rs200864778

Variant names:

• chr6-112133494-A-G
• rs200864778
• NM_001105206.3:c.3558-7T>C

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_001105206.3(LAMA4):​c.3558-7T>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000967 in 1,613,576 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000093 (0 hom.)
• Consequence: LAMA4 NM_001105206.3 splice_region, intron
• Scores: Splicing: ADA: 0.00005427
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:3
• Conservation: PhyloP100: 0.227
• Publications: 0 publications found

Genes affected

LAMA4 (HGNC:6484): (laminin subunit alpha 4) Laminins, a family of extracellular matrix glycoproteins, are the major noncollagenous constituent of basement membranes. They have been implicated in a wide variety of biological processes including cell adhesion, differentiation, migration, signaling, neurite outgrowth and metastasis. Laminins are composed of 3 non identical chains: laminin alpha, beta and gamma (formerly A, B1, and B2, respectively) and they form a cruciform structure consisting of 3 short arms, each formed by a different chain, and a long arm composed of all 3 chains. Each laminin chain is a multidomain protein encoded by a distinct gene. Several isoforms of each chain have been described. Different alpha, beta and gamma chain isomers combine to give rise to different heterotrimeric laminin isoforms which are designated by Arabic numerals in the order of their discovery, i.e. alpha1beta1gamma1 heterotrimer is laminin 1. The biological functions of the different chains and trimer molecules are largely unknown, but some of the chains have been shown to differ with respect to their tissue distribution, presumably reflecting diverse functions in vivo. This gene encodes the alpha chain isoform laminin, alpha 4. The domain structure of alpha 4 is similar to that of alpha 3, both of which resemble truncated versions of alpha 1 and alpha 2, in that approximately 1,200 residues at the N-terminus (domains IV, V and VI) have been lost. Laminin, alpha 4 contains the C-terminal G domain which distinguishes all alpha chains from the beta and gamma chains. The RNA analysis from adult and fetal tissues revealed developmental regulation of expression, however, the exact function of laminin, alpha 4 is not known. Tissue-specific utilization of alternative polyA-signal has been described in literature. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Aug 2011]

LAMA4 Gene-Disease associations (from GenCC):

• dilated cardiomyopathy 1JJ

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Illumina
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

LOC107986633 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.76).
• BP6: Variant 6-112133494-A-G is Benign according to our data. Variant chr6-112133494-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 44378.
• BS2: High AC in GnomAd4 at 20 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001105206.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LAMA4	NM_001105206.3	MANE Select	c.3558-7T>C		splice_region intron	N/A	NP_001098676.2
	LAMA4	NM_001105207.3		c.3537-7T>C		splice_region intron	N/A	NP_001098677.2
	LAMA4	NM_002290.5		c.3537-7T>C		splice_region intron	N/A	NP_002281.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LAMA4	ENST00000230538.12	TSL:1 MANE Select	c.3558-7T>C		splice_region intron	N/A	ENSP00000230538.7
	LAMA4	ENST00000389463.9	TSL:1	c.3537-7T>C		splice_region intron	N/A	ENSP00000374114.4
	LAMA4	ENST00000522006.5	TSL:1	c.3537-7T>C		splice_region intron	N/A	ENSP00000429488.1

Frequencies

GnomAD3 genomes AF: 0.000131 AC: 20 AN: 152166 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

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: 0.000221

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000757 AC: 19 AN: 251036 AF XY: 0.0000516

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000132

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.0000931 AC: 136 AN: 1461292 Hom.: 0 Cov.: 32 AF XY: 0.000107 AC XY: 78 AN XY: 726968

African (AFR) AF: 0.00 AC: 0 AN: 33448

American (AMR) AF: 0.000157 AC: 7 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86246

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53408

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.000110 AC: 122 AN: 1111576

Other (OTH) AF: 0.000116 AC: 7 AN: 60352

GnomAD4 genome AF: 0.000131 AC: 20 AN: 152284 Hom.: 0 Cov.: 32 AF XY: 0.000161 AC XY: 12 AN XY: 74462

African (AFR) AF: 0.00 AC: 0 AN: 41542

American (AMR) AF: 0.000327 AC: 5 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000221 AC: 15 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2116

Alfa AF: 0.0000838 Hom.: 0

Bravo AF: 0.000181

EpiCase AF: 0.000164

EpiControl AF: 0.000178

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	1	Dilated cardiomyopathy 1JJ (1)
-	-	1	LAMA4-related disorder (1)
-	-	1	not provided (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	9.5
DANN	Benign	0.67
PhyloP100		0.23
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000054
dbscSNV1_RF	Benign	0.0020
SpliceAI score (max)		0.010		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: rs200864778; hg19: chr6-112454696;