Incidental Mutation 'R4423:Top2a'
ID 327224
Institutional Source Beutler Lab
Gene Symbol Top2a
Ensembl Gene ENSMUSG00000020914
Gene Name topoisomerase (DNA) II alpha
Synonyms DNA Topoisomerase II alpha, Top-2
MMRRC Submission 041143-MU
Accession Numbers
Essential gene? Probably essential (E-score: 0.970) question?
Stock # R4423 (G1)
Quality Score 225
Status Validated
Chromosome 11
Chromosomal Location 98883769-98915015 bp(-) (GRCm39)
Type of Mutation missense
DNA Base Change (assembly) A to G at 98892231 bp (GRCm39)
Zygosity Heterozygous
Amino Acid Change Isoleucine to Threonine at position 1077 (I1077T)
Ref Sequence ENSEMBL: ENSMUSP00000068896 (fasta)
Gene Model predicted gene model for transcript(s): [ENSMUST00000068031]
AlphaFold Q01320
Predicted Effect probably benign
Transcript: ENSMUST00000068031
AA Change: I1077T

PolyPhen 2 Score 0.004 (Sensitivity: 0.98; Specificity: 0.59)
SMART Domains Protein: ENSMUSP00000068896
Gene: ENSMUSG00000020914
AA Change: I1077T

DomainStartEndE-ValueType
low complexity region 10 21 N/A INTRINSIC
Blast:TOP2c 22 60 3e-12 BLAST
HATPase_c 75 224 1.81e-2 SMART
TOP2c 79 669 N/A SMART
TOP4c 692 1166 3.58e-234 SMART
low complexity region 1192 1202 N/A INTRINSIC
low complexity region 1226 1238 N/A INTRINSIC
low complexity region 1261 1273 N/A INTRINSIC
low complexity region 1291 1306 N/A INTRINSIC
low complexity region 1407 1418 N/A INTRINSIC
Pfam:DTHCT 1425 1518 1.1e-18 PFAM
Predicted Effect noncoding transcript
Transcript: ENSMUST00000104097
Predicted Effect noncoding transcript
Transcript: ENSMUST00000144318
Predicted Effect noncoding transcript
Transcript: ENSMUST00000151997
Meta Mutation Damage Score 0.0744 question?
Coding Region Coverage
  • 1x: 99.2%
  • 3x: 98.6%
  • 10x: 97.3%
  • 20x: 95.3%
Validation Efficiency 100% (57/57)
MGI Phenotype FUNCTION: [Summary is not available for the mouse gene. This summary is for the human ortholog.] This gene encodes a DNA topoisomerase, an enzyme that controls and alters the topologic states of DNA during transcription. This nuclear enzyme is involved in processes such as chromosome condensation, chromatid separation, and the relief of torsional stress that occurs during DNA transcription and replication. It catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA. Two forms of this enzyme exist as likely products of a gene duplication event. The gene encoding this form, alpha, is localized to chromosome 17 and the beta gene is localized to chromosome 3. The gene encoding this enzyme functions as the target for several anticancer agents and a variety of mutations in this gene have been associated with the development of drug resistance. Reduced activity of this enzyme may also play a role in ataxia-telangiectasia. [provided by RefSeq, Jul 2010]
Allele List at MGI

All alleles(47) : Targeted(1) Gene trapped(46)

Other mutations in this stock
Total: 54 list
