Incidental Mutation 'A5278:Myo3a'
ID 60
Institutional Source Beutler Lab
Gene Symbol Myo3a
Ensembl Gene ENSMUSG00000025716
Gene Name myosin IIIA
Synonyms 9030416P08Rik
Accession Numbers
Essential gene? Non essential (E-score: 0.000) question?
Stock # A5278 of strain 453
Quality Score
Status Validated
Chromosome 2
Chromosomal Location 22232314-22508264 bp(+) (GRCm39)
Type of Mutation missense
DNA Base Change (assembly) A to G at 22328464 bp (GRCm39)
Zygosity Heterozygous
Amino Acid Change Threonine to Alanine at position 353 (T353A)
Ref Sequence ENSEMBL: ENSMUSP00000046329 (fasta)
Gene Model predicted gene model for transcript(s): [ENSMUST00000044749] [ENSMUST00000153002]
AlphaFold no structure available at present
Predicted Effect probably benign
Transcript: ENSMUST00000044749
AA Change: T353A

PolyPhen 2 Score 0.269 (Sensitivity: 0.91; Specificity: 0.88)
SMART Domains Protein: ENSMUSP00000046329
Gene: ENSMUSG00000025716
AA Change: T353A

DomainStartEndE-ValueType
S_TKc 29 295 1.62e-91 SMART
MYSc 340 1061 2.07e-252 SMART
IQ 1061 1083 2.88e1 SMART
IQ 1088 1110 9.48e-3 SMART
low complexity region 1153 1169 N/A INTRINSIC
low complexity region 1359 1369 N/A INTRINSIC
low complexity region 1496 1505 N/A INTRINSIC
Predicted Effect probably benign
Transcript: ENSMUST00000153002
AA Change: T345A

PolyPhen 2 Score 0.002 (Sensitivity: 0.99; Specificity: 0.30)
SMART Domains Protein: ENSMUSP00000120573
Gene: ENSMUSG00000025716
AA Change: T345A

