rs774316240

Variant names:

• chr2-196217017-C-A
• rs774316240
• NM_001348768.2:c.4485G>T

Your query was ambiguous. Multiple possible variants found:

• chr2-196217017-C-A
• chr2-196217017-C-T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_001348768.2(HECW2):​c.4485G>T​(p.Arg1495Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000729 in 1,371,480 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: HECW2 NM_001348768.2 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.495
• Publications: 0 publications found

Genes affected

HECW2 (HGNC:29853): (HECT, C2 and WW domain containing E3 ubiquitin protein ligase 2) This gene encodes a member of a family of E3 ubiquitin ligases which plays an important role in the proliferation, migration and differentiation of neural crest cells as a regulator of glial cell line-derived neurotrophic factor (GDNF)/Ret signaling. This gene also plays an important role in angiogenesis through stabilization of endothelial cell-to-cell junctions as a regulator of angiomotin-like 1 stability. The encoded protein contains an N-terminal calcium/lipid-binding (C2) domain involved in membrane targeting, two-four WW domains responsible for cellular localization and substrate recognition, and a C-terminal homologous with E6-associated protein C-terminus (HECT) catalytic domain. Naturally occurring mutations in this gene are associated with neurodevelopmental delay, hypotonia, and epilepsy. The decreased expression of this gene in the aganglionic colon is associated with Hirschsprung's disease. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2017]

HECW2 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD, AR Classification: DEFINITIVE, LIMITED Submitted by: ClinGen
• neurodevelopmental disorder with hypotonia, seizures, and absent language

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Illumina, G2P

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.887
• PP5: Variant 2-196217017-C-A is Pathogenic according to our data. Variant chr2-196217017-C-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 521150.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HECW2	NM_001348768.2	c.4485G>T	p.Arg1495Ser	missense_variant	Exon 27 of 29	ENST00000644978.2	NP_001335697.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HECW2	ENST00000644978.2	c.4485G>T	p.Arg1495Ser	missense_variant	Exon 27 of 29		NM_001348768.2	ENSP00000495418.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.29e-7 AC: 1 AN: 1371480 Hom.: 0 Cov.: 28 AF XY: 0.00000147 AC XY: 1 AN XY: 680156

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

African (AFR) AF: 0.0000362 AC: 1 AN: 27600

American (AMR) AF: 0.00 AC: 0 AN: 26134

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21102

East Asian (EAS) AF: 0.00 AC: 0 AN: 34916

South Asian (SAS) AF: 0.00 AC: 0 AN: 74302

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51066

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5376

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1074850

Other (OTH) AF: 0.00 AC: 0 AN: 56134

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Pathogenic:1

Jun 07, 2016

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.17
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.27	T;.;T;T
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Pathogenic	0.99	.;D;.;D
M_CAP	Benign	0.035	D
MetaRNN	Pathogenic	0.89	D;D;D;D
MetaSVM	Benign	-0.65	T
MutationAssessor	Uncertain	2.7	M;.;M;M
PhyloP100		0.49
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.8	D;.;.;.
REVEL	Uncertain	0.46
Sift	Pathogenic	0.0	D;.;.;.
Sift4G	Pathogenic	0.0010	D;.;.;.
Polyphen		0.99	D;.;D;D
Vest4		0.87
MutPred		0.81		Loss of MoRF binding (P = 0.0704);.;Loss of MoRF binding (P = 0.0704);Loss of MoRF binding (P = 0.0704);
MVP		0.94
MPC		2.3
ClinPred		0.98	D
GERP RS		3.5
Varity_R		0.87
gMVP		0.92
Mutation Taster		=57/43	disease causing (ClinVar)

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: rs774316240; hg19: chr2-197081741;