rs55824996

Positions:

• chr1-209637948-T-A
• chr1-209637948-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000228.3(LAMB3):​c.332A>T​(p.Asp111Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,098 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: 32)
• Consequence: LAMB3 NM_000228.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.82

Genes affected

LAMB3 (HGNC:6490): (laminin subunit beta 3) The product encoded by this gene is a laminin that belongs to a family of basement membrane proteins. This protein is a beta subunit laminin, which together with an alpha and a gamma subunit, forms laminin-5. Mutations in this gene cause epidermolysis bullosa junctional Herlitz type, and generalized atrophic benign epidermolysis bullosa, diseases that are characterized by blistering of the skin. Multiple alternatively spliced transcript variants that encode the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.841

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LAMB3	NM_000228.3	c.332A>T	p.Asp111Val	missense_variant	5/23	ENST00000356082.9	NP_000219.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LAMB3	ENST00000356082.9	c.332A>T	p.Asp111Val	missense_variant	5/23	1	NM_000228.3	ENSP00000348384	P1
LAMB3	ENST00000367030.7	c.332A>T	p.Asp111Val	missense_variant	5/23	1		ENSP00000355997	P1
LAMB3	ENST00000391911.5	c.332A>T	p.Asp111Val	missense_variant	4/22	1		ENSP00000375778	P1
LAMB3	ENST00000415782.1	c.332A>T	p.Asp111Val	missense_variant	5/6	2		ENSP00000388960

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152098 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

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: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152098 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74298

Gnomad4 AFR AF: 0.00

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: 0.0000147

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.060
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.50	D;D;D;.
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.88	.;D;.;D
M_CAP	Uncertain	0.27	D
MetaRNN	Pathogenic	0.84	D;D;D;D
MetaSVM	Uncertain	0.16	D
MutationAssessor	Uncertain	2.6	M;M;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.31	T
PROVEAN	Pathogenic	-4.7	D;D;D;D
REVEL	Pathogenic	0.66
Sift	Uncertain	0.0010	D;D;D;D
Sift4G	Uncertain	0.0030	D;D;D;D
Polyphen		1.0	D;D;D;.
Vest4		0.63
MutPred		0.69		Loss of disorder (P = 0.0327);Loss of disorder (P = 0.0327);Loss of disorder (P = 0.0327);Loss of disorder (P = 0.0327);
MVP		0.91
MPC		0.62
ClinPred		0.99	D
GERP RS		4.1
Varity_R		0.69
gMVP		0.64

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

Other links and lift over

dbSNP: rs55824996; hg19: chr1-209811293;