19-42326355-C-T

Position:

• chr19-42326355-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001271938.2(MEGF8):​c.112C>T​(p.Arg38Trp) 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)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: MEGF8 NM_001271938.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.01

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.38588035).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MEGF8	NM_001271938.2	c.112C>T	p.Arg38Trp	missense_variant	1/42	ENST00000251268.11
MEGF8	NM_001410.3	c.112C>T	p.Arg38Trp	missense_variant	1/41

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MEGF8	ENST00000251268.11	c.112C>T	p.Arg38Trp	missense_variant	1/42	5	NM_001271938.2	A2
MEGF8	ENST00000334370.8	c.112C>T	p.Arg38Trp	missense_variant	1/41	1		P2
MEGF8	ENST00000378073.5	c.-6974C>T		5_prime_UTR_variant	1/41	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1433430 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 713472

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

MEGF8-related Carpenter syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 06, 2022

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 38 of the MEGF8 protein (p.Arg38Trp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with MEGF8-related conditions. 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 C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.0036	T
BayesDel_noAF	Benign	-0.24
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.24	.;T
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Benign	0.57	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Uncertain	0.093	D
MetaRNN	Benign	0.39	T;T
MetaSVM	Benign	-0.44	T
MutationAssessor	Uncertain	2.1	M;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-2.9	D;D
REVEL	Uncertain	0.36
Sift	Uncertain	0.017	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.35
MutPred		0.66		Loss of disorder (P = 0.026);Loss of disorder (P = 0.026);
MVP		0.37
MPC		1.2
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.23
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: rs1339893627; hg19: chr19-42830507;