The gene Laminin A is referred to in FlyBase by the symbol Dmel\LanA (CG10236, FBgn0002526). It is a protein_coding_gene from Drosophila melanogaster. An electronic pipeline based on InterPro domains suggests that it has the molecular function: receptor binding. There is experimental evidence for 12 unique biological process terms, many of which group under: single-organism developmental process; system development; post-embryonic organ morphogenesis; immune response; growth; locomotory behavior; cell cycle; cellular component organization or biogenesis; neuromuscular process; biological regulation. 30 alleles are reported. The phenotypes of these alleles are annotated with: organ system subdivision; organ system; peripheral nervous system; external compound sense organ; adult segment; non-connected developing system; adult; extracellular matrix; adult trachea; late extended germ band embryo. It has one annotated transcript and one annotated polypeptide. Protein features are: Concanavalin A-like lectin/glucanase, subgroup; Concanavalin A-like lectin/glucanases superfamily; EGF-like, conserved site; EGF-like, laminin; Laminin B type IV; Laminin B, subgroup; Laminin G domain; Laminin I; Laminin II; Laminin, N-terminal. Summary of modENCODE Temporal Expression Profile: Temporal profile ranges from a peak of very high expression to a trough of low expression. Peak expression observed within 06-24 hour embryonic stages. Summary of FlyAtlas Anatomical Expression Data: Many larval and adult organs/tissues expressed at moderate or high levels. Expression at high levels in the following post-embryonic organs or tissues: larval hindgut, adult heart, larval fat body. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, larval/adult central nervous system, adult crop, larval/adult midgut, adult hindgut, larval Malpighian tubules, adult fat body, larval salivary gland, larval trachea, adult ovary, adult male accessory gland, larval/adult carcass. Comments on Affy2 ProbeSet: ProbeSet 1641324_at completely aligns to an exonic region of the only FlyBase-annotated transcript isoform of LanA. Gene sequence location is 3L:6196931..6211122.
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LanA transcripts are detected in 4-6hr embryos, peak at 10-12hr, and then decline. Later peaks occur in early larvae, and late pupae. Developmental increases in Laminin transcripts are associated with periods of morphogenesis and precede those of Cg25C transcripts. Laminin transcripts appear in newly formed mesoderm and are later expressed in fat body, in some glial cells and prominantly in hemocytes found distributed around many organs where basement membrane deposition occurs such as brain, nerve cord, sensory organs, and various internal organs. LanA transcripts are detected at a lower level than LanB1 and LanB2 transcripts.
LanA expression is first detected during germ band extension in the mesoderm and at lower levels in the ectoderm including the neurogenic region. At ~8hr, the level of LanA expression dramatically increases in both the somatic and visceral mesoderm and expression in these tissues continues through the rest of embryonic development. At 8hr, expression in the ectoderm also increases but mainly in the epidermis and not in ectodermal derivatives such as the salivary glands and the CNS. The only LanA expression in the CNS is found along the midline. The interface glia were also tentatively identified as a site of LanA expression. The patterns of expression of LanA, LanB1, and LanB2 are nearly identical.
In dissected embryos between 10-13 hours of development, LanA is detected in basement membrane throughout the embryo. These include basement membranes covering the inside of the epidermis, developing muscles, gut, and internal glands and organs. LanA is also detected in the dorsal basement membrane overlying the developing CNS and in a prominent pair of mesodermal cells just dorsal to the nervous system. The most striking staining in the developing CNS is seen along the axon pathways, including the longitudinal pathways, the commissural pathways, and the peripheral nerve roots. The glia around the peripheral nerve roots also stain. Staining is also observed surrounding clusters of peripheral sensory organs and their support cells. All three Laminin subunits show similar patterns of staining.
LanA protein is detected in embryonic hemocytes and fat body. In later embryos, LanA protein is observed in basement membranes surrounding the nerve cord, brain, gut, spiracles, sensory bodies, and muscles.
Summary of FlyAtlas Anatomical Expression Data: Many larval and adult organs/tissues expressed at moderate or high levels. Expression at high levels in the following post-embryonic organs or tissues: larval hindgut, adult heart, larval fat body. Expression at moderate levels in the following post-embryonic organs or tissues: adult head, larval/adult central nervous system, adult crop, larval/adult midgut, adult hindgut, larval Malpighian tubules, adult fat body, larval salivary gland, larval trachea, adult ovary, adult male accessory gland, larval/adult carcass.
