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|Coordinate||80,730,042 bp (GRCm38)|
|Base Change||G ⇒ T (forward strand)|
|Gene Name||adaptor-related protein complex 3, delta 1 subunit|
|Chromosomal Location||80,706,978-80,742,211 bp (-)|
|MGI Phenotype||Mutations show coat and eye color dilution, platelet defects, lysosomal abnormalities, inner ear degeneration and neurological defects. They model Hermansky-Pudlak storage pool deficiency syndrome.|
|Amino Acid Change||Alanine changed to Glutamic Acid|
|Institutional Source||Beutler Lab|
|Gene Model||predicted sequence gene model|
AA Change: A97E
|Predicted Effect||probably damaging
PolyPhen 2 Score 1.000 (Sensitivity: 0.00; Specificity: 1.00)
|Phenotypic Category||pigmentation, skin/coat/nails|
|Alleles Listed at MGI|
|Mode of Inheritance||Unknown|
|Local Stock||Live Mice|
|Last Updated||05/13/2016 3:09 PM by Anne Murray|
|Record Created||11/18/2013 12:28 PM by Jennifer Weatherly|
The christian phenotype was initially identified among N-ethyl-N-nitrosourea (ENU)-mutagenized G3 animals and is characterized by coat hypopigmentation (Figure 1). The christian homozygous mice have a gray coat.
|Nature of Mutation|
Whole exome HiSeq sequencing of the G1 grandsire identified 126 mutations, one of which affected Ap3d1, a gene known to affect coat pigmentation (1). The coat color of christian homozygotes resembles that of Ap3d1 mutant mice [Ap3d1mh-2J; MGI:1856084; (2)], strongly suggesting that the Ap3d1 mutation is causative for the christian phenotype. The Ap3d1 mutation is a C to A transversion at base pair 80,730,042 (v38) on Chromosome 10, or 12,170 in the GenBank genomic region NC_000076 encoding Ap3d1. The mutation corresponds to residue 510 in the mRNA sequence NM_007460 within exon 4 of 31 total exons.
The mutated nucleotide is indicated in red. The mutation results in an alanine (A) to glutamic acid (E) substitution at amino acid 97.
Ap3d1 encodes the delta (δ) subunit (alternatively, δ-adaptin) of the adaptor protein 3 (AP-3) complex. AP-3 is one of four heterotetrameric adaptor protein complexes (i.e., AP-1 to AP-4) that regulate vesicle biogenesis in the endosomal and lysosomal pathways as well as cargo selection and subcellular trafficking of membrane cargo proteins (3-6). The AP-3 complex is comprised of the δ subunit, a large chain beta (β3) subunit (alternatively, β-NAP; see the record for bullet gray), a medium chain mu (μ3) subunit (alternatively, p47), and a small chain sigma (σ3) subunit [Figure 2; (4;7-13)]. β3, μ3, and σ3 each exist as two isoforms (β3A and β3B; μ3A and μ3B; σ3A and σ3, respectively (14); the δ subunit does not have two isoforms (12;14). AP-3 can form two different complexes, AP-3A and AP-3B, that have unique expression patterns; see “Expression and Localization” section for more details on the expression patterns of the AP-3 complexes. The ubiquitously expressed AP-3A complex is comprised of the δ, σ3A/B, β3A, and μ3A subunits, while the neuron-specific AP-3B complex is composed of the δ, σ3A/B, β3B, and μ3B subunits (7;13;14).
Delta-adaptin is homologous to the large chain gamma-1 (γ1)- and alpha-2 (α2)-adaptins of the AP-1 (comprised of γ1, β1, μ1, and σ1 subunits) and AP-2 (comprised of α2, β2, μ2, and σ2 subunits) adaptor complexes, respectively (15-17). However, δ-adaptin is only ~15% identical to the γ1- and α2-adaptins; most identity is restricted to the N-terminus of the proteins (7;8). Delta-adaptin shares high amino acid sequence similarity with the protein product of the Drosophila garnet gene; the proteins share greater than 96% identity at the N-terminus (amino acids 178-287 in δ) (7;8;18). The garnet protein is necessary for the biogenesis of eye color pigment granules.