DomainStartEndE-ValueType
S_TKc 21 287 1.62e-91 SMART
MYSc 332 753 3.06e-35 SMART
Meta Mutation Damage Score 0.1086 question?
Coding Region Coverage
  • 1x: 88.2%
  • 3x: 73.8%
Validation Efficiency 87% (116/134)
MGI Phenotype FUNCTION: [Summary is not available for the mouse gene. This summary is for the human ortholog.] The protein encoded by this gene belongs to the myosin superfamily. Myosins are actin-dependent motor proteins and are categorized into conventional myosins (class II) and unconventional myosins (classes I and III through XV) based on their variable C-terminal cargo-binding domains. Class III myosins, such as this one, have a kinase domain N-terminal to the conserved N-terminal motor domains and are expressed in photoreceptors. The protein encoded by this gene plays an important role in hearing in humans. Three different recessive, loss of function mutations in the encoded protein have been shown to cause nonsyndromic progressive hearing loss. Expression of this gene is highly restricted, with the strongest expression in retina and cochlea. [provided by RefSeq, Jul 2008]
PHENOTYPE: Mice homozygous for a knock-in allele exhibit impaired hearing and cochlear hair cell degeneration. [provided by MGI curators]
Allele List at MGI
Other mutations in this stock
Total: 7 list
GeneRefVarChr/LocMutationPredicted EffectZygosity
Kat14 C A 2: 144,235,227 (GRCm39) S18* probably null Het
Kif17 T C 4: 138,015,261 (GRCm39) V278A probably benign Homo
Pbk T A 14: 66,051,388 (GRCm39) I142N probably damaging Het
Rab32 A G 10: 10,433,717 (GRCm39) I39T possibly damaging Het
Rhou G T 8: 124,387,730 (GRCm39) C154F probably damaging Het
Slc4a1 A G 11: 102,244,641 (GRCm39) probably benign Het
Tdrd7 C T 4: 46,007,622 (GRCm39) T558M probably benign Homo
Other mutations in Myo3a
AlleleSourceChrCoordTypePredicted EffectPPH Score
IGL01014:Myo3a APN 2 22,337,284 (GRCm39) missense probably benign 0.42
IGL01307:Myo3a APN 2 22,448,301 (GRCm39) missense probably damaging 1.00
IGL01413:Myo3a APN 2 22,302,411 (GRCm39) missense probably benign 0.25
IGL01655:Myo3a APN 2 22,428,137 (GRCm39) missense probably damaging 1.00
IGL01767:Myo3a APN 2 22,428,033 (GRCm39) missense probably damaging 0.96
IGL01803:Myo3a APN 2 22,245,926 (GRCm39) missense probably damaging 1.00
IGL01969:Myo3a APN 2 22,302,499 (GRCm39) missense probably benign 0.03
IGL02043:Myo3a APN 2 22,404,776 (GRCm39) missense probably benign 0.01
IGL02124:Myo3a APN 2 22,467,538 (GRCm39) missense probably benign 0.01
IGL02174:Myo3a APN 2 22,337,204 (GRCm39) missense probably benign 0.04
IGL02649:Myo3a APN 2 22,328,418 (GRCm39) missense probably benign
IGL02976:Myo3a APN 2 22,434,494 (GRCm39) nonsense probably null
IGL03328:Myo3a APN 2 22,468,210 (GRCm39) missense probably benign 0.02
IGL03376:Myo3a APN 2 22,490,086 (GRCm39) splice site probably benign
lose UTSW 2 22,448,332 (GRCm39) nonsense probably null
snooze UTSW 2 22,287,445 (GRCm39) missense probably damaging 0.99
PIT4445001:Myo3a UTSW 2 22,434,457 (GRCm39) missense possibly damaging 0.64
R0008:Myo3a UTSW 2 22,469,753 (GRCm39) missense probably damaging 0.99
R0099:Myo3a UTSW 2 22,250,409 (GRCm39) missense probably benign 0.03
R0103:Myo3a UTSW 2 22,436,360 (GRCm39) splice site probably benign
R0103:Myo3a UTSW 2 22,436,360 (GRCm39) splice site probably benign
R0212:Myo3a UTSW 2 22,296,659 (GRCm39) missense probably damaging 1.00
R0281:Myo3a UTSW 2 22,250,409 (GRCm39) missense probably benign 0.03
R0282:Myo3a UTSW 2 22,250,409 (GRCm39) missense probably benign 0.03
R0492:Myo3a UTSW 2 22,328,447 (GRCm39) missense possibly damaging 0.46
R0498:Myo3a UTSW 2 22,467,441 (GRCm39) missense possibly damaging 0.74
R0594:Myo3a UTSW 2 22,436,370 (GRCm39) splice site probably benign
R0609:Myo3a UTSW 2 22,401,110 (GRCm39) missense possibly damaging 0.95
R0609:Myo3a UTSW 2 22,338,324 (GRCm39) missense probably benign 0.29
