are detected in the germarium and in oogenesis stages S1-S3. Expression is again observed in stage S9-S12 egg chambers primarily in the nurse cell cytoplasm. By stage 12, the nurse cells have degenerated and nod transcripts are detected in the ooplasm. nod transcripts are detected throughout development with significantly higher levels in embryos and adult females than in other stages.
Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult ovary.
[download data (TSV)]
Guide to FlyAtlas expression level colors
No expression (0 - 9.999)
Low expression (10 - 99.999)
Moderate expression (100 - 499.999)
High level expression (500 - 999.999)
Very high expression (>999.999)
Linear, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
High
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
79.275
Larval Midgut
10
Larval Hindgut
20.7
Larval Malpighian Tubules
10.1
Larval Fat Body
16.1
Larval Salivary Gland
11.8
Larval Trachea
27
Larval Carcass
19.125
Adult Head
16.7
Adult Eye
33.275
Adult Brain
15.2
Adult Thoracic-Abdominal Ganglion
22.7
Adult Crop
37.3
Adult Midgut
11.9
Adult Hindgut
20.2
Adult Malpighian Tubules
11.8
Adult Fat Body
25.9
Adult Salivary Gland
20.4
Adult Heart
16.475
Adult VirginFemale Spermatheca
18.1
Adult InseminatedFemale Spermatheca
14.4
Adult Ovary
453.7
Adult Testis
10.9
Adult Male Accessory Gland
20.7
Adult Carcass
35.3
Expression Level Scale
None
Low
Moderate
High
Very high
Heatmap
Tissue
Expression Level
Larval Central Nervous System
Larval Midgut
Larval Hindgut
Larval Malpighian Tubules
Larval Fat Body
Larval Salivary Gland
Larval Trachea
Larval Carcass
Adult Head
Adult Eye
Adult Brain
Adult Thoracic-Abdominal Ganglion
Adult Crop
Adult Midgut
Adult Hindgut
Adult Malpighian Tubules
Adult Fat Body
Adult Salivary Gland
Adult Heart
Adult VirginFemale Spermatheca
Adult InseminatedFemale Spermatheca
Adult Ovary
Adult Testis
Adult Male Accessory Gland
Adult Carcass
FlyAtlas Organ/Tissue Expression, larval vs. adult
Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of high expression to a trough of very low expression. Peak expression observed within 00-06 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 79 )
Please Note
This section lists
cDNAs and ESTs that fall within the genomic extent
of the gene model, which may include cDNAs and ESTs
of genes within introns, or of overlapping genes.
Please see GBrowse for alignment of the cDNAs and ESTs
to the gene model.
RNAi screen using dsRNA made from templates generated with primers directed against this gene results in chromosome misalignment on the metaphase spindle when assayed in S2 cells. This phenotype can be observed when the screen is performed with or without Cdc27 dsRNA.
nod, a female-specific gene expressed in the ovary, is closely linked to roX2, a gene encoding an RNA with no apparent reading frame that shows male-specific expression in the adult fly.
nod is necessary for chromosome segregation and can interact specifically with the centromere. nod requires extracentromeric regions for its action in chromosome segregation.
Examination of meiotic prophase in nod mutants reveals that while heterochromatic pairing may be a component of the mechanism of homologous segregation, it is not sufficient to guarantee proper disjunction of nonexchange homologs.
The nonmotor domain of the nod protein can mediate direct binding to DNA. During prometaphase nod protein is localized on oocyte chromosomes and is not restricted to either specific chromosomal regions or to the kinetochore. Thus motor-based chromosome-microtubule interactions are not limited to the centromere but extend along the chromosome arms, providing a molecular explanation for the polar ejection force.
nod is required for the correct segregation of the non-exchange chromosomes during meiosis, mutations result in a high level of nondisjunction of the non-exchange fourth chromosomes and achiasmate X chromosomes.
Transmission of the Dp(1;f)1187 minichromosome is sensitive to the dosage of nod+. Multiple regions of Dp(1;f)1187 interact with nod+ to promote normal chromosome transmission. Most nod+ interactions are observed with regions that are not essential for centromere function.
nod protein is a member of the kinesin superfamily so it is proposed that the nod locus encodes a spindle motor that is required to hold distributively paired chromosomes at the metaphase plate until anaphase.
Females homozygous for nod alleles exhibit high frequencies of meiotic chromosome loss and nondisjunction at meiosis I. Most nod-induced nondisjunctional events involve nonexchange chromosomes. For example, in nod/nod females nondisjunction frequencies for the always nonexchange fourth chromosomes approaches 90% (the vast majority of gametes are nullo-4 ova), whereas nonexchange X chromosomes apparently disjoin at random. Both the frequency of exchange and the disjunction of exchange bivalents was shown to be normal in nod/nod females. Thus, with respect to its role in meiosis, the nod+ function appears to be limited to the distributive segregation system. Based on an analysis of secondary nondisjunction in noda/noda females, Carpenter concluded that the nod defect does not impair the process of partner choice within the distributive system, but rather specifically impairs the disjunctional process. Nonexchange chromosomes derived from noda/noda mothers also undergo nondisjunction and presumably loss, at meiosis II. In addition, chromosomes derived from noda/noda mothers are mitotically unstable. nod-induced mitotic chromosome loss is restricted to maternal nonexchange chromosomes and does not exert any discernible effect on meiosis in males or on mitotic chromosome stability (Baker, Carpenter and Ripoll, 1978). Although none of the existing nod alleles is lethal or female sterile, the dosage-sensitive antimorphic mutation l(1)TW6 (Wright, 1973) is argued to be allelic to nod on the basis of three lines of evidence. First, l(1)TW6/+ females display a meiotic phenotype that is virtually identical to that exhibited by noda/noda females. Second, the two loci map to the same position on the X chromosome (Wright, 1973; Baker). Third, a γ-ray induced revertant of l(1)TW6 was shown to be a recessive nod allele (New and Hawley).