NM_031431.4:c.70C>T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_031431.4(COG3):c.70C>T(p.Leu24Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000136 in 1,612,532 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: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

COG3
NM_031431.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.953

Publications

0 publications found

Variant links:

Genes affected

COG3 (HGNC:18619): (component of oligomeric golgi complex 3) This gene encodes a component of the conserved oligomeric Golgi (COG) complex which is composed of eight different subunits and is required for normal Golgi morphology and localization. Defects in the COG complex result in multiple deficiencies in protein glycosylation. The protein encoded by this gene is involved in ER-Golgi transport.[provided by RefSeq, Jun 2011]

COG3 Gene-Disease associations (from GenCC):

congenital disorder of glycosylation, type IIbb
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

COG3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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=0.08756912).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COG3	NM_031431.4 link	c.70C>T	p.Leu24Phe	missense_variant	Exon 1 of 23	ENST00000349995.10	NP_113619.3	Q96JB2-1
COG3	XM_047430702.1 link	c.70C>T	p.Leu24Phe	missense_variant	Exon 1 of 19		XP_047286658.1
COG3	XR_007063702.1 link	n.168C>T		non_coding_transcript_exon_variant	Exon 1 of 14
COG3	XR_429222.5 link	n.168C>T		non_coding_transcript_exon_variant	Exon 1 of 24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COG3	ENST00000349995.10 link	c.70C>T	p.Leu24Phe	missense_variant	Exon 1 of 23	1	NM_031431.4	ENSP00000258654.8		Q96JB2-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152230

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000822

AC:

AN:

243170

AF XY:

0.00000753

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000926

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1460302

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

726470

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33462

American (AMR)

AF:

0.0000224

AC:

AN:

44620

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26102

East Asian (EAS)

AF:

0.00

AC:

AN:

39668

South Asian (SAS)

AF:

0.00

AC:

AN:

86188

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52746

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5580

European-Non Finnish (NFE)

AF:

0.0000171

AC:

AN:

1111666

Other (OTH)

AF:

0.00

AC:

AN:

60270

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74368

show subpopulations

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

African (AFR)

AF:

0.0000241

AC:

AN:

41466

American (AMR)

AF:

0.00

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68036

Other (OTH)

AF:

0.00

AC:

AN:

2094

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 03, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.70C>T (p.L24F) alteration is located in exon 1 (coding exon 1) of the COG3 gene. This alteration results from a C to T substitution at nucleotide position 70, causing the leucine (L) at amino acid position 24 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.074

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.53

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.020

T;.

Eigen

Benign

-0.44

Eigen_PC

Benign

-0.32

FATHMM_MKL

Benign

0.13

LIST_S2

Benign

0.78

T;T

M_CAP

Benign

0.044

MetaRNN

Benign

0.088

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.95

L;L

PhyloP100

0.95

PrimateAI

Uncertain

0.74

PROVEAN

Benign

-1.1

N;.

REVEL

Benign

0.026

Sift

Benign

0.14

T;.

Sift4G

Benign

0.18

T;T

Polyphen

0.0050

B;B

Vest4

0.15

MutPred

0.23

Gain of methylation at K21 (P = 0.0859);Gain of methylation at K21 (P = 0.0859);

MVP

0.14

MPC

0.29

ClinPred

0.38

GERP RS

3.1

PromoterAI

-0.0026

Neutral

(source)

Varity_R

0.095

gMVP

0.32

Mutation Taster

=94/6

polymorphism

(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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NM_031431.4:c.70C>T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over