chr7-74051841-T-C

Variant names:

• chr7-74051841-T-C
• rs727504419
• NM_000501.4:c.889+2T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_000501.4(ELN):​c.889+2T>C variant causes a splice donor, intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ELN NM_000501.4 splice_donor, intron
• Scores: Splicing: ADA: 0.9353
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.372
• Publications: 1 publications found

Genes affected

ELN (HGNC:3327): (elastin) This gene encodes a protein that is one of the two components of elastic fibers. Elastic fibers comprise part of the extracellular matrix and confer elasticity to organs and tissues including the heart, skin, lungs, ligaments, and blood vessels. The encoded protein is rich in hydrophobic amino acids such as glycine and proline, which form mobile hydrophobic regions bounded by crosslinks between lysine residues. Degradation products of the encoded protein, known as elastin-derived peptides or elastokines, bind the elastin receptor complex and other receptors and stimulate migration and proliferation of monocytes and skin fibroblasts. Elastokines can also contribute to cancer progression. Deletions and mutations in this gene are associated with supravalvular aortic stenosis (SVAS) and autosomal dominant cutis laxa. [provided by RefSeq, Aug 2017]

ELN Gene-Disease associations (from GenCC):

• cutis laxa, autosomal dominant 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Ambry Genetics, Genomics England PanelApp, G2P
• supravalvular aortic stenosis

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)
• autosomal dominant cutis laxa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

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

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.04137931 fraction of the gene. Cryptic splice site detected, with MaxEntScore 5.3, offset of 26, new splice context is: cggGTgtgt. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-74051841-T-C is Pathogenic according to our data. Variant chr7-74051841-T-C is described in ClinVar as Pathogenic. ClinVar VariationId is 177951.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000501.4. 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
	ELN	NM_000501.4	MANE Select	c.889+2T>C		splice_donor intron	N/A	NP_000492.2
	ELN	NM_001278939.2		c.889+2T>C		splice_donor intron	N/A	NP_001265868.1
	ELN	NM_001278915.2		c.889+2T>C		splice_donor intron	N/A	NP_001265844.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ELN	ENST00000252034.12	TSL:1 MANE Select	c.889+2T>C		splice_donor intron	N/A	ENSP00000252034.7
	ELN	ENST00000380562.8	TSL:1	c.889+2T>C		splice_donor intron	N/A	ENSP00000369936.4
	ELN	ENST00000458204.5	TSL:1	c.859+2T>C		splice_donor intron	N/A	ENSP00000403162.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Supravalvar aortic stenosis Pathogenic:1

Jun 16, 2011

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The 889+2T>C variant has not been reported in the literature nor previously iden tified by our laboratory. However, the 889+2T>C variant is predicted to cause ab normal splicing because the nucleotide substitution occurs in the highly conserv ed splice consensus sequence. Splice-site alterations are a reported cause of SV AS in the ELN gene (Human Genome Mutation Database, HGMD). In summary, this vari ant is highly likely to be pathogenic.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Benign	-0.17
CADD	Uncertain	25
DANN	Uncertain	0.99
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Benign	0.24	N
PhyloP100		0.37
GERP RS		4.6
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.94
dbscSNV1_RF	Benign	0.56
SpliceAI score (max)		0.94		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.94		Position offset: -2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs727504419; hg19: chr7-73466171;