Genetic Variant TARBP1:p.Ala1425Gly (chr1-234393807-G-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_005646.4(TARBP1):c.4274C>G(p.Ala1425Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,644 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A1425V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TARBP1
NM_005646.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.52

Publications

0 publications found

Variant links:

Genes affected

TARBP1 (HGNC:11568): (TAR (HIV-1) RNA binding protein 1) HIV-1, the causative agent of acquired immunodeficiency syndrome (AIDS), contains an RNA genome that produces a chromosomally integrated DNA during the replicative cycle. Activation of HIV-1 gene expression by the transactivator Tat is dependent on an RNA regulatory element (TAR) located downstream of the transcription initiation site. This element forms a stable stem-loop structure and can be bound by either the protein encoded by this gene or by RNA polymerase II. This protein may act to disengage RNA polymerase II from TAR during transcriptional elongation. Alternatively spliced transcripts of this gene may exist, but their full-length natures have not been determined. [provided by RefSeq, Jul 2008]

TARBP1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.055767268).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TARBP1	NM_005646.4 link	c.4274C>G	p.Ala1425Gly	missense_variant	Exon 27 of 30	ENST00000040877.2	NP_005637.3	Q13395

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TARBP1	ENST00000040877.2 link	c.4274C>G	p.Ala1425Gly	missense_variant	Exon 27 of 30	1	NM_005646.4	ENSP00000040877.1	Q13395
TARBP1	ENST00000462259.5 link	n.859C>G		non_coding_transcript_exon_variant	Exon 5 of 8	1
TARBP1	ENST00000483404.5 link	n.2262C>G		non_coding_transcript_exon_variant	Exon 4 of 7	2
TARBP1	ENST00000496673.5 link	n.239C>G		non_coding_transcript_exon_variant	Exon 3 of 5	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460644

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726500

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33354

American (AMR)

AF:

0.00

AC:

AN:

44648

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26114

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

86200

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53262

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111276

Other (OTH)

AF:

0.00

AC:

AN:

60340

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 12, 2022

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.4274C>G (p.A1425G) alteration is located in exon 27 (coding exon 27) of the TARBP1 gene. This alteration results from a C to G substitution at nucleotide position 4274, causing the alanine (A) at amino acid position 1425 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.082

BayesDel_addAF

Benign

-0.35

BayesDel_noAF

Benign

-0.74

CADD

Benign

(source)

DANN

Benign

0.67

DEOGEN2

Benign

0.0076

Eigen

Benign

-0.94

Eigen_PC

Benign

-0.91

FATHMM_MKL

Benign

0.32

LIST_S2

Benign

0.73

M_CAP

Benign

0.0064

MetaRNN

Benign

0.056

MetaSVM

Benign

-0.92

MutationAssessor

Benign

0.69

PhyloP100

2.5

PrimateAI

Benign

0.28

PROVEAN

Benign

0.15

REVEL

Benign

0.031

Sift

Benign

0.40

Sift4G

Benign

0.19

Polyphen

0.033

Vest4

0.12

MutPred

0.37

Loss of sheet (P = 0.003);

MVP

0.095

MPC

0.044

ClinPred

0.15

GERP RS

2.6

Varity_R

0.028

gMVP

0.37

Mutation Taster

=94/6

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over