| 1998 |
A missense mutation R116C in CRYAA (alphaA-crystallin) is associated with autosomal dominant congenital cataract, establishing CRYAA as a causative gene for hereditary lens opacity. |
Linkage analysis and gene sequencing in an ADCC family |
Human molecular genetics |
Medium |
9467006
|
| 2008 |
The R116H mutation in alphaA-crystallin increases hydrophobicity of the protein, abolishes chaperone activity in a DTT-induced insulin aggregation assay, and increases binding affinity to lysozyme, indicating loss of normal chaperone function as the molecular basis for cataract formation. |
Recombinant protein expression in E. coli, RP-HPLC (hydrophobicity), FPLC (binding affinity), in vitro chaperone activity assay (insulin aggregation) |
Human mutation |
High |
18407550
|
| 2012 |
CRYAA released from injured keratocytes acts as a DAMP and activates resident macrophages via the TLR2/NF-κB signaling pathway, triggering Phase II sterile corneal inflammation responsible for vision-threatening opacity. This was suppressed in HSPB4-knockout or TLR2-knockout mice, and by anti-HSPB4 antibodies. |
Mouse knockout models (HSPB4-/-, TLR2-/-), antibody inhibition, temporal kinetic analysis of neutrophil infiltration, NF-κB pathway analysis |
EMBO molecular medicine |
High |
22359280
|
| 2012 |
CRYAA expression is epigenetically repressed in age-related nuclear cataract lens epithelia via CpG island hypermethylation of the CRYAA promoter; treatment with the demethylating agent zebularine restores CRYAA mRNA and protein expression. |
Bisulfite genomic sequencing, RT-PCR, Western blot, demethylating agent treatment (zebularine) |
FASEB journal |
Medium |
22889833
|
| 2016 |
Methylation of CpG sites in the CRYAA promoter directly reduces binding of transcription factor Sp1, providing the mechanistic link between promoter hypermethylation and transcriptional silencing of CRYAA. |
Electrophoretic mobility shift assay (EMSA) with methylated vs. unmethylated probes, demethylating agent treatment with qRT-PCR |
BMC ophthalmology |
Medium |
27507241
|
| 2011 |
HspB4 (CRYAA) forms hetero-complexes with HspB5 (alphaB-crystallin), and subunit exchange kinetics between HspB4 and HspB5 are slower than between HspB1 and HspB5. HspB4-HspB5 hetero-complexes exhibit distinct chaperone-like activity and structural properties compared to either homo-oligomer, suggesting that hetero-complex formation expands functional range. |
Biochemical and biophysical characterization (size exclusion chromatography, small-angle X-ray scattering), subunit exchange kinetics, in vitro chaperone activity assays |
Biochimie |
Medium |
22210387
|
| 2018 |
Substitution of the conserved Arg in the N-terminal RLFDQxFG motif of HspB4 (R12 equivalent region) induces only minor changes in thermal stability and oligomeric structure compared to the larger effects seen in HspB1 and HspB8, indicating that this motif plays a distinct, context-dependent structural role in HspB4. |
Biophysical characterization (thermal stability, intrinsic fluorescence, size exclusion chromatography) of recombinant Arg-to-Ala mutant proteins |
International journal of molecular sciences |
Medium |
30036999
|
| 2021 |
HspB4/αA-crystallin phosphorylation at T148 regulates its anti-inflammatory function in retinal Müller glial cells: phosphomimetic T148D mutant significantly reduced expression of pro-inflammatory cytokines (IL-6, IL-1β, MCP-1, IL-18), suppressed NLRP3 inflammasome components, and nearly abolished NF-κB induction, whereas non-phosphorylatable T148A mutant was ineffective. |
Primary Müller glial cells from HSPB4 knockout mice, transfection with WT/T148D/T148A plasmids, qPCR for inflammatory markers, Western blot for NF-κB and NLRP3 subcellular localization |
Journal of clinical medicine |
Medium |
34071438
|
| 2024 |
αA-crystallin (HSPB4) interacts with the neuroprotective protein FAIM2, and this interaction requires phosphorylation of αA-crystallin at T148. During retinal detachment, FAIM2 is induced and co-immunoprecipitates with αA-crystallin, and αA-crystallin stabilizes FAIM2 to promote photoreceptor survival. |
