chr10-49622143-C-G

Position:

chr10-49622143-C-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_020549.5(CHAT):c.745C>G(p.Leu249Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000628 in 1,553,504 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict 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. L249L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0036 ( 2 hom., cov: 32)

Exomes 𝑓: 0.00035 ( 5 hom. )

Consequence

CHAT
NM_020549.5 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 1.08

Variant links:

Genes affected

CHAT (HGNC:1912): (choline O-acetyltransferase) This gene encodes an enzyme which catalyzes the biosynthesis of the neurotransmitter acetylcholine. This gene product is a characteristic feature of cholinergic neurons, and changes in these neurons may explain some of the symptoms of Alzheimer's disease. Polymorphisms in this gene have been associated with Alzheimer's disease and mild cognitive impairment. Mutations in this gene are associated with congenital myasthenic syndrome associated with episodic apnea. Multiple transcript variants encoding different isoforms have been found for this gene, and some of these variants have been shown to encode more than one isoform. [provided by RefSeq, May 2010]

CHAT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.01505819).

BP6

Variant 10-49622143-C-G is Benign according to our data. Variant chr10-49622143-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 210707.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00357 (478/133716) while in subpopulation AFR AF= 0.0129 (463/35972). AF 95% confidence interval is 0.0119. There are 2 homozygotes in gnomad4. There are 222 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHAT	NM_020549.5 linkuse as main transcript	c.745C>G	p.Leu249Val	missense_variant	5/15	ENST00000337653.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHAT	ENST00000337653.7 linkuse as main transcript	c.745C>G	p.Leu249Val	missense_variant	5/15	1	NM_020549.5	P2	P28329-1

Frequencies

GnomAD3 genomes

AF:

0.00357

AC:

477

AN:

133586

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0129

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000936

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000244

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000162

Gnomad OTH

AF:

0.000569

GnomAD3 exomes

AF:

0.000788

AC:

198

AN:

251414

Hom.:

AF XY:

0.000603

AC XY:

AN XY:

135888

show subpopulations

Gnomad AFR exome

AF:

0.0102

Gnomad AMR exome

AF:

0.000607

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000615

Gnomad OTH exome

AF:

0.000651

GnomAD4 exome

AF:

0.000351

AC:

498

AN:

1419788

Hom.:

Cov.:

AF XY:

0.000312

AC XY:

220

AN XY:

705994

show subpopulations

Gnomad4 AFR exome

AF:

0.0121

Gnomad4 AMR exome

AF:

0.000807

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000466

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000194

Gnomad4 OTH exome

AF:

0.000748

GnomAD4 genome

AF:

0.00357

AC:

478

AN:

133716

Hom.:

Cov.:

AF XY:

0.00343

AC XY:

222

AN XY:

64724

show subpopulations

Gnomad4 AFR

AF:

0.0129

Gnomad4 AMR

AF:

0.000935

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000244

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000162

Gnomad4 OTH

AF:

0.000562

Alfa

AF:

0.000526

Hom.:

Bravo

AF:

0.00347

ESP6500AA

AF:

0.0116

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000972

AC:

118

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial infantile myasthenia

Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 26, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Aug 24, 2021	- -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jan 14, 2015

- -

CHAT-related disorder

Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Oct 12, 2020

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 29, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.14

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.38

.;.;.;T;.

Eigen

Benign

-0.15

Eigen_PC

Benign

0.024

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.73

.;.;T;T;T

MetaRNN

Benign

0.015

T;T;T;T;T

MetaSVM

Uncertain

-0.15

MutationAssessor

Benign

1.5

.;.;.;L;.

MutationTaster

Benign

0.99

D;D;D;D;D;D

PrimateAI

Benign

0.45

PROVEAN

Benign

-1.2

N;N;N;N;N

REVEL

Uncertain

0.32

Sift

Benign

0.11

T;T;T;T;D

Sift4G

Benign

0.10

T;T;T;T;T

Polyphen

0.046

.;.;.;B;.

Vest4

0.26

MVP

0.88

MPC

0.34

ClinPred

0.010

GERP RS

4.8

Varity_R

0.40

gMVP

0.47

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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