Similar to other adaptins, δ-adaptin has a three domain structure that consists of an N-terminal core (alternatively, trunk) domain (amino acids 1-582), a highly hydrophilic linker (i.e., hinge domain; amino acids 583-945), and a C-terminal ear domain (amino acids 946-1153) [Figure 3; (7;9)]. Analysis of the C-terminally truncated δ-adaptin in the Ap3d1 mutant mh2J mouse model (see “Background” for more details) determined that the N-terminal half of δ-adaptin is necessary and sufficient for the early steps in AP-3 complex formation and trans-Golgi network (TGN) localization (2). Delta-adaptin has a WI(I/L)GEY consensus sequence within the trunk domain [amino acids 396-401; WICGEF; (7)]. The function of the WI(I/L)GEY motif is unknown, but it is found in the α-, β-, and γ-adaptins as well as in the β-COP subunit of the COP I adaptor-related protein complex (19-21).
The ear domain of δ-adaptin interact with the C-terminus of the σ3 subunit (9). The σ3-δ-trunk portion of the AP-3 complex interacts with [DE]XXXL[LI]-type, dileucine-based sorting signals in cargo proteins, and with GTP bound ADP-ribosylation factor 1 (Arf1) (9;22). Arf1 is localized to the Golgi and is required for intra-Golgi transport as well as the recruitment of AP-3 to membranes (9). The ear domain of δ-adaptin inhibits AP-3 binding to Arf1 and prevents the recruitment of AP-3 to membranes (9). Overexpression of the ear domain of δ-adaptin also interferes with Lamp-1 and CD63 trafficking (9). Lefrancois et al. propose that AP-3 exists in an equilibrium between “closed” and “open” conformations (9). In the closed conformation, the Arf1 binding site on the AP-3 core is covered by the ear region of δ-adaptin in order to block untimely interactions with the Arf1 binding site and preventing AP-3 recruitment to the membrane (9). In the open conformation, the ear domain releases the Arf1 binding site on σ3-δ-trunk, allowing Arf1 binding and subsequent recruitment of AP-3 to the membrane (9).
AP-3 interacts with several proteins through associations with δ-adaptin (Table 1). Amino acids 578-825 (within the ear domain) of δ-adaptin recognizes the YxDxE motif (i.e., an acidic tyrosine-based cytoplasmic sorting motif) of vesicular stomatitis virus glycoprotein (VSV-G), a transmembrane protein that functions as the surface coat of enveloped viral particles; AP-3 assists in the export of VSV-G from the TGN to the cell surface (23). An intact and stable AP-3 complex is required from human immunodeficiency virus type 1 (HIV-1) assembly and release; AP-3 deficiency decreased HIV-1 Gag localization at the plasma membrane and late endosomes (24;25). The findings on an association between Gag and δ-adaptin are conflicting. Earlier studies showed that the protein interactive domain (amino acids 641-742) of δ-adaptin interacted with the matrix domain at the N-terminus of HIV-1 Gag protein to facilitate virus-like particle assembly and the release of virus particles from HIV-1-infected dendritic cells (25;26). However, a later study determined that the HIV-1 matrix protein does not directly interact with the PID domain; this study did not rule out that an interaction between Gag and δ-adaptin may be mediated by other factors not present in the assay used (27). Kyere et al. therefore proposed that δ-adaptin plays an unknown, alternative role to mediating Gag targeting in HIV-1 assembly (27). AP-3 recognizes the tyrosine- and di-leucine-based sorting signals of lysosome-associated membrane proteins (LAMPs) 1 and 2, lysosomal integral membrane protein 2 (LIMP2; alternatively, Scarb2), CD63, and CD1 and the melanosomal protein tyrosinase (Tyr; see the record for ghost) to facilitate the trafficking of these proteins to late endosome/lysosome compartments (5;11;28-33). AP-3B is known to traffic the zinc transporter ZnT3 [alternatively, solute carrier family 30, member 3 (Slc30a3)] in neurons (2;34;35). Loss of AP-3B expression/function in an Ap3d1 null mouse model (see below for more details) leads to deficiency of zinc in synaptic vesicles (12). Newell-Litwa et al. showed that AP-3B determined synaptic vesicle composition and morphology distinctly in diverse brain regions through synaptic vesicle biogenesis regulation (10).
The christian mutation results in the conversion of alanine 97 to glutamic acid within the trunk domain of δ-adaptin.