GeneRefVarChr/LocMutationPredicted EffectZygosity
1700017N19Rik C A 10: 100,441,495 (GRCm39) P100Q probably damaging Het
A630010A05Rik A G 16: 14,436,577 (GRCm39) Y210C probably benign Het
Arfgap1 C A 2: 180,622,869 (GRCm39) D327E probably benign Het
Arhgef9 T G X: 94,144,670 (GRCm39) I131L possibly damaging Het
Asgr2 G A 11: 69,996,211 (GRCm39) V218I probably benign Het
Capns2 T A 8: 93,628,252 (GRCm39) I47N possibly damaging Het
Cep44 G A 8: 56,991,652 (GRCm39) P317S probably benign Het
Cfap144 A T 11: 58,687,357 (GRCm39) probably null Het
Cnot10 T A 9: 114,446,988 (GRCm39) I363F probably damaging Het
Coch T A 12: 51,644,932 (GRCm39) probably null Het
Dnah1 C T 14: 31,006,718 (GRCm39) G2199D probably benign Het
Dock9 A G 14: 121,799,465 (GRCm39) probably null Het
Dst T C 1: 34,227,474 (GRCm39) I1689T possibly damaging Het
Eif2ak4 T C 2: 118,269,547 (GRCm39) F762S probably benign Het
Eif2b5 A G 16: 20,320,469 (GRCm39) D195G probably benign Het
Elmo1 C G 13: 20,784,382 (GRCm39) Y646* probably null Het
Far1 T A 7: 113,139,805 (GRCm39) S84R probably damaging Het
Fhod1 T C 8: 106,063,983 (GRCm39) probably benign Het
Galnt15 A T 14: 31,780,226 (GRCm39) I508F possibly damaging Het
Grik1 T C 16: 87,720,088 (GRCm39) T745A probably benign Het
Hira A G 16: 18,774,952 (GRCm39) D959G possibly damaging Het
Hsf5 T C 11: 87,522,460 (GRCm39) L351P probably damaging Het
Icosl C T 10: 77,907,707 (GRCm39) T89I possibly damaging Het
Iws1 T A 18: 32,216,503 (GRCm39) N414K probably damaging Het
Kif1b A G 4: 149,298,562 (GRCm39) S1035P probably damaging Het
Lcp2 G T 11: 34,028,226 (GRCm39) probably benign Het
Map4 C T 9: 109,896,662 (GRCm39) T631I probably damaging Het
Nepn T A 10: 52,267,911 (GRCm39) I59N probably damaging Het
Nin T A 12: 70,089,752 (GRCm39) K1221M probably damaging Het
Nup155 A G 15: 8,150,948 (GRCm39) T333A probably damaging Het
Or10d4c A G 9: 39,558,412 (GRCm39) Y130C probably damaging Het
Or52h9 T C 7: 104,202,552 (GRCm39) V142A probably benign Het
Or8b43 A G 9: 38,360,662 (GRCm39) T165A probably benign Het
Plod2 T C 9: 92,484,042 (GRCm39) L502S probably benign Het
Pnpt1 A G 11: 29,103,375 (GRCm39) probably null Het
Ppat A G 5: 77,063,061 (GRCm39) W517R probably damaging Het
Ppp1r16b C T 2: 158,599,174 (GRCm39) T382I probably benign Het
Prkcq T C 2: 11,260,980 (GRCm39) I344T possibly damaging Het
Rbl1 A G 2: 157,010,875 (GRCm39) probably benign Het
Rpl31-ps17 C T 12: 54,748,397 (GRCm39) noncoding transcript Het
Sec62 T C 3: 30,868,431 (GRCm39) M220T unknown Het
Shprh T G 10: 11,062,262 (GRCm39) V1219G possibly damaging Het
Slc25a46 T C 18: 31,742,651 (GRCm39) T72A probably benign Het
Slc4a2 G A 5: 24,644,846 (GRCm39) W1040* probably null Het
Slc5a1 T C 5: 33,312,018 (GRCm39) V470A possibly damaging Het
Spmap2l T C 5: 77,202,383 (GRCm39) I268T possibly damaging Het
Syvn1 C T 19: 6,099,951 (GRCm39) probably benign Het
Tex47 G T 5: 7,355,364 (GRCm39) A182S probably benign Het
