rs1555781030

Variant names:

• chr19-42344573-C-T
• rs1555781030
• NM_001271938.2:c.1921C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001271938.2(MEGF8):​c.1921C>T​(p.Leu641Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000139 in 1,441,984 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: MEGF8 NM_001271938.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.931
• Publications: 0 publications found

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: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, ClinGen
• Carpenter syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.23813698).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001271938.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MEGF8	NM_001271938.2	MANE Select	c.1921C>T	p.Leu641Phe	missense	Exon 11 of 42	NP_001258867.1	Q7Z7M0-1
	MEGF8	NM_001410.3		c.1921C>T	p.Leu641Phe	missense	Exon 11 of 41	NP_001401.2	Q7Z7M0-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MEGF8	ENST00000251268.11	TSL:5 MANE Select	c.1921C>T	p.Leu641Phe	missense	Exon 11 of 42	ENSP00000251268.5	Q7Z7M0-1
	MEGF8	ENST00000334370.8	TSL:1	c.1921C>T	p.Leu641Phe	missense	Exon 11 of 41	ENSP00000334219.4	Q7Z7M0-2
	MEGF8	ENST00000378073.5	TSL:5	c.-5165C>T		5_prime_UTR	Exon 11 of 41	ENSP00000367313.4	F5GZG7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000139 AC: 2 AN: 1441984 Hom.: 0 Cov.: 31 AF XY: 0.00000140 AC XY: 1 AN XY: 716356

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

African (AFR) AF: 0.00 AC: 0 AN: 33268

American (AMR) AF: 0.00 AC: 0 AN: 43880

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25698

East Asian (EAS) AF: 0.00 AC: 0 AN: 39434

South Asian (SAS) AF: 0.0000117 AC: 1 AN: 85504

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 43944

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5614

European-Non Finnish (NFE) AF: 9.05e-7 AC: 1 AN: 1104996

Other (OTH) AF: 0.00 AC: 0 AN: 59646

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00000000770867), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	MEGF8-related Carpenter syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Uncertain	24
DANN	Benign	0.88
DEOGEN2	Benign	0.086	T
Eigen	Benign	0.076
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.4	L
PhyloP100		0.93
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.088
Sift	Benign	0.18	T
Sift4G	Uncertain	0.014	D
Polyphen		0.96	D
Vest4		0.48
MutPred		0.44		Gain of sheet (P = 0.0149)
MVP		0.043
MPC		1.1
ClinPred		0.69	D
GERP RS		4.6
Varity_R		0.040
gMVP		0.42
Mutation Taster		=65/35	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1555781030; hg19: chr19-42848725;