rs138693104

Positions:

chr16-70514340-T-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_015386.3(COG4):c.539A>G(p.Lys180Arg) variant causes a missense change. The variant allele was found at a frequency of 0.000664 in 1,614,060 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00034 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00070 ( 1 hom. )

Consequence

COG4
NM_015386.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 4.73

Variant links:

Genes affected

COG4 (HGNC:18620): (component of oligomeric golgi complex 4) The protein encoded by this gene is a component of an oligomeric protein complex involved in the structure and function of the Golgi apparatus. Defects in this gene may be a cause of congenital disorder of glycosylation type IIj. Two transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Aug 2010]

COG4 links:

COG4 (HGNC:):

COG4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.052966952).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000342 (52/152212) while in subpopulation NFE AF= 0.000588 (40/68044). AF 95% confidence interval is 0.000444. There are 0 homozygotes in gnomad4. There are 19 alleles in male gnomad4 subpopulation. Median coverage is 32. 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/exons	MANE	Protein	UniProt
COG4	NM_015386.3 linkuse as main transcript	c.539A>G	p.Lys180Arg	missense_variant	4/19	ENST00000323786.10	NP_056201.2	Q9H9E3J3KNI1Q8N8L9
COG4	NM_001195139.2 linkuse as main transcript	c.527A>G	p.Lys176Arg	missense_variant	4/18		NP_001182068.2	Q9H9E3A0A0A0MS45Q8N8L9
COG4	NM_001365426.1 linkuse as main transcript	c.113A>G	p.Lys38Arg	missense_variant	5/20		NP_001352355.1
COG4	NR_158212.1 linkuse as main transcript	n.550A>G		non_coding_transcript_exon_variant	4/19

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COG4	ENST00000323786.10 linkuse as main transcript	c.539A>G	p.Lys180Arg	missense_variant	4/19	1	NM_015386.3	ENSP00000315775.5		J3KNI1

Frequencies

GnomAD3 genomes

AF:

0.000342

AC:

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.000588

Gnomad OTH

AF:

0.000956

GnomAD3 exomes

AF:

0.000457

AC:

115

AN:

251392

Hom.:

AF XY:

0.000493

AC XY:

AN XY:

135884

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000549

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000654

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000791

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000698

AC:

1020

AN:

1461848

Hom.:

Cov.:

AF XY:

0.000685

AC XY:

498

AN XY:

727222

show subpopulations

Gnomad4 AFR exome

AF:

0.000179

Gnomad4 AMR exome

AF:

0.000425

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000928

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000858

Gnomad4 OTH exome

AF:

0.000513

GnomAD4 genome

AF:

0.000342

AC:

AN:

152212

Hom.:

Cov.:

AF XY:

0.000255

AC XY:

AN XY:

74368

show subpopulations

Gnomad4 AFR

AF:

0.000193

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000588

Gnomad4 OTH

AF:

0.000956

Alfa

AF:

0.000811

Hom.:

Bravo

AF:

0.000434

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000412

AC:

EpiCase

AF:

0.000491

EpiControl

AF:

0.000652

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2022	COG4: BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Dec 05, 2023	In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 16, 2021

The c.539A>G (p.K180R) alteration is located in exon 4 (coding exon 4) of the COG4 gene. This alteration results from a A to G substitution at nucleotide position 539, causing the lysine (K) at amino acid position 180 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

COG4-congenital disorder of glycosylation

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 19, 2024

This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 180 of the COG4 protein (p.Lys180Arg). This variant is present in population databases (rs138693104, gnomAD 0.08%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with COG4-related conditions. ClinVar contains an entry for this variant (Variation ID: 582178). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt COG4 protein function with a negative predictive value of 80%. 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

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.51

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.010

T;T;T

Eigen

Benign

-0.15

Eigen_PC

Benign

0.059

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.92

D;D;D

M_CAP

Benign

0.013

MetaRNN

Benign

0.053

T;T;T

MetaSVM

Benign

-1.0

PrimateAI

Uncertain

0.50

PROVEAN

Benign

-0.73

N;.;.

REVEL

Benign

0.054

Sift

Benign

0.48

T;.;.

Sift4G

Benign

0.52

T;T;.

Vest4

0.13

MVP

0.19

MPC

0.12

ClinPred

0.021

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

gMVP

0.13

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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