22-38984190-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_StrongBP6_ModerateBS2

The NM_004900.5(APOBEC3B):​c.133C>T​(p.Arg45Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.002 in 1,592,538 control chromosomes in the GnomAD database, including 215 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.0024 ( 16 hom., cov: 31)
Exomes 𝑓: 0.0020 ( 199 hom. )

Consequence

APOBEC3B
NM_004900.5 missense

Scores

19

Clinical Significance

Likely benign criteria provided, single submitter B:2

Conservation

PhyloP100: -5.58
Variant links:
Genes affected
APOBEC3B (HGNC:17352): (apolipoprotein B mRNA editing enzyme catalytic subunit 3B) This gene is a member of the cytidine deaminase gene family. It is one of seven related genes or pseudogenes found in a cluster, thought to result from gene duplication, on chromosome 22. Members of the cluster encode proteins that are structurally and functionally related to the C to U RNA-editing cytidine deaminase APOBEC1. It is thought that the proteins may be RNA editing enzymes and have roles in growth or cell cycle control. A hybrid gene results from the deletion of approximately 29.5 kb of sequence between this gene, APOBEC3B, and the adjacent gene APOBEC3A. The breakpoints of the deletion are within the two genes, so the deletion allele is predicted to have the promoter and coding region of APOBEC3A, but the 3' UTR of APOBEC3B. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2012]

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -10 ACMG points.

BP4
Computational evidence support a benign effect (MetaRNN=0.006023586).
BP6
Variant 22-38984190-C-T is Benign according to our data. Variant chr22-38984190-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 1049516.Status of the report is criteria_provided_single_submitter, 1 stars.
BS2
High Homozygotes in GnomAd4 at 16 AR gene

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
APOBEC3BNM_004900.5 linkc.133C>T p.Arg45Cys missense_variant 2/8 ENST00000333467.4 NP_004891.5 Q9UH17-1
APOBEC3BNM_001270411.2 linkc.133C>T p.Arg45Cys missense_variant 2/8 NP_001257340.2 Q9UH17-3

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
APOBEC3BENST00000333467.4 linkc.133C>T p.Arg45Cys missense_variant 2/81 NM_004900.5 ENSP00000327459.3 Q9UH17-1
APOBEC3BENST00000407298.7 linkc.133C>T p.Arg45Cys missense_variant 2/81 ENSP00000385068.3 Q9UH17-3
APOBEC3BENST00000335760.9 linkn.133C>T non_coding_transcript_exon_variant 2/71 ENSP00000338897.5 Q9UH17-2
APOBEC3BENST00000402182.7 linkc.133C>T p.Arg45Cys missense_variant 2/72 ENSP00000385060.3 B0QYD3

Frequencies

GnomAD3 genomes
AF:
0.00240
AC:
357
AN:
148570
Hom.:
16
Cov.:
31
show subpopulations
Gnomad AFR
AF:
0.00502
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.000970
Gnomad ASJ
AF:
0.00405
Gnomad EAS
AF:
0.00
Gnomad SAS
AF:
0.00111
Gnomad FIN
AF:
0.00
Gnomad MID
AF:
0.00645
Gnomad NFE
AF:
0.00169
Gnomad OTH
AF:
0.00149
GnomAD3 exomes
AF:
0.00178
AC:
434
AN:
243456
Hom.:
28
AF XY:
0.00181
AC XY:
239
AN XY:
132106
show subpopulations
Gnomad AFR exome
AF:
0.00466
Gnomad AMR exome
AF:
0.00148
Gnomad ASJ exome
AF:
0.00491
Gnomad EAS exome
AF:
0.000251
Gnomad SAS exome
AF:
0.00138
Gnomad FIN exome
AF:
0.0000467
Gnomad NFE exome
AF:
0.00186
Gnomad OTH exome
AF:
0.00133
GnomAD4 exome
AF:
0.00196
AC:
2823
AN:
1443898
Hom.:
199
Cov.:
31
AF XY:
0.00194
AC XY:
1393
AN XY:
718346
show subpopulations
Gnomad4 AFR exome
AF:
0.00390
Gnomad4 AMR exome
AF:
0.00161
Gnomad4 ASJ exome
AF:
0.00488
Gnomad4 EAS exome
AF:
0.000223
Gnomad4 SAS exome
AF:
0.00151
Gnomad4 FIN exome
AF:
0.0000567
Gnomad4 NFE exome
AF:
0.00200
Gnomad4 OTH exome
AF:
0.00222
GnomAD4 genome
AF:
0.00240
AC:
357
AN:
148640
Hom.:
16
Cov.:
31
AF XY:
0.00241
AC XY:
174
AN XY:
72344
show subpopulations
Gnomad4 AFR
AF:
0.00500
Gnomad4 AMR
AF:
0.000970
Gnomad4 ASJ
AF:
0.00405
Gnomad4 EAS
AF:
0.00
Gnomad4 SAS
AF:
0.00111
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.00169
Gnomad4 OTH
AF:
0.00149
Alfa
AF:
0.00237
Hom.:
12
TwinsUK
AF:
0.00189
AC:
7
ALSPAC
AF:
0.00208
AC:
8
ESP6500AA
AF:
0.00432
AC:
19
ESP6500EA
AF:
0.00210
AC:
18
ExAC
AF:
0.00172
AC:
205

ClinVar

Significance: Likely benign
Submissions summary: Benign:2
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

not provided Benign:2
Likely benign, criteria provided, single submitternot providedBreakthrough Genomics, Breakthrough Genomics-- -
Likely benign, no assertion criteria providedclinical testingDepartment of Pathology and Laboratory Medicine, Sinai Health System-The APOBEC3B p.Arg45Cys variant was not identified in the literature nor was it identified in ClinVar or Cosmic. The variant was identified in dbSNP (ID: rs143126732) and in control databases in 524 of 274044 chromosomes (34 homozygous) at a frequency of 0.001912 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: African in 141 of 24676 chromosomes (freq: 0.005714), Ashkenazi Jewish in 50 of 10272 chromosomes (freq: 0.004868), European (non-Finnish) in 232 of 127740 chromosomes (freq: 0.001816), Latino in 47 of 32462 chromosomes (freq: 0.001448), South Asian in 41 of 29784 chromosomes (freq: 0.001377), Other in 8 of 7072 chromosomes (freq: 0.001131), East Asian in 4 of 17200 chromosomes (freq: 0.000233) and European (Finnish) in 1 of 24838 chromosomes (freq: 0.00004). The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. The p.Arg45 residue is not conserved in mammals or other organisms and four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
0.14
BayesDel_addAF
Benign
-0.53
T
BayesDel_noAF
Benign
-0.53
CADD
Benign
0.17
DANN
Benign
0.84
DEOGEN2
Benign
0.014
.;T;T
Eigen
Benign
-1.5
Eigen_PC
Benign
-1.6
FATHMM_MKL
Benign
0.0024
N
LIST_S2
Benign
0.44
T;T;T
M_CAP
Benign
0.023
T
MetaRNN
Benign
0.0060
T;T;T
MetaSVM
Benign
-1.0
T
MutationAssessor
Benign
0.0
N;.;N
PrimateAI
Benign
0.21
T
PROVEAN
Benign
-2.3
N;N;N
REVEL
Benign
0.084
Sift
Benign
0.045
D;T;D
Sift4G
Benign
0.081
T;T;T
Polyphen
0.0080
.;.;B
Vest4
0.18
MVP
0.40
MPC
1.9
ClinPred
0.018
T
GERP RS
-4.9
Varity_R
0.19
gMVP
0.47

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.10
Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs143126732; hg19: chr22-39380195; API