3-15451674-G-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BA1

The NM_005677.4(COLQ):c.1338C>A(p.Ile446Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00415 in 1,614,142 control chromosomes in the GnomAD database, including 198 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. I446I) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.021 ( 89 hom., cov: 33)

Exomes 𝑓: 0.0024 ( 109 hom. )

Consequence

COLQ
NM_005677.4 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 1.58

Publications

1 publications found

Variant links:

Genes affected

COLQ (HGNC:2226): (collagen like tail subunit of asymmetric acetylcholinesterase) This gene encodes the subunit of a collagen-like molecule associated with acetylcholinesterase in skeletal muscle. Each molecule is composed of three identical subunits. Each subunit contains a proline-rich attachment domain (PRAD) that binds an acetylcholinesterase tetramer to anchor the catalytic subunit of the enzyme to the basal lamina. Mutations in this gene are associated with endplate acetylcholinesterase deficiency. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

COLQ Gene-Disease associations (from GenCC):

congenital myasthenic syndrome 5
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, PanelApp Australia

COLQ links:

ENSG00000293553 (HGNC:):

ENSG00000293553 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -19 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.27).

BP6

Variant 3-15451674-G-T is Benign according to our data. Variant chr3-15451674-G-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 259855.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=1.58 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0681 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
COLQ	NM_005677.4 link	c.1338C>A	p.Ile446Ile	synonymous_variant	Exon 17 of 17	ENST00000383788.10	NP_005668.2
COLQ	NM_080538.2 link	c.1308C>A	p.Ile436Ile	synonymous_variant	Exon 17 of 17		NP_536799.1
COLQ	NM_080539.4 link	c.1236C>A	p.Ile412Ile	synonymous_variant	Exon 16 of 16		NP_536800.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
COLQ	ENST00000383788.10 link	c.1338C>A	p.Ile446Ile	synonymous_variant	Exon 17 of 17	1	NM_005677.4	ENSP00000373298.3
COLQ	ENST00000603808.5 link	c.1341C>A	p.Ile447Ile	synonymous_variant	Exon 17 of 17	1		ENSP00000474271.1
ENSG00000293553	ENST00000629729.3 link	n.*62C>A		non_coding_transcript_exon_variant	Exon 3 of 6	5		ENSP00000518887.1
ENSG00000293553	ENST00000629729.3 link	n.*62C>A		3_prime_UTR_variant	Exon 3 of 6	5		ENSP00000518887.1

Frequencies

GnomAD3 genomes

AF:

0.0209

AC:

3180

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0703

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0122

Gnomad ASJ

AF:

0.00490

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000415

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000382

Gnomad OTH

AF:

0.0167

GnomAD2 exomes

AF:

0.00582

AC:

1462

AN:

251324

AF XY:

0.00431

show subpopulations

Gnomad AFR exome

AF:

0.0716

Gnomad AMR exome

AF:

0.00509

Gnomad ASJ exome

AF:

0.00437

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000414

Gnomad OTH exome

AF:

0.00407

GnomAD4 exome

AF:

0.00241

AC:

3521

AN:

1461846

Hom.:

109

Cov.:

AF XY:

0.00217

AC XY:

1576

AN XY:

727220

show subpopulations

African (AFR)

AF:

0.0734

AC:

2456

AN:

33476

American (AMR)

AF:

0.00586

AC:

262

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00509

AC:

133

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.000185

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53408

Middle Eastern (MID)

AF:

0.00555

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.000260

AC:

289

AN:

1111996

Other (OTH)

AF:

0.00550

AC:

332

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.474

Heterozygous variant carriers

186

371

557

742

928

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

156

234

312

390

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0209

AC:

3185

AN:

152296

Hom.:

Cov.:

AF XY:

0.0207

AC XY:

1538

AN XY:

74468

show subpopulations

African (AFR)

AF:

0.0702

AC:

2917

AN:

41548

American (AMR)

AF:

0.0122

AC:

186

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00490

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.000415

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000382

AC:

AN:

68036

Other (OTH)

AF:

0.0166

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

151

302

453

604

755

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

102

136

170

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00680

Hom.:

Bravo

AF:

0.0241

Asia WGS

AF:

0.00375

AC:

AN:

3478

EpiCase

AF:

0.000491

EpiControl

AF:

0.000415

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 06, 2017

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Congenital myasthenic syndrome 5

Benign:2

Jan 26, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided

Benign:2

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Nov 07, 2017

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Benign:1

May 21, 2025

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.27

CADD

Benign

5.0

(source)

DANN

Benign

0.79

PhyloP100

1.6

Mutation Taster

=97/3

polymorphism (auto)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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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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