chr19-42333663-G-T

Variant names:

• chr19-42333663-G-T
• rs369259465
• NM_001271938.2:c.246G>T

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_Strong BP6_Moderate BP7 BS1

The NM_001271938.2(MEGF8):​c.246G>T​(p.Thr82Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,613,988 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: MEGF8 NM_001271938.2 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -4.24
• 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: PanelApp Australia, G2P, Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae)
• Carpenter syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -11 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP6: Variant 19-42333663-G-T is Benign according to our data. Variant chr19-42333663-G-T is described in ClinVar as [Likely_benign]. Clinvar id is 540558.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-4.24 with no splicing effect.
• BS1: Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.000112 (17/152318) while in subpopulation AMR AF = 0.000588 (9/15302). AF 95% confidence interval is 0.000306. There are 0 homozygotes in GnomAd4. There are 4 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MEGF8	NM_001271938.2	c.246G>T	p.Thr82Thr	synonymous_variant	Exon 2 of 42	ENST00000251268.11	NP_001258867.1
MEGF8	NM_001410.3	c.246G>T	p.Thr82Thr	synonymous_variant	Exon 2 of 41		NP_001401.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MEGF8	ENST00000251268.11	c.246G>T	p.Thr82Thr	synonymous_variant	Exon 2 of 42	5	NM_001271938.2	ENSP00000251268.5
MEGF8	ENST00000334370.8	c.246G>T	p.Thr82Thr	synonymous_variant	Exon 2 of 41	1		ENSP00000334219.4
MEGF8	ENST00000378073.5	c.-6840G>T		5_prime_UTR_variant	Exon 2 of 41	5		ENSP00000367313.4

Frequencies

GnomAD3 genomes AF: 0.0000788 AC: 12 AN: 152200 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000589

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.000958

GnomAD2 exomes AF: 0.0000161 AC: 4 AN: 249206 AF XY: 0.0000148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000556

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000165

GnomAD4 exome AF: 0.0000157 AC: 23 AN: 1461670 Hom.: 0 Cov.: 31 AF XY: 0.0000151 AC XY: 11 AN XY: 727126

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111862

Other (OTH) AF: 0.000315 AC: 19 AN: 60374

GnomAD4 genome AF: 0.000112 AC: 17 AN: 152318 Hom.: 0 Cov.: 32 AF XY: 0.0000537 AC XY: 4 AN XY: 74480

African (AFR) AF: 0.0000241 AC: 1 AN: 41560

American (AMR) AF: 0.000588 AC: 9 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68034

Other (OTH) AF: 0.00332 AC: 7 AN: 2110

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000189

Asia WGS AF: 0.00866 AC: 30 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

MEGF8-related Carpenter syndrome Benign:1

Jan 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	0.11
DANN	Benign	0.80
PhyloP100		-4.2

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

Other links and lift over

dbSNP: rs369259465; hg19: chr19-42837815;