chr3-15489556-G-A

Position:

chr3-15489556-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_005677.4(COLQ):c.188C>T(p.Pro63Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,614,076 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

COLQ
NM_005677.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 2.32

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 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COLQ	NM_005677.4 linkuse as main transcript	c.188C>T	p.Pro63Leu	missense_variant	2/17	ENST00000383788.10	NP_005668.2	Q9Y215-1
COLQ	NM_080538.2 linkuse as main transcript	c.158C>T	p.Pro53Leu	missense_variant	2/17		NP_536799.1	Q9Y215-2
COLQ	NM_080539.4 linkuse as main transcript	c.188C>T	p.Pro63Leu	missense_variant	2/16		NP_536800.2	Q9Y215-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COLQ	ENST00000383788.10 linkuse as main transcript	c.188C>T	p.Pro63Leu	missense_variant	2/17	1	NM_005677.4	ENSP00000373298.3		Q9Y215-1
COLQ	ENST00000603808.5 linkuse as main transcript	c.188C>T	p.Pro63Leu	missense_variant	2/17	1		ENSP00000474271.1		A0A0C4DGS2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152190

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152190

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Congenital myasthenic syndrome 5

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 13, 2018

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C65"). The leucine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a COLQ-related disease. This sequence change replaces proline with leucine at codon 63 of the COLQ protein (p.Pro63Leu). The proline residue is highly conserved and there is a moderate physicochemical difference between proline and leucine. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 06, 2023

The c.188C>T (p.P63L) alteration is located in exon 2 (coding exon 2) of the COLQ gene. This alteration results from a C to T substitution at nucleotide position 188, causing the proline (P) at amino acid position 63 to be replaced by a leucine (L). 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

0.097

BayesDel_addAF

Pathogenic

0.19

BayesDel_noAF

Uncertain

0.030

CADD

Benign

DANN

Benign

0.91

DEOGEN2

Uncertain

0.73

D;.;.;.;.

Eigen

Uncertain

0.52

Eigen_PC

Uncertain

0.46

FATHMM_MKL

Uncertain

0.85

LIST_S2

Uncertain

0.94

D;D;D;T;T

M_CAP

Uncertain

0.29

MetaRNN

Uncertain

0.67

D;D;D;D;D

MetaSVM

Uncertain

0.69

MutationAssessor

Pathogenic

3.0

M;.;.;M;.

PrimateAI

Uncertain

0.59

PROVEAN

Uncertain

-4.2

D;D;.;D;.

REVEL

Uncertain

0.55

Sift

Uncertain

0.0040

D;D;.;.;.

Sift4G

Uncertain

0.0020

D;D;D;D;D

Polyphen

1.0

D;D;.;D;.

Vest4

0.41

MutPred

0.47

Loss of glycosylation at P63 (P = 0.0379);.;Loss of glycosylation at P63 (P = 0.0379);Loss of glycosylation at P63 (P = 0.0379);.;

MVP

0.96

MPC

0.41

ClinPred

0.97

GERP RS

5.3

Varity_R

0.61

gMVP

0.39

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