Genetic Variant NT5C3B:p.Met170Arg (chr17-41828848-A-C) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_052935.5(NT5C3B):c.509T>G(p.Met170Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,766 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

NT5C3B
NM_052935.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.796

Publications

0 publications found

Variant links:

Genes affected

NT5C3B (HGNC:28300): (5'-nucleotidase, cytosolic IIIB) Predicted to enable 5'-nucleotidase activity. Predicted to be involved in exonucleolytic catabolism of deadenylated mRNA. Predicted to be located in cytosol. Predicted to be active in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

NT5C3B links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09924629).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NT5C3B	NM_052935.5 link	c.509T>G	p.Met170Arg	missense_variant	Exon 7 of 9	ENST00000435506.7	NP_443167.4	Q969T7-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NT5C3B	ENST00000435506.7 link	c.509T>G	p.Met170Arg	missense_variant	Exon 7 of 9	5	NM_052935.5	ENSP00000389948.2		Q969T7-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461766

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727194

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000270

AC:

AN:

1111902

Other (OTH)

AF:

0.0000166

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.538

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

May 19, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.509T>G (p.M170R) alteration is located in exon 7 (coding exon 7) of the NT5C3B gene. This alteration results from a T to G substitution at nucleotide position 509, causing the methionine (M) at amino acid position 170 to be replaced by an arginine (R). 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

0.058

BayesDel_addAF

Benign

-0.0016

BayesDel_noAF

Benign

-0.24

CADD

Benign

(source)

DANN

Benign

0.93

DEOGEN2

Benign

0.21

T;T;.;T

Eigen

Benign

-0.65

Eigen_PC

Benign

-0.52

FATHMM_MKL

Benign

0.47

LIST_S2

Benign

0.61

T;T;T;T

M_CAP

Benign

0.017

MetaRNN

Benign

0.099

T;T;T;T

MetaSVM

Benign

-0.90

MutationAssessor

Benign

1.2

.;L;.;.

PhyloP100

0.80

PrimateAI

Benign

0.34

PROVEAN

Benign

0.33

N;N;N;.

REVEL

Benign

0.21

Sift

Benign

0.35

T;T;T;.

Sift4G

Benign

0.61

T;T;.;T

Vest4

0.33

MVP

0.54

MPC

0.19

ClinPred

0.19

GERP RS

1.8

Varity_R

0.31

gMVP

0.72

Mutation Taster

=76/24

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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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17-41828848-A-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over