Co-immunoprecipitation, immunohistochemistry, immunoblotting, TUNEL staining, cell culture model with FasL-induced photoreceptor death, phosphomimetic/non-phosphorylatable mutants |
Neurology international |
Medium |
39311341
|
| 2024 |
mTORC2 is identified as a kinase that phosphorylates HSPB4 at T148 in vitro; additionally, the chaperone function of HSPB4 further strengthens the interaction with mTORC2, suggesting a multi-faceted regulatory relationship. |
In vitro kinome profiling, bioinformatics analysis, chemoproteomics, in vitro kinase assay |
Cells |
Medium |
39682748
|
| 2018 |
The R12L mutation in CRYAA causes aggregation of the mutant protein in the insoluble fraction, forms large cytoplasmic aggregates and aggresomes in HeLa cells, and increases overall CRYAA protein expression levels, suggesting that mutation-induced aggregation underlies cataract pathogenesis. |
Transfection of WT and R12L-CRYAA in HEK293T and HeLa cells, Western blotting (solubility), immunofluorescence (aggresome formation) |
BMC medical genetics |
Medium |
30340470
|
| 2021 |
In a CRYAA Y118D mutant mouse model, cataract formation is associated with activation of the endoplasmic reticulum stress-unfolded protein response (ERS-UPR) pathway, with up-regulated ERS-UPR genes; prolonged UPR activation leads to proteotoxic cell death in lens fibers. |
Knock-in mouse model, histological analysis, transcriptome analysis, key pathway analysis |
Zoological research |
Medium |
33929105
|
| 2023 |
Silencing of CRYAA in HLEB3 lens epithelial cells increases apoptosis and autophagy, demonstrating that CRYAA is required to suppress apoptotic and autophagic pathways in lens epithelial cell homeostasis. |
siRNA knockdown, Western blotting for apoptosis and autophagy markers, flow cytometry, CCK-8 viability assay |
Aging |
Low |
37253645
|
| 2025 |
CRYAA overexpression in RPE cells reduces miR-155-5p levels, which in turn de-represses SIRT1 (confirmed by dual luciferase assay showing miR-155-5p binds SIRT1 3'-UTR), leading to activation of the PI3K/AKT signaling pathway and protection from H2O2-induced apoptosis. |
Stable overexpression in ARPE-19 cells, RT-qPCR, dual luciferase reporter assay, Western blotting for PI3K/AKT pathway, flow cytometry for apoptosis, in vivo mouse retinal degeneration model with AAV-Cryaa injection |
Archives of biochemistry and biophysics |
Medium |
40350053
|
| 2023 |
The E156K mutation in CRYAA induces epithelial-mesenchymal transition (EMT) in human lens epithelial cells, increasing mesenchymal markers (N-cadherin, vimentin) and decreasing epithelial marker (E-cadherin), with enhanced cell migration via activation of FAK/Src and Wnt/β-catenin signaling pathways. |
Knockdown and replacement with WT or E156K-mutant CRYAA in HLECs, Western blotting for EMT markers, rhodamine cytoskeleton staining, migration assay, β-catenin inhibitor (ICG001) and FAK/Src inhibitor treatments |
Heliyon |
Medium |
38187316
|
| 2008 |
A 148 kb BAC transgene containing the Cryaa locus recapitulates endogenous alphaA-crystallin expression pattern in the lens. Deletion of the distal control region DCR3 from either the BAC or a 15 kb Cryaa fragment shows that DCR3 functions as a distal enhancer active during late primary lens fiber cell differentiation. |
BAC transgenic mice, standard transgenic mice, EGFP reporter, temporal/spatial expression analysis by fluorescence imaging |
BMC developmental biology |
Medium |
18803847
|
| 2023 |
HSPB4 (CRYAA) activates TLR2 signaling in corneal cells acting as a DAMP; dioleoylphosphatidylglycerol (DOPG) inhibits TLR2 activation induced by HSPB4 in vitro, and this TLR2 activation requires the co-receptor CD14. |
In vitro TLR2 activation assay, CD14 co-receptor requirement established by knockdown/inhibition |
International journal of molecular sciences |
Low |
36982926
|