17-28357690-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 4P and 5B. PM2PM5BP4_StrongBS1_Supporting

The NM_152464.3(TMEM199):c.20C>T(p.Ala7Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000205 in 1,460,336 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A7G) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000021 ( 0 hom. )

Consequence

TMEM199
NM_152464.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.326

Variant links:

Genes affected

TMEM199 (HGNC:18085): (transmembrane protein 199) The protein encoded by this gene has been observed to localize to the endoplasmic reticulum (ER)-Golgi intermediate compartment (ERGIC) and coat protein complex I (COPI) in some human cells. The encoded protein shares some homology with the yeast protein Vma12. Defects in this gene are a cause of congenital disorder of glycosylation, type IIp. [provided by RefSeq, Mar 2016]

TMEM199 links:

ENSG00000258924 (HGNC:):

ENSG00000258924 links:

POLDIP2 (HGNC:23781): (DNA polymerase delta interacting protein 2) This gene encodes a protein that interacts with the DNA polymerase delta p50 subunit, as well as with proliferating cell nuclear antigen. The encoded protein maybe play a role in the ability of the replication fork to bypass DNA lesions. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2014]

POLDIP2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.

BP4

Computational evidence support a benign effect (MetaRNN=0.020415306).

BS1

Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.0000205 (30/1460336) while in subpopulation AMR AF= 0.00038 (17/44718). AF 95% confidence interval is 0.000242. There are 0 homozygotes in gnomad4_exome. There are 15 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM199	NM_152464.3 link	c.20C>T	p.Ala7Val	missense_variant	Exon 1 of 6	ENST00000292114.8	NP_689677.1	Q8N511
POLDIP2	NM_015584.5 link	c.-242G>A		upstream_gene_variant		ENST00000540200.6	NP_056399.1	Q9Y2S7
POLDIP2	NM_001290145.2 link	c.-242G>A		upstream_gene_variant			NP_001277074.1	Q9Y2S7B4DEM9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM199	ENST00000292114.8 link	c.20C>T	p.Ala7Val	missense_variant	Exon 1 of 6	1	NM_152464.3	ENSP00000292114.3		Q8N511
POLDIP2	ENST00000540200.6 link	c.-242G>A		upstream_gene_variant		1	NM_015584.5	ENSP00000475924.2		Q9Y2S7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000890

AC:

AN:

247246

Hom.:

AF XY:

0.0000819

AC XY:

AN XY:

134298

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000521

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.0000654

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000205

AC:

AN:

1460336

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

726506

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000380

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000756

Gnomad4 SAS exome

AF:

0.000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.0000416

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000906

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

May 08, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 2040797). This variant has not been reported in the literature in individuals affected with TMEM199-related conditions. This variant is present in population databases (rs369488804, gnomAD 0.05%). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 7 of the TMEM199 protein (p.Ala7Val). This variant disrupts the p.Ala7 amino acid residue in TMEM199. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 26833330, 34626841, 35401690). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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

0.12

BayesDel_addAF

Benign

-0.54

BayesDel_noAF

Benign

-0.67

CADD

Benign

9.8

DANN

Benign

0.91

DEOGEN2

Benign

0.0016

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.14

LIST_S2

Benign

0.64

M_CAP

Benign

0.012

MetaRNN

Benign

0.020

MetaSVM

Benign

-0.99

MutationAssessor

Benign

-0.18

PrimateAI

Uncertain

0.60

PROVEAN

Benign

0.36

REVEL

Benign

0.072

Sift

Benign

0.72

Sift4G

Benign

1.0

Polyphen

0.0010

Vest4

0.18

MVP

0.030

MPC

0.22

ClinPred

0.028

GERP RS

1.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.029

gMVP

0.22

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over