Ap3d1 is expressed ubiquitously, but highest expression is in the skeletal muscle, heart, pancreas, and testis (7). Within the brain, Ap3d1 is distributed in neuronal, but not white matter, regions of the forebrain, brainstem, and cerebellum (12).
The AP-3A complex is ubiquitously expressed. Neuronal AP-3B is expressed throughout the brain (e.g., amygdala, cortex, hippocampus, and striatum), with abundant expression in the striatum and hippocampus at the pre-synaptic axonal compartments (10;41). AP-3B is also expressed in dendrites, spines, unmyelinated axons, axon terminals, myelinated axons, and glia (10;12).
The AP-3 (both AP-3A and AP-3B) complex is mainly localized to the perinuclear region including in vesicles budding from the TGN, as well as to peripheral endosomes (7;12;13;42;43). In melanocytes, AP-3 is localized to clathrin-coated buds on tubulovesicular elements adjacent to endosomal vacuoles and melanosomes (28).
Trafficking of proteins from a donor to acceptor membrane compartment involves the formation of a transport vesicle, a process mediated by protein complexes such as COP-II, AP-1, AP-2, and AP-3 (7;18;44). The AP complexes facilitate intracellular vesicle transport by interacting with signal motifs in the cytoplasmic domains of transmembrane proteins as well as by recruiting clathrin to form clathrin-coated vesicles and recruiting accessory proteins for vesicle formation (7;45). The AP-1 and AP-3 complexes bud from the TGN, while AP-2 buds from the plasma membrane to concentrate cargo proteins for delivery to endosomal compartments (7).
The AP-3A complex is involved in the biogenesis of lysosome-related organelles (LROs; e.g., platelet-dense granules and melanosomes) by directing the sorting of transmembrane cargo to those organelles (12;30;46;47) as well as the sorting of lysosomal membrane proteins to lysosomes [Figure 4; (5;11;18;46)]. Loss of AP-3 function results in defects of lysosomes and LROs as well as trafficking defects of integral lysosomal membrane proteins [see Table 1; (5;11;29;33;40;46)]. The neuron-specific isoform of AP-3 (AP-3B) mediates the biogenesis of endosome-derived synaptic vesicles and regulates protein sorting to these organelles in diverse brain regions (10;44;48). Loss of AP-3B function resulted in increased synaptic vesicle size in the dentate gyrus; in the striatum, loss of AP-3B resulted in decreased synaptic vesicle size in excitatory synaptic terminals (10). BLOC-1 regulates the brain region-specific effects of AP-3 by forming a complex with AP-3 in brain nerve terminals (10).
The mocha mouse model (Ap3d1mh; MGI:1856083) is a naturally occurring Ap3d1 null mutant. The mocha mutation is an out-of-frame 10,639 base pair deletion corresponding to exons 2 to 6 in Ap3d1 that leads to an in-frame stop codon shortly after the deletion (12;49). Premature truncation of δ-adaptin leads to loss of both the AP-3A and AP-3B isoforms (12). Protein expression analysis of the other subunits of the AP-3 complex (β3, μ3, σ3) determined that each of the subunits were expressed at reduced or undetectable levels (12;49). The mRNA level of σ3A was normal, indicating that the changes in subunit expression were due to protein instability, not mRNA degradation (12;49). In addition, the existing AP-3 complex subunits in mocha assembled into heterodimers composed of the β3 and μ3 subunits; σ3 remained a monomer (18). The mocha model exhibits coat and eye pigment dilution due to melanosome trafficking defects, prolonged bleeding due to platelet dense granule trafficking defects, lytic granule defects in cytotoxic T cells, lysosomal abnormalities, trafficking defects in cytotoxic T lymphocytes and natural killer cell lytic granules, inner ear degeneration and balance problems due to otolith defects and degeneration of the organ of Corti, progressive cochlear degeneration leading to deafness by 3-6 months of age, photoreceptor degeneration leading to blindness by around postnatal day 10-15, neurological defects (i.e., hyperactivity and seizures) due to exocytosis (and possibly turnover) defects in a subset of synaptic vesicles in some neurons, and high perinatal mortality by 4 weeks of age (1;12;41;49-59). The mocha mice resemble mice with defects in the β3 AP-3 subunit (i.e., the pearl (Ap3b1pe (MGI:1856989) and bullet gray models) with the exception of the neurological defects observed only in mocha mice that are caused by changes in the expression of the AP-3B subunits; the pearl neurons express functional β3B-containing complexes (55). A second spontaneous Ap3d1 allele, mocha2J (mh2J; MGI:1856084; (2)), results in a less severe phenotype than observed in mocha mice (12;55;56). The mh2J mutation is an intracisternal A particle (IAP) insertion into intron 21 that results in a C-terminally truncated δ-adaptin protein of 858 amino acids (as opposed to wild type δ-adaptin at 1198 amino acids); small amounts of wild-type protein are expressed in mh2J (2). Homozygous mh2J mice exhibit variable decreased pigmentation of the eyes and coat depending on the genetic background, prolonged bleeding caused by storage pool defects in platelets, and a neurological phenotype of hyperactivity and tonic-clonic behavioral seizures (2). In contrast to the mocha strain, the mh2J mice do not exhibit hearing loss (2).
