rs1555785144

Variant names:

• chr19-42376294-T-G
• rs1555785144
• NM_001271938.2:c.8057T>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001271938.2(MEGF8):​c.8057T>G​(p.Leu2686Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MEGF8 NM_001271938.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.47

Genes affected

MEGF8 (HGNC:3233): (multiple EGF like domains 8) The protein encoded by this gene is a single-pass type I membrane protein of unknown function that contains several EGF-like domains, Kelch repeats, and PSI domains. Defects in this gene are a cause of Carpenter syndrome 2. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24792197).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MEGF8	NM_001271938.2	c.8057T>G	p.Leu2686Trp	missense_variant	Exon 42 of 42	ENST00000251268.11	NP_001258867.1
MEGF8	NM_001410.3	c.7856T>G	p.Leu2619Trp	missense_variant	Exon 41 of 41		NP_001401.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MEGF8	ENST00000251268.11	c.8057T>G	p.Leu2686Trp	missense_variant	Exon 42 of 42	5	NM_001271938.2	ENSP00000251268.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

MEGF8-related Carpenter syndrome Uncertain:1

Jun 17, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a rare missense change with uncertain impact on protein function. It has been reported in both the population and affected individuals, but the available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in an individual with a MEGF8-related disease. This sequence change replaces leucine with tryptophan at codon 2619 of the MEGF8 protein (p.Leu2619Trp). The leucine residue is moderately conserved and there is a small physicochemical difference between leucine and tryptophan. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Benign	-0.016	T
BayesDel_noAF	Benign	-0.26
CADD	Pathogenic	27
DANN	Benign	0.96
DEOGEN2	Uncertain	0.56	.;.;D
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.85	D;T;D
M_CAP	Uncertain	0.095	D
MetaRNN	Benign	0.25	T;T;T
MetaSVM	Benign	-0.70	T
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-3.6	D;D;D
REVEL	Benign	0.20
Sift	Uncertain	0.0030	D;D;D
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.41
MutPred		0.34		.;.;Gain of catalytic residue at M2689 (P = 0.0128);
MVP		0.17
MPC		1.9
ClinPred		0.95	D
GERP RS		4.1
Varity_R		0.32
gMVP		0.63

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: rs1555785144; hg19: chr19-42880446;