Genetic Variant MEGF8:p.Gly42Ala (chr19-42326368-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_001271938.2(MEGF8):c.125G>C(p.Gly42Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000348 in 1,436,596 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G42V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Consequence

MEGF8
NM_001271938.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 8.91

Publications

0 publications found

Variant links:

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]

MEGF8 Gene-Disease associations (from GenCC):

MEGF8-related Carpenter syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: PanelApp Australia, G2P, Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae)
Carpenter syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

MEGF8 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.935

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MEGF8	NM_001271938.2 link	c.125G>C	p.Gly42Ala	missense_variant	Exon 1 of 42	ENST00000251268.11	NP_001258867.1	Q7Z7M0-1
MEGF8	NM_001410.3 link	c.125G>C	p.Gly42Ala	missense_variant	Exon 1 of 41		NP_001401.2	Q7Z7M0-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MEGF8	ENST00000251268.11 link	c.125G>C	p.Gly42Ala	missense_variant	Exon 1 of 42	5	NM_001271938.2	ENSP00000251268.5	Q7Z7M0-1
MEGF8	ENST00000334370.8 link	c.125G>C	p.Gly42Ala	missense_variant	Exon 1 of 41	1		ENSP00000334219.4	Q7Z7M0-2
MEGF8	ENST00000378073.5 link	c.-6961G>C		5_prime_UTR_variant	Exon 1 of 41	5		ENSP00000367313.4	F5GZG7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000348

AC:

AN:

1436596

Hom.:

Cov.:

AF XY:

0.00000420

AC XY:

AN XY:

714770

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31466

American (AMR)

AF:

0.00

AC:

AN:

39458

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25390

East Asian (EAS)

AF:

0.000134

AC:

AN:

37322

South Asian (SAS)

AF:

0.00

AC:

AN:

83026

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52688

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5686

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1102260

Other (OTH)

AF:

0.00

AC:

AN:

59300

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.565

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.40

BayesDel_addAF

Uncertain

0.10

BayesDel_noAF

Benign

-0.090

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.66

.;D

Eigen

Pathogenic

0.81

Eigen_PC

Pathogenic

0.81

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.93

D;D

M_CAP

Pathogenic

0.38

MetaRNN

Pathogenic

0.93

D;D

MetaSVM

Uncertain

0.20

MutationAssessor

Pathogenic

3.4

M;M

PhyloP100

8.9

PrimateAI

Uncertain

0.74

PROVEAN

Pathogenic

-4.5

D;D

REVEL

Pathogenic

0.69

Sift

Uncertain

0.023

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

0.87

P;.

Vest4

0.39

MutPred

0.94

Gain of catalytic residue at G42 (P = 0.0643);Gain of catalytic residue at G42 (P = 0.0643);

MVP

0.66

MPC

1.2

ClinPred

0.99

GERP RS

5.6

Varity_R

0.65

gMVP

0.76

Mutation Taster

=36/64

disease causing

(source)

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

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19-42326368-G-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over