AP-3 deficiency (often due to loss of δ-adaptin expression as well as mutations in other subunits of the AP-3 complex) is linked to Hermansky-Pudlak Syndrome 2 (HPS2; OMIM: #608233), a condition in which patients exhibit hypopigmentation, prolonged bleeding due to the platelet dense granule deficiency, reduced secretion of lysosomal enzymes into the urine, and pulmonary fibrosis; humans deficient in β3A are neurologically normal (18;60;61). The phenotypes associated with HPS2 are linked to defects in the sorting of membrane proteins from endosomes to lysosomes and LROs (60;61).
Similar to other Ap3d1 mutant mouse models, christian mice exhibit hypopigmentation. Studies using the mocha and mh2J have established that the pigmentation defects are due to a loss of AP-3 function and, subsequently, trafficking defects in melanosomes of pigment cells (1;2;12). Other phenotypes associated with Ap3d1 deficiency have not been examined in the christian mice.
christian(F):5'- ATGTGAAGGCCCATGCTTGCTG -3'
christian(R):5'- TATGAGAACTAGGGTGCTGCCTCC -3'
christian_seq(F):5'- GATCTCTCATCTGCTGAGACACAG -3'
christian_seq(R):5'- GCAATGAAGCTAGAACCATCTG -3'
Christian genotyping is performed by amplifying the region containing the mutation using PCR, followed by sequencing of the amplified region to detect the single nucleotide transition.
Christian(F): 5’- ATGTGAAGGCCCATGCTTGCTG-3’
Christian(R): 5’- TATGAGAACTAGGGTGCTGCCTCC-3’
Christian_seq(F): 5’- GATCTCTCATCTGCTGAGACACAG-3’
Christian_seq(R): 5’- GCAATGAAGCTAGAACCATCTG-3’
1) 94°C 2:00
2) 94°C 0:30
3) 55°C 0:30
4) 72°C 1:00
5) repeat steps (2-4) 40X
6) 72°C 10:00
7) 4°C ∞
The following sequence of 477 nucleotides is amplified (Chr. 10: 80729820-80730296, GRCm38; NCBI RefSeq NC_000076):
atgtgaaggc ccatgcttgc tgagaccaga tctctcatct gctgagacac aggggatatg
agtgagaaag ctttgaaaag ctaccccagg caggtgggac tgtcagctag ctgatctttt
gtggctcact tgagtggcag gaaagcatca gggcctacct ttcggatctg gttggtggtc
agcatgatga cgtcggtacc ttcatggaag cactgggagg ccgcaaggta gccaacacgc
tgcagagtca acagccacag tgtcagaacc agagctacct aaagccccac caggagcact
caacaaacac cgggaaacac tgagggtgac agcagcaggg cacctggatc cccagctgag
cactgggcac agggttctga ggcctcctcc cctactgccc ctcccagcac atgcagatgg
ttctagcttc attgctgtac acacatgcac aggggaggca gcaccctagt tctcata
Primer binding sites are underlined and the sequencing primer is highlighted; the mutated nucleotide is shown in red text (G>T, Chr. + strand (shown); C>A, sense strand).
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|Science Writers||Anne Murray|
|Illustrators||Diantha La Vine, Peter Jurek|
|Authors||Jennifer Weatherly Tiana Purrington|
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