The gene recombination-defective is referred to in FlyBase by the symbol Dmel\rec (CG31293, FBgn0003227). It is a protein_coding_gene from Drosophila melanogaster. Based on sequence similarity, it is predicted to have molecular function: ATP-dependent DNA helicase activity. There is experimental evidence that it is involved in the biological process: reciprocal meiotic recombination. 9 alleles are reported. No phenotypic data is available. It has 2 annotated transcripts and 2 annotated polypeptides. Protein features are: Mini-chromosome maintenance, DNA-dependent ATPase; Nucleic acid-binding, OB-fold. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of moderate 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 eye, adult male accessory gland. Comments on Affy2 ProbeSet: ProbeSet 1625964_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of rec. Gene sequence location is 3R:11648741..11658354.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
rec: recombination defective (R.F. Grell)
Recombination in homozygous females drastically
reduced; total cross over between y and f in the X chromosome
reduced from 56% to 2% with distal recombination being more
severely affected than proximal. X nondisjunction increased
from virtually 0 to 27%. In rec1/rec2, females show a similar
reduction for ten regions between al and sp, where crossing
over decreases to 9.1%, corresponding to 9% of normal. The
number of progeny per homozygous female is reduced 75%; attributed to lethality of nondisjunctional products arising from
distributive pairing between noncrossover heterologues.
Phenotype of rec/+ is the same as wild-type; rec1 and rec2
homozygotes and hemizygotes have equivalent effects on recombination.
rec3
At 17 recombination in rec3/+, rec3/rec3, and
rec3/Df(3R)sbd105 is elevated. At 25, the homozygote and the
heterozygote display normal values, but recombination in the
hemizygote is significantly reduced. At 31, rec3/+ remains
normal but rec3/rec3 recombination is drastically reduced.
The hemizygote is sterile above 28. In rec2/rec3 females
which show the most extreme temperature responses, application
of the restrictive temperature at sequential days during
development at 25 shows control value activity to be reduced
only with treatment on days six and seven, and more precisely
during a 36-hour period beginning at the time of pro-oocyte
formation between 126 and 132 hours and terminating at 162
hours. This 36-hour period coincides with the boundaries of
the S period as well as those of the heat-sensitive period for
enhancing recombination in the normal genotype [Grell and Day,
1974, Mechanisms in Recombination (R. F. Grell, ed.). Plenum
Press, New York and London, pp. 327-49]. Activity of the rec
gene product in the range of 17 to 31 shows a sharp decline
between 28 and 31 typical of a protein denaturation curve. If
denaturation of a rec protein by the restrictive temperature
marks its active phase, then recombination must terminate at
the end of S, when the restrictive temperature becomes ineffective. Electron microscopy of serially sectioned oocyte
nuclei from rec2/rec3 females maintained at the restrictive or
at the permissive temperature reveals synaptonemal complexes
indistinguishable in length and fine structure, implicating
recombination and not synapsis as the target of the rec gene
product.
Recent Updates
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FB2013_03
FB2013_02
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Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult eye, adult male accessory gland.
[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
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
None
Low
Moderate
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
54.375
Larval Midgut
4.1
Larval Hindgut
8.5
Larval Malpighian Tubules
8.3
Larval Fat Body
8.2
Larval Salivary Gland
5.7
Larval Trachea
15.625
Larval Carcass
10.675
Adult Head
47
Adult Eye
174.775
Adult Brain
69.3
Adult Thoracic-Abdominal Ganglion
95
Adult Crop
14.9
Adult Midgut
4.7
Adult Hindgut
25.6
Adult Malpighian Tubules
5.3
Adult Fat Body
10.5
Adult Salivary Gland
12.4
Adult Heart
7.825
Adult VirginFemale Spermatheca
14.8
Adult InseminatedFemale Spermatheca
12.6
Adult Ovary
58.9
Adult Testis
6.8
Adult Male Accessory Gland
270.1
Adult Carcass
13.5
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 moderate 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 ( 7 )
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.
Not allelic to c(3)G, since rec and c(3)G fully complement, also unlike c(3)G, rec has no discernible effect on the synaptonemal complex.
Other Comments
Recombination in homozygous females drastically reduced; total cross over between y and f in the X chromosome reduced from 56% to 2% with distal recombination being more severely affected than proximal. X nondisjunction increased from virtually 0 to 27%. In rec1/rec2, females show a similar reduction for ten regions between al and sp, where crossing over decreases to 9.1%, corresponding to 9% of normal. The number of progeny per homozygous female is reduced 75%; attributed to lethality of nondisjunctional products arising from distributive pairing between noncrossover heterologues. Phenotype of rec/+ is the same as wild-type; rec1 and rec2 homozygotes and hemizygotes have equivalent effects on recombination.