R0827:Myo3a UTSW 2 22,448,227 (GRCm39) missense probably damaging 1.00
R0968:Myo3a UTSW 2 22,448,301 (GRCm39) missense probably damaging 1.00
R1157:Myo3a UTSW 2 22,434,456 (GRCm39) critical splice acceptor site probably null
R1301:Myo3a UTSW 2 22,271,906 (GRCm39) splice site probably benign
R1352:Myo3a UTSW 2 22,328,486 (GRCm39) critical splice donor site probably null
R1443:Myo3a UTSW 2 22,287,437 (GRCm39) missense probably damaging 0.99
R1465:Myo3a UTSW 2 22,467,939 (GRCm39) missense probably benign 0.00
R1465:Myo3a UTSW 2 22,467,939 (GRCm39) missense probably benign 0.00
R1517:Myo3a UTSW 2 22,287,445 (GRCm39) missense probably damaging 0.99
R1565:Myo3a UTSW 2 22,345,091 (GRCm39) missense probably damaging 1.00
R1712:Myo3a UTSW 2 22,455,004 (GRCm39) missense probably damaging 1.00
R1722:Myo3a UTSW 2 22,404,638 (GRCm39) missense probably benign 0.03
R1822:Myo3a UTSW 2 22,345,091 (GRCm39) missense probably damaging 1.00
R1823:Myo3a UTSW 2 22,345,091 (GRCm39) missense probably damaging 1.00
R1824:Myo3a UTSW 2 22,401,054 (GRCm39) missense probably benign
R1837:Myo3a UTSW 2 22,467,604 (GRCm39) missense possibly damaging 0.76
R1867:Myo3a UTSW 2 22,404,657 (GRCm39) missense probably benign 0.00
R1917:Myo3a UTSW 2 22,296,733 (GRCm39) missense probably damaging 1.00
R1920:Myo3a UTSW 2 22,455,008 (GRCm39) missense probably benign 0.02
R1937:Myo3a UTSW 2 22,401,126 (GRCm39) missense probably damaging 1.00
R1954:Myo3a UTSW 2 22,246,037 (GRCm39) missense probably damaging 1.00
R1988:Myo3a UTSW 2 22,468,140 (GRCm39) missense possibly damaging 0.86
R2091:Myo3a UTSW 2 22,338,488 (GRCm39) missense probably damaging 0.99
R2115:Myo3a UTSW 2 22,250,342 (GRCm39) missense probably damaging 1.00
R2125:Myo3a UTSW 2 22,468,186 (GRCm39) missense probably benign 0.42
R2126:Myo3a UTSW 2 22,468,186 (GRCm39) missense probably benign 0.42
R2216:Myo3a UTSW 2 22,467,783 (GRCm39) missense probably benign 0.00
R2413:Myo3a UTSW 2 22,467,924 (GRCm39) missense probably benign 0.00
R2964:Myo3a UTSW 2 22,345,067 (GRCm39) missense possibly damaging 0.90
R3196:Myo3a UTSW 2 22,404,679 (GRCm39) missense possibly damaging 0.86
R3837:Myo3a UTSW 2 22,455,121 (GRCm39) splice site probably benign
R3905:Myo3a UTSW 2 22,448,227 (GRCm39) missense probably damaging 1.00
R3926:Myo3a UTSW 2 22,455,053 (GRCm39) missense probably damaging 0.99
R4014:Myo3a UTSW 2 22,468,182 (GRCm39) missense possibly damaging 0.76
R4015:Myo3a UTSW 2 22,468,182 (GRCm39) missense possibly damaging 0.76
R4017:Myo3a UTSW 2 22,468,182 (GRCm39) missense possibly damaging 0.76
R4043:Myo3a UTSW 2 22,338,350 (GRCm39) splice site probably benign
R4044:Myo3a UTSW 2 22,467,712 (GRCm39) missense probably damaging 0.99
R4057:Myo3a UTSW 2 22,270,971 (GRCm39) missense probably benign 0.01
R4192:Myo3a UTSW 2 22,412,188 (GRCm39) missense probably damaging 1.00
R4282:Myo3a UTSW 2 22,345,089 (GRCm39) missense probably benign 0.14
R4321:Myo3a UTSW 2 22,271,966 (GRCm39) missense probably damaging 1.00
R4393:Myo3a UTSW 2 22,467,866 (GRCm39) missense probably damaging 0.99
R4398:Myo3a UTSW 2 22,467,854 (GRCm39) missense probably benign
R4446:Myo3a UTSW 2 22,490,149 (GRCm39) missense probably damaging 1.00
R4685:Myo3a UTSW 2 22,412,233 (GRCm39) missense probably damaging 1.00
R5032:Myo3a UTSW 2 22,287,413 (GRCm39) missense probably damaging 1.00
R5096:Myo3a UTSW 2 22,464,254 (GRCm39) missense probably benign 0.16
R5183:Myo3a UTSW 2 22,468,170 (GRCm39) missense probably benign 0.05
R5458:Myo3a UTSW 2 22,250,361 (GRCm39) missense probably damaging 1.00
R5502:Myo3a UTSW 2 22,448,381 (GRCm39) missense probably damaging 1.00
R5522:Myo3a UTSW 2 22,464,353 (GRCm39) missense probably damaging 1.00
R6462:Myo3a UTSW 2 22,448,423 (GRCm39) missense probably damaging 1.00
R6479:Myo3a UTSW 2 22,467,877 (GRCm39) missense probably benign 0.00
R6513:Myo3a UTSW 2 22,412,143 (GRCm39) missense probably damaging 1.00
