Genetic Variant NM_016027.3:c.316C>T (chr8-70657853-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_016027.3(LACTB2):c.316C>T(p.Arg106Trp) variant causes a missense change. The variant allele was found at a frequency of 0.0000118 in 1,605,458 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

LACTB2
NM_016027.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.53

Publications

2 publications found

Variant links:

Genes affected

LACTB2 (HGNC:18512): (lactamase beta 2) Enables endoribonuclease activity; single-stranded RNA binding activity; and zinc ion binding activity. Involved in RNA phosphodiester bond hydrolysis, endonucleolytic. Located in mitochondrial matrix. [provided by Alliance of Genome Resources, Apr 2022]

LACTB2 links:

LACTB2-AS1 (HGNC:27841): (LACTB2 antisense RNA 1)

LACTB2-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LACTB2	NM_016027.3 link	c.316C>T	p.Arg106Trp	missense_variant	Exon 3 of 7	ENST00000276590.5	NP_057111.1	Q53H82A0A024R811
LACTB2-AS1	NR_038881.1 link	n.582-2292G>A		intron_variant	Intron 3 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
LACTB2	ENST00000276590.5 link	c.316C>T	p.Arg106Trp	missense_variant	Exon 3 of 7	1	NM_016027.3	ENSP00000276590.4	Q53H82
LACTB2-AS1	ENST00000499227.6 link	n.582-2292G>A		intron_variant	Intron 3 of 3	1
LACTB2	ENST00000522447.5 link	c.316C>T	p.Arg106Trp	missense_variant	Exon 3 of 8	2		ENSP00000428801.1	Q53H82

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152082

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000160

AC:

AN:

250414

AF XY:

0.0000148

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000545

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1453376

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

723590

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33262

American (AMR)

AF:

0.00

AC:

AN:

44612

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26050

East Asian (EAS)

AF:

0.00

AC:

AN:

39582

South Asian (SAS)

AF:

0.0000233

AC:

AN:

86000

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53302

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5746

European-Non Finnish (NFE)

AF:

0.0000118

AC:

AN:

1104714

Other (OTH)

AF:

0.00

AC:

AN:

60108

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.382

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152082

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74280

show subpopulations

African (AFR)

AF:

0.0000483

AC:

AN:

41408

American (AMR)

AF:

0.0000655

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5202

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10580

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68010

Other (OTH)

AF:

0.00

AC:

AN:

2084

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 06, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.316C>T (p.R106W) alteration is located in exon 3 (coding exon 3) of the LACTB2 gene. This alteration results from a C to T substitution at nucleotide position 316, causing the arginine (R) at amino acid position 106 to be replaced by a tryptophan (W). 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

Uncertain

0.35

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

0.12

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.71

D;D

Eigen

Benign

-0.0025

Eigen_PC

Benign

0.097

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.93

.;D

M_CAP

Uncertain

0.12

MetaRNN

Uncertain

0.71

D;D

MetaSVM

Benign

-0.71

MutationAssessor

Pathogenic

3.7

H;H

PhyloP100

4.5

PrimateAI

Uncertain

0.56

PROVEAN

Uncertain

-4.2

D;D

REVEL

Uncertain

0.32

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.059

T;T

Polyphen

0.059

B;B

Vest4

0.74

MutPred

0.49

Loss of disorder (P = 0.0145);Loss of disorder (P = 0.0145);

MVP

0.47

MPC

0.033

ClinPred

0.98

GERP RS

4.9

Varity_R

0.74

gMVP

0.89

Mutation Taster

=56/44

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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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NM_016027.3:c.316C>T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over