Genetic Variant NM_014398.4:c.803C>G (chr3-183152460-G-C) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2PP3_Strong

The NM_014398.4(LAMP3):c.803C>G(p.Thr268Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,460,726 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. T268M) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

LAMP3
NM_014398.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.28

Publications

5 publications found

Variant links:

Genes affected

LAMP3 (HGNC:14582): (lysosomal associated membrane protein 3) Dendritic cells (DCs) are the most potent antigen-presenting cells. Immature DCs efficiently capture antigens and differentiate into interdigitating dendritic cells (IDCs) in lymphoid tissues that induce primary T-cell responses (summary by de Saint-Vis et al., 1998 [PubMed 9768752]).[supplied by OMIM, Dec 2010]

LAMP3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.982

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LAMP3	NM_014398.4 link	c.803C>G	p.Thr268Arg	missense_variant	Exon 3 of 6	ENST00000265598.8	NP_055213.2	Q9UQV4
LAMP3	XM_005247360.6 link	c.803C>G	p.Thr268Arg	missense_variant	Exon 4 of 7		XP_005247417.1
LAMP3	XM_047447967.1 link	c.803C>G	p.Thr268Arg	missense_variant	Exon 3 of 6		XP_047303923.1
LAMP3	XM_011512688.3 link	c.803C>G	p.Thr268Arg	missense_variant	Exon 3 of 6		XP_011510990.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LAMP3	ENST00000265598.8 link	c.803C>G	p.Thr268Arg	missense_variant	Exon 3 of 6	1	NM_014398.4	ENSP00000265598.3		Q9UQV4
LAMP3	ENST00000466939.1 link	c.731C>G	p.Thr244Arg	missense_variant	Exon 3 of 6	2		ENSP00000418912.1		E7ETP9

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000200

AC:

AN:

250260

AF XY:

0.0000148

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000274

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1460726

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726720

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33388

American (AMR)

AF:

0.00

AC:

AN:

44598

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.000101

AC:

AN:

39578

South Asian (SAS)

AF:

0.00

AC:

AN:

86130

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5656

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111518

Other (OTH)

AF:

0.00

AC:

AN:

60334

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.413

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 07, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.803C>G (p.T268R) alteration is located in exon 3 (coding exon 3) of the LAMP3 gene. This alteration results from a C to G substitution at nucleotide position 803, causing the threonine (T) at amino acid position 268 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

Pathogenic

0.82

BayesDel_addAF

Uncertain

0.071

BayesDel_noAF

Pathogenic

0.17

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.46

T;T

Eigen

Uncertain

0.63

Eigen_PC

Uncertain

0.52

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.80

T;T

M_CAP

Benign

0.036

MetaRNN

Pathogenic

0.98

D;D

MetaSVM

Benign

-0.39

MutationAssessor

Pathogenic

3.4

M;.

PhyloP100

5.3

PrimateAI

Uncertain

0.53

PROVEAN

Pathogenic

-4.8

D;D

REVEL

Uncertain

0.37

Sift

Uncertain

0.0010

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.89

MutPred

0.88

Gain of solvent accessibility (P = 0.0171);.;

MVP

0.29

MPC

0.37

ClinPred

0.82

GERP RS

5.5

Varity_R

0.96

gMVP

0.28

Mutation Taster

=53/47

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_014398.4:c.803C>G

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