1-209615147-G-T

Variant names:

• chr1-209615147-G-T
• rs185362831
• NM_000228.3:c.*124C>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000228.3(LAMB3):​c.*124C>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000937 in 1,067,718 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 9.4e-7 (0 hom.)
• Consequence: LAMB3 NM_000228.3 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.120
• Publications: 0 publications found

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]

LAMB3 Gene-Disease associations (from GenCC):

• junctional epidermolysis bullosa

  Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health
• junctional epidermolysis bullosa Herlitz type

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Laboratory for Molecular Medicine, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• junctional epidermolysis bullosa, non-Herlitz type

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, PanelApp Australia
• amelogenesis imperfecta type 1A

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• amelogenesis imperfecta type 1

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• generalized junctional epidermolysis bullosa non-Herlitz type

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000228.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LAMB3	NM_000228.3	MANE Select	c.*124C>A		3_prime_UTR	Exon 23 of 23	NP_000219.2	A0A0S2Z3R6
	LAMB3	NM_001017402.2		c.*124C>A		3_prime_UTR	Exon 22 of 22	NP_001017402.1	Q13751
	LAMB3	NM_001127641.1		c.*124C>A		3_prime_UTR	Exon 23 of 23	NP_001121113.1	A0A0S2Z3R6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LAMB3	ENST00000356082.9	TSL:1 MANE Select	c.*124C>A		3_prime_UTR	Exon 23 of 23	ENSP00000348384.3	Q13751
	LAMB3	ENST00000367030.7	TSL:1	c.*124C>A		3_prime_UTR	Exon 23 of 23	ENSP00000355997.3	Q13751
	LAMB3	ENST00000391911.5	TSL:1	c.*124C>A		3_prime_UTR	Exon 22 of 22	ENSP00000375778.1	Q13751

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 9.37e-7 AC: 1 AN: 1067718 Hom.: 0 Cov.: 14 AF XY: 0.00 AC XY: 0 AN XY: 542364

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

African (AFR) AF: 0.00 AC: 0 AN: 26182

American (AMR) AF: 0.00 AC: 0 AN: 40500

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21602

East Asian (EAS) AF: 0.00 AC: 0 AN: 37168

South Asian (SAS) AF: 0.00 AC: 0 AN: 71906

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 39378

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4764

European-Non Finnish (NFE) AF: 0.00000128 AC: 1 AN: 778858

Other (OTH) AF: 0.00 AC: 0 AN: 47360

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	4.5
DANN	Benign	0.77
PhyloP100		0.12

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

Other links and lift over

dbSNP: rs185362831; hg19: chr1-209788492;