Genetic Variant JAM3:p.Met1? (chr11-134069085-T-C) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_ModeratePS1_ModeratePM2

The NM_032801.5(JAM3):c.2T>C(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000372 in 1,610,828 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

JAM3
NM_032801.5 start_lost

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.37

Variant links:

Genes affected

JAM3 (HGNC:15532): (junctional adhesion molecule 3) Tight junctions represent one mode of cell-to-cell adhesion in epithelial or endothelial cell sheets, forming continuous seals around cells and serving as a physical barrier to prevent solutes and water from passing freely through the paracellular space. The protein encoded by this immunoglobulin superfamily gene member is localized in the tight junctions between high endothelial cells. Unlike other proteins in this family, the this protein is unable to adhere to leukocyte cell lines and only forms weak homotypic interactions. The encoded protein is a member of the junctional adhesion molecule protein family and acts as a receptor for another member of this family. A mutation in an intron of this gene is associated with hemorrhagic destruction of the brain, subependymal calcification, and congenital cataracts. Alternative splicing results in multiple transcript variants.[provided by RefSeq, Apr 2011]

JAM3 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 2 pathogenic variants. Next in-frame start position is after 155 codons. Genomic position: 134144845. Lost 0.496 part of the original CDS.

PS1

Another start lost variant in NM_032801.5 (JAM3) was described as [Pathogenic] in Lovd

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
JAM3	NM_032801.5 link	c.2T>C	p.Met1?	start_lost	Exon 1 of 9	ENST00000299106.9	NP_116190.3	Q9BX67-1
JAM3	NM_001205329.2 link	c.2T>C	p.Met1?	start_lost	Exon 1 of 8		NP_001192258.1	Q9BX67-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
JAM3	ENST00000299106.9 link	c.2T>C	p.Met1?	start_lost	Exon 1 of 9	1	NM_032801.5	ENSP00000299106.4		Q9BX67-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000418

AC:

AN:

239108

Hom.:

AF XY:

0.00000762

AC XY:

AN XY:

131198

show subpopulations

Gnomad AFR exome

AF:

0.0000699

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000343

AC:

AN:

1458514

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

725662

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000253

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152314

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.0000240

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.45

BayesDel_noAF

Pathogenic

0.16

CADD

Uncertain

DANN

Benign

0.92

DEOGEN2

Benign

0.11

T;T;.

Eigen

Uncertain

0.41

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Benign

0.71

LIST_S2

Uncertain

0.90

D;D;D

M_CAP

Pathogenic

1.0

MetaRNN

Pathogenic

0.84

D;D;D

MetaSVM

Uncertain

0.12

PROVEAN

Benign

-0.51

N;N;N

REVEL

Uncertain

0.50

Sift

Uncertain

0.024

D;D;D

Sift4G

Uncertain

0.021

D;D;D

Polyphen

0.97

D;.;.

Vest4

0.90

MutPred

0.56

Gain of phosphorylation at M1 (P = 0.0178);Gain of phosphorylation at M1 (P = 0.0178);Gain of phosphorylation at M1 (P = 0.0178);

MVP

0.92

ClinPred

0.98

GERP RS

5.2

Varity_R

0.55

gMVP

0.77

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

LitVar

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

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

LitVar

Other links and lift over