chr2-196215961-G-T

Variant names:

• chr2-196215961-G-T
• rs1687461391
• NM_001348768.2:c.4511C>A

Variant summary

Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PM2 PP2 PP3_Strong PP5_Very_Strong

The NM_001348768.2(HECW2):​c.4511C>A​(p.Ser1504Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: HECW2 NM_001348768.2 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.60

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]

ACMG classification

Verdict is Pathogenic. Variant got 15 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the HECW2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 31 curated pathogenic missense variants (we use a threshold of 10). The gene has 62 curated benign missense variants. Gene score misZ: 3.3052 (above the threshold of 3.09). Trascript score misZ: 3.6429 (above the threshold of 3.09). GenCC associations: The gene is linked to neurodevelopmental disorder with hypotonia, seizures, and absent language, complex neurodevelopmental disorder.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.969
• PP5: Variant 2-196215961-G-T is Pathogenic according to our data. Variant chr2-196215961-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 848063.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-196215961-G-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HECW2	NM_001348768.2	c.4511C>A	p.Ser1504Tyr	missense_variant	Exon 28 of 29	ENST00000644978.2	NP_001335697.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HECW2	ENST00000644978.2	c.4511C>A	p.Ser1504Tyr	missense_variant	Exon 28 of 29		NM_001348768.2	ENSP00000495418.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 29, 2019

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). This variant has been observed in individual(s) with HECW2-related disease (Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with tyrosine at codon 1504 of the HECW2 protein (p.Ser1504Tyr). The serine residue is highly conserved and there is a large physicochemical difference between serine and tyrosine. -

Neurodevelopmental disorder with hypotonia, seizures, and absent language Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Center for Statistical Genetics, Columbia University

Mar 17, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Benign	0.35	T;.;T;T
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.99
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	.;D;.;D
M_CAP	Uncertain	0.24	D
MetaRNN	Pathogenic	0.97	D;D;D;D
MetaSVM	Uncertain	0.29	D
MutationAssessor	Pathogenic	3.9	H;.;H;H
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-5.8	D;.;.;.
REVEL	Pathogenic	0.81
Sift	Pathogenic	0.0	D;.;.;.
Sift4G	Pathogenic	0.0	D;.;.;.
Polyphen		1.0	D;.;D;D
Vest4		0.88
MutPred		0.86		Loss of disorder (P = 0.0445);.;Loss of disorder (P = 0.0445);Loss of disorder (P = 0.0445);
MVP		0.90
MPC		2.4
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.96
gMVP		0.89

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: rs1687461391; hg19: chr2-197080685;