[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
306.25
Larval Midgut
156.7
Larval Hindgut
1476.4
Larval Malpighian Tubules
376.8
Larval Fat Body
1076.5
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
(1476.4)
Larval Malpighian Tubules
376.8
Larval Fat Body
(1076.5)
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
(656.475)
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
None
Low
Moderate
High
Linear, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
(1476.4)
Larval Malpighian Tubules
376.8
Larval Fat Body
1076.5
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
None
Low
Moderate
High
Very high
Linear, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
1476.4
Larval Malpighian Tubules
376.8
Larval Fat Body
1076.5
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
Very high
log, scaled to maximum expression level
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
1476.4
Larval Malpighian Tubules
376.8
Larval Fat Body
1076.5
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Moderate expression
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
(1476.4)
Larval Malpighian Tubules
376.8
Larval Fat Body
(1076.5)
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
None
Low
Moderate
High
log, scaled to High level expression
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
1476.4
Larval Malpighian Tubules
376.8
Larval Fat Body
1076.5
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
Expression Level Scale
None
Low
Moderate
High
Very high
log, scaled to Very high expression
Tissue
Expression Level
Larval Central Nervous System
306.25
Larval Midgut
156.7
Larval Hindgut
1476.4
Larval Malpighian Tubules
376.8
Larval Fat Body
1076.5
Larval Salivary Gland
106.7
Larval Trachea
434.4
Larval Carcass
491.25
Adult Head
132.8
Adult Eye
29.475
Adult Brain
79.2
Adult Thoracic-Abdominal Ganglion
179.1
Adult Crop
375.4
Adult Midgut
118.3
Adult Hindgut
187.7
Adult Malpighian Tubules
98.6
Adult Fat Body
108.7
Adult Salivary Gland
18.8
Adult Heart
656.475
Adult VirginFemale Spermatheca
37.2
Adult InseminatedFemale Spermatheca
59.8
Adult Ovary
199.3
Adult Testis
61.5
Adult Male Accessory Gland
305.4
Adult Carcass
172
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 very high expression to a trough of low expression. Peak expression observed within 06-24 hour embryonic stages.
[download data (TSV)]
Please Note FlyBase no
longer curates genomic clone accessions so this list
may not be complete
cDNA Clones ( 113 )
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.
In a sample of 79 genes with multiple introns, 33 showed significant heterogeneity in G+C content among introns of the same gene and significant positive correspondence between the intron and the third codon position G+C content within genes. These results are consistent with selection adding against preferred codons at the start of genes.
Chain-specific polyclonal antibodies reveal that LanB1 and LanB2 form a stable dimer before they are disulfide-bonded to each other. LanA associates with neither monomeric LanB1, monomeric LanB2 nor LanB1LanB2 dimer without disulfide-bonding but only with disulfide-bonded LanB1LanB2 dimer to form LanALanB1LanB2 trimers. Results demonstrate that the interchain disulfide-bonding between LanB1 and LanB2 is essential for LanALanB1LanB2 trimer formation.
LanA demonstrates evolutionary conservation of binding properties similar to mammalian laminin. LanA binds mammalian nidogen and perlecan, similar proteins may exist in Drosophila.
Examination of mutant embryos and the function of Msp-300 during embryonic muscle development suggests a functional link between LanA and Msp-300 in the development of the embryonic somatic musculature.
LanA function is not required for the early phases of mesoderm patterning and morphogenesis in embryos at the extended germ band stage. Function is required for the proper morphogenesis of the heart, somatic mesoderm and gut during later stages of embryonic development. The endoderm fails to undergo the initial columnar polarisation in the absence of functional LanA. These results indicate that the primary function of LanA is to provide structural support for the various cell types, enabling their proper organisation into the various organs.
The three Laminin genes (LanA, LanB1 and LanB2) encode the three subunits of Drosophila laminin, which associate to form a cruciform molecule in which the carboxy-terminal ends are α helical and associate with one another and whose amino-terminal ends are free to form three short arms of the cross.
The three Laminin genes (LanA, LanB1 and LanB2) encode the three subunits of laminin, a substrate adhesion molecule shown to be a potent promoter of neurite outgrowth.