Tpcn1 T C 5: 120,680,583 (GRCm39) K549R probably damaging Het
Trpm2 T C 10: 77,770,902 (GRCm39) D678G probably benign Het
Tut7 T C 13: 59,969,863 (GRCm39) K11E probably damaging Het
Ube3a T C 7: 58,925,861 (GRCm39) I234T probably benign Het
Vmn2r57 T C 7: 41,076,064 (GRCm39) K483E probably damaging Het
Wnk1 T A 6: 119,903,387 (GRCm39) S2111C probably damaging Het
Other mutations in Top2a
AlleleSourceChrCoordTypePredicted EffectPPH Score
IGL00518:Top2a APN 11 98,909,647 (GRCm39) nonsense probably null
IGL01285:Top2a APN 11 98,896,985 (GRCm39) splice site probably benign
IGL01445:Top2a APN 11 98,901,856 (GRCm39) missense probably damaging 1.00
IGL01451:Top2a APN 11 98,901,856 (GRCm39) missense probably damaging 1.00
IGL01456:Top2a APN 11 98,901,856 (GRCm39) missense probably damaging 1.00
IGL01458:Top2a APN 11 98,901,856 (GRCm39) missense probably damaging 1.00
IGL01481:Top2a APN 11 98,901,856 (GRCm39) missense probably damaging 1.00
IGL01485:Top2a APN 11 98,901,856 (GRCm39) missense probably damaging 1.00
IGL01753:Top2a APN 11 98,898,100 (GRCm39) missense probably damaging 0.97
IGL03029:Top2a APN 11 98,909,625 (GRCm39) missense probably benign 0.03
PIT4581001:Top2a UTSW 11 98,893,790 (GRCm39) missense probably damaging 0.97
PIT4585001:Top2a UTSW 11 98,892,199 (GRCm39) missense probably benign 0.02
R0008:Top2a UTSW 11 98,893,729 (GRCm39) nonsense probably null
R0047:Top2a UTSW 11 98,888,682 (GRCm39) missense probably benign
R0047:Top2a UTSW 11 98,888,682 (GRCm39) missense probably benign
R0070:Top2a UTSW 11 98,905,886 (GRCm39) critical splice acceptor site probably null
R0070:Top2a UTSW 11 98,905,886 (GRCm39) critical splice acceptor site probably null
R0116:Top2a UTSW 11 98,894,416 (GRCm39) missense probably benign 0.00
R0245:Top2a UTSW 11 98,900,922 (GRCm39) missense probably benign 0.37
R0276:Top2a UTSW 11 98,900,733 (GRCm39) splice site probably benign
R0288:Top2a UTSW 11 98,907,249 (GRCm39) splice site probably benign
R0335:Top2a UTSW 11 98,913,781 (GRCm39) missense probably benign 0.08
R0422:Top2a UTSW 11 98,900,679 (GRCm39) missense probably damaging 1.00
R0546:Top2a UTSW 11 98,890,052 (GRCm39) missense possibly damaging 0.75
R0558:Top2a UTSW 11 98,887,665 (GRCm39) missense probably benign
R0599:Top2a UTSW 11 98,892,243 (GRCm39) missense probably damaging 0.99
R0727:Top2a UTSW 11 98,902,974 (GRCm39) nonsense probably null
R1565:Top2a UTSW 11 98,891,880 (GRCm39) missense probably damaging 0.99
R1674:Top2a UTSW 11 98,900,099 (GRCm39) missense probably damaging 0.96
R1844:Top2a UTSW 11 98,906,895 (GRCm39) missense probably benign 0.06
R1959:Top2a UTSW 11 98,886,803 (GRCm39) splice site probably null
R2124:Top2a UTSW 11 98,895,054 (GRCm39) missense probably benign 0.00
R2128:Top2a UTSW 11 98,900,633 (GRCm39) missense probably damaging 0.97
R3707:Top2a UTSW 11 98,887,651 (GRCm39) missense probably benign 0.13