R6520:Myo3a UTSW 2 22,404,737 (GRCm39) missense possibly damaging 0.90
R6602:Myo3a UTSW 2 22,467,799 (GRCm39) missense probably damaging 0.96
R6671:Myo3a UTSW 2 22,299,333 (GRCm39) missense probably damaging 1.00
R6743:Myo3a UTSW 2 22,366,475 (GRCm39) missense probably benign 0.24
R6865:Myo3a UTSW 2 22,464,313 (GRCm39) missense probably benign 0.00
R6961:Myo3a UTSW 2 22,250,369 (GRCm39) missense probably benign 0.00
R7001:Myo3a UTSW 2 22,337,188 (GRCm39) missense probably benign 0.04
R7215:Myo3a UTSW 2 22,250,378 (GRCm39) missense possibly damaging 0.78
R7301:Myo3a UTSW 2 22,436,504 (GRCm39) critical splice donor site probably null
R7318:Myo3a UTSW 2 22,448,332 (GRCm39) nonsense probably null
R7447:Myo3a UTSW 2 22,436,464 (GRCm39) missense probably benign 0.27
R7456:Myo3a UTSW 2 22,412,255 (GRCm39) missense probably benign 0.08
R7528:Myo3a UTSW 2 22,270,925 (GRCm39) nonsense probably null
R7731:Myo3a UTSW 2 22,287,400 (GRCm39) missense probably damaging 1.00
R7768:Myo3a UTSW 2 22,245,954 (GRCm39) missense probably damaging 0.99
R8054:Myo3a UTSW 2 22,464,329 (GRCm39) missense probably benign 0.00
R8140:Myo3a UTSW 2 22,412,157 (GRCm39) missense probably damaging 1.00
R8143:Myo3a UTSW 2 22,287,476 (GRCm39) critical splice donor site probably null
R8346:Myo3a UTSW 2 22,448,434 (GRCm39) critical splice donor site probably null
R8421:Myo3a UTSW 2 22,366,935 (GRCm39) missense probably benign 0.07
R8495:Myo3a UTSW 2 22,401,084 (GRCm39) missense probably damaging 0.96
R8551:Myo3a UTSW 2 22,337,277 (GRCm39) missense probably benign 0.00
R8708:Myo3a UTSW 2 22,296,607 (GRCm39) splice site probably benign
R8757:Myo3a UTSW 2 22,448,319 (GRCm39) missense possibly damaging 0.49
R8759:Myo3a UTSW 2 22,448,319 (GRCm39) missense possibly damaging 0.49
R8779:Myo3a UTSW 2 22,250,404 (GRCm39) nonsense probably null
R8828:Myo3a UTSW 2 22,245,864 (GRCm39) missense probably benign 0.01
R8910:Myo3a UTSW 2 22,464,280 (GRCm39) missense probably benign 0.01
R8916:Myo3a UTSW 2 22,457,704 (GRCm39) missense probably damaging 1.00
R8926:Myo3a UTSW 2 22,401,074 (GRCm39) missense possibly damaging 0.95
R9028:Myo3a UTSW 2 22,490,099 (GRCm39) missense possibly damaging 0.79
R9046:Myo3a UTSW 2 22,448,367 (GRCm39) missense probably damaging 0.99
R9120:Myo3a UTSW 2 22,436,464 (GRCm39) missense probably benign 0.27
R9153:Myo3a UTSW 2 22,404,744 (GRCm39) missense probably benign 0.02
R9191:Myo3a UTSW 2 22,469,841 (GRCm39) missense probably benign 0.24
R9258:Myo3a UTSW 2 22,467,545 (GRCm39) missense possibly damaging 0.60
R9436:Myo3a UTSW 2 22,412,235 (GRCm39) nonsense probably null
R9464:Myo3a UTSW 2 22,232,383 (GRCm39) start gained probably benign
R9487:Myo3a UTSW 2 22,245,862 (GRCm39) missense probably benign
R9719:Myo3a UTSW 2 22,436,493 (GRCm39) missense probably benign 0.02
R9799:Myo3a UTSW 2 22,490,181 (GRCm39) missense probably damaging 1.00
Z1177:Myo3a UTSW 2 22,508,152 (GRCm39) missense possibly damaging 0.58
Nature of Mutation

DNA sequencing using the SOLiD technique identified an A to G transition at position 3982 of the Myo3a transcript. The mutated nucleotide causes a threonine to alanine substitution at amino acid 345 of the encoded protein. The mutation has been confirmed by DNA sequencing using the Sanger method (Figure 1).

Protein Function and Prediction
The Myo3a gene encodes a 1613 amino acid protein with evidence at the transcript level.  MYO3A is a probably actin-based motor protein with a protein kinase activity.  Its N-terminus belongs to the serine/threonine protein kinase family.  MYO3A contains a myosin head-like domain at amino acids 340-1040, and two calmodulin-binding IQ domains at residues 1054-1110.  It has a nucleotide-binding site at amino acids 27-35. MYO3A is likely to function in vision and hearing (Uniprot Q8K3H5). 
 
The T345A change is predicted to be benign by the PolyPhen program.
Posted On 2009-12-03