The gene meiotic 218 is referred to in FlyBase by the symbol Dmel\mei-218 (CG8923, FBgn0002709). It is a protein_coding_gene from Drosophila melanogaster. Its molecular function is unknown. There is experimental evidence that it is involved in the biological process: female meiosis chromosome segregation; reciprocal meiotic recombination. 21 alleles are reported. The phenotypes of these alleles are annotated with: oocyte; cell cycle. It has 4 annotated transcripts and 4 annotated polypeptides. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of moderately high expression to a trough of very low expression. Peak expression observed in adult male stages. This gene is annotated by FlyBase as a dicistronic gene, meaning that some or all of its transcripts encode two or more polypeptide-coding open reading frames (ORFs) , with each ORF assigned to a different gene. The distribution of RNA-Seq coverage data amongst the different encoded genes cannot be determined. Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult testis. Comments on Affy2 ProbeSet: ProbeSet 1626387_s_at aligns to a genomic region shared by exons of 2 FlyBase-annotated genes; hence it is impossible to interpret the expression pattern and levels of mei-218 expression signal. See the GBrowse view of mei-218 to determine the overlapping gene(s). Gene sequence location is X:17030018..17037029.
User Contributed Data
Phenotypic Description from the Red Book (Lindsley
& Zimm 1992)
Gene/Allele symbols may differ
from current usage
mei-218 (R.S. Hawley)
Females homozygous for mei-218 exhibit reduced levels of meiotic exchange. The residual exchanges are distributed such that the probability of euchromatic exchange
becomes more nearly proportional to the polytene-chromosome
length (Baker and Carpenter, 1972; Carpenter and Sandler,
1974; Baker and Hall, 1976). This relaxation of the normal
constraints on the distribution of euchromatic exchange is
clearly demonstrated by the ability of mei-218 females to
allow exchange between the normally achiasmate fourth chromosomes (Sandler and Szauter, 1978). mei-218 does not, however,
permit exchanges to occur in heterochromatic intervals (Carpenter and Baker, 1982). Ultrastructural analysis of pachytene in mei-218 and mei-2186-7 females demonstrates a reduced
number of late recombination nodules (to about 8% of normal),
which are distributed in a fashion that parallels the residual
exchange events (Carpenter, 1979, 1989). Many of the nodules
which are observed are morphologically abnormal. There is
also some evidence that early recombination nodules may be
either fewer in number or more ephemeral in mei-218 females
(Carpenter, 1989). Although mei-218 alleles reduce the frequency of reciprocal meiotic exchange, the absolute frequency
of gene conversion at the rosy locus is two-fold elevated
relative to wild-type controls (Carpenter, 1982, 1984). Moreover, co-conversion distances are shorter than those recovered
from controls or from mei-9 females (Carpenter, 1984). Thus
the function of this locus is required for the generation of
reciprocal exchanges and not for gene conversion (Carpenter,
1984). The reduced levels of reciprocal exchange which are
characteristic of mei-218 females allow for high frequencies
of meiotic loss and nondisjunction (see Baker and Hall, 1976).
Nondisjunction occurs at the first meiotic division and only
nonexchange chromosomes nondisjoin (Carpenter and Sandler,
1974). All assays for an effect of mei-218 on mitotic chromosome behavior in males or on somatic chromosome behavior are
negative (Baker and Carpenter, 1972; Baker et al., 1978;
Lutken and Baker, 1979; Gatti, 1979).
Recent Updates
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Summary of FlyAtlas Anatomical Expression Data: Expression at moderate levels in the following post-embryonic organs or tissues: adult testis.
[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
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
None
Low
Moderate
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
None
Low
Moderate
High
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
18.55
Larval Midgut
6.1
Larval Hindgut
5.4
Larval Malpighian Tubules
2.6
Larval Fat Body
53.3
Larval Salivary Gland
3.2
Larval Trachea
5.4
Larval Carcass
5.6
Adult Head
3.7
Adult Eye
1.625
Adult Brain
5
Adult Thoracic-Abdominal Ganglion
7.2
Adult Crop
13.4
Adult Midgut
11
Adult Hindgut
7.8
Adult Malpighian Tubules
3.6
Adult Fat Body
6.2
Adult Salivary Gland
4.6
Adult Heart
4.25
Adult VirginFemale Spermatheca
1.7
Adult InseminatedFemale Spermatheca
4.4
Adult Ovary
64
Adult Testis
301
Adult Male Accessory Gland
10.4
Adult Carcass
12.1
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 moderately high expression to a trough of very low expression. Peak expression observed in adult male stages. This gene is annotated by FlyBase as a dicistronic gene, meaning that some or all of its transcripts encode two or more polypeptide-coding open reading frames (ORFs) , with each ORF assigned to a different gene. The distribution of RNA-Seq coverage data amongst the different encoded genes cannot be determined.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 25 )
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.
Dicistronic annotation CG33067 split out into separate annotations for each open reading frame, CG33935 and CG8923, in release 4.2 of the genome annotation. CG33935 corresponds to mei-217 and CG8923 corresponds to mei-218.
One or more of the processed transcripts for this gene contain(s) two non-overlapping open reading frames (ORFs). The non-overlapping ORFs are represented by mei-217 and mei-218