R4110:Top2a UTSW 11 98,913,786 (GRCm39) missense probably damaging 1.00
R4112:Top2a UTSW 11 98,913,786 (GRCm39) missense probably damaging 1.00
R4425:Top2a UTSW 11 98,892,231 (GRCm39) missense probably benign 0.00
R4914:Top2a UTSW 11 98,893,786 (GRCm39) missense probably damaging 1.00
R4939:Top2a UTSW 11 98,900,918 (GRCm39) missense probably damaging 1.00
R4944:Top2a UTSW 11 98,888,676 (GRCm39) missense probably benign 0.37
R4971:Top2a UTSW 11 98,884,667 (GRCm39) missense probably damaging 1.00
R5362:Top2a UTSW 11 98,909,738 (GRCm39) missense probably damaging 1.00
R5477:Top2a UTSW 11 98,907,306 (GRCm39) nonsense probably null
R5499:Top2a UTSW 11 98,913,202 (GRCm39) missense probably benign 0.20
R5911:Top2a UTSW 11 98,907,291 (GRCm39) missense possibly damaging 0.92
R7126:Top2a UTSW 11 98,905,818 (GRCm39) missense probably benign 0.09
R7131:Top2a UTSW 11 98,895,008 (GRCm39) missense possibly damaging 0.75
R7174:Top2a UTSW 11 98,914,922 (GRCm39) start gained probably benign
R7329:Top2a UTSW 11 98,895,072 (GRCm39) missense possibly damaging 0.57
R7560:Top2a UTSW 11 98,891,663 (GRCm39) missense probably benign
R7563:Top2a UTSW 11 98,907,005 (GRCm39) missense probably damaging 1.00
R7740:Top2a UTSW 11 98,884,640 (GRCm39) missense probably benign 0.34
R7841:Top2a UTSW 11 98,913,176 (GRCm39) missense probably damaging 1.00
R7894:Top2a UTSW 11 98,900,431 (GRCm39) missense probably damaging 1.00
R8122:Top2a UTSW 11 98,889,993 (GRCm39) missense probably benign
R8260:Top2a UTSW 11 98,891,595 (GRCm39) missense probably null 0.87
R8504:Top2a UTSW 11 98,905,567 (GRCm39) missense probably benign
R8550:Top2a UTSW 11 98,886,744 (GRCm39) missense probably benign
R8558:Top2a UTSW 11 98,912,549 (GRCm39) missense probably damaging 1.00
R8693:Top2a UTSW 11 98,900,868 (GRCm39) missense probably damaging 1.00
R8851:Top2a UTSW 11 98,900,677 (GRCm39) missense probably damaging 1.00
R9143:Top2a UTSW 11 98,900,705 (GRCm39) missense probably benign 0.14
R9240:Top2a UTSW 11 98,901,368 (GRCm39) nonsense probably null
R9294:Top2a UTSW 11 98,891,904 (GRCm39) missense probably benign 0.00
R9301:Top2a UTSW 11 98,897,790 (GRCm39) missense probably damaging 0.99
R9383:Top2a UTSW 11 98,901,884 (GRCm39) nonsense probably null
R9450:Top2a UTSW 11 98,894,434 (GRCm39) missense possibly damaging 0.73
R9515:Top2a UTSW 11 98,902,970 (GRCm39) missense probably damaging 0.99
R9655:Top2a UTSW 11 98,905,334 (GRCm39) missense probably damaging 1.00
R9683:Top2a UTSW 11 98,887,683 (GRCm39) missense probably benign 0.21
R9689:Top2a UTSW 11 98,914,883 (GRCm39) missense probably benign 0.01
U24488:Top2a UTSW 11 98,913,252 (GRCm39) missense probably damaging 1.00
X0025:Top2a UTSW 11 98,886,767 (GRCm39) missense probably benign 0.32
Predicted Primers PCR Primer
(F):5'- GAAGTACAAACATGCAGCTTCC -3'
(R):5'- TCCCTTTTGCAGAGAGGAGG -3'

Sequencing Primer
(F):5'- ACAAACATGCAGCTTCCTTCATTTTC -3'
(R):5'- ACTCACTCTGTAGACCAGGCTG -3'
Posted On 2015-07-07