rs757733319

Variant names:

• chr10-49648570-G-A
• rs757733319
• NM_020549.5:c.1345G>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_Moderate BP6

The NM_020549.5(CHAT):​c.1345G>A​(p.Val449Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000446 in 1,613,828 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V449V) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000072 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000042 (0 hom.)
• Consequence: CHAT NM_020549.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 8.12

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]

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.09982914).
• BP6: Variant 10-49648570-G-A is Benign according to our data. Variant chr10-49648570-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 574690.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHAT	NM_020549.5	c.1345G>A	p.Val449Ile	missense_variant	Exon 9 of 15	ENST00000337653.7	NP_065574.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHAT	ENST00000337653.7	c.1345G>A	p.Val449Ile	missense_variant	Exon 9 of 15	1	NM_020549.5	ENSP00000337103.2

Frequencies

GnomAD3 genomes AF: 0.0000723 AC: 11 AN: 152182 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00116

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000678 AC: 17 AN: 250850 AF XY: 0.0000516

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000761

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000265

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000417 AC: 61 AN: 1461646 Hom.: 0 Cov.: 32 AF XY: 0.0000399 AC XY: 29 AN XY: 727136

Gnomad4 AFR exome AF: 0.00 AC: 0 AN: 33468

Gnomad4 AMR exome AF: 0.0000224 AC: 1 AN: 44724

Gnomad4 ASJ exome AF: 0.00 AC: 0 AN: 26134

Gnomad4 EAS exome AF: 0.000277 AC: 11 AN: 39698

Gnomad4 SAS exome AF: 0.0000696 AC: 6 AN: 86232

Gnomad4 FIN exome AF: 0.00 AC: 0 AN: 53382

Gnomad4 NFE exome AF: 0.0000378 AC: 42 AN: 1111858

Gnomad4 Remaining exome AF: 0.0000166 AC: 1 AN: 60388

GnomAD4 genome AF: 0.0000723 AC: 11 AN: 152182 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74348

Gnomad4 AFR AF: 0.00 AC: 0 AN: 0

Gnomad4 AMR AF: 0.0000654 AC: 0.0000654365 AN: 0.0000654365

Gnomad4 ASJ AF: 0.000288 AC: 0.000288018 AN: 0.000288018

Gnomad4 EAS AF: 0.00116 AC: 0.00115562 AN: 0.00115562

Gnomad4 SAS AF: 0.00 AC: 0 AN: 0

Gnomad4 FIN AF: 0.00 AC: 0 AN: 0

Gnomad4 NFE AF: 0.0000441 AC: 0.0000441008 AN: 0.0000441008

Gnomad4 OTH AF: 0.00 AC: 0 AN: 0

Alfa AF: 0.000102 Hom.: 0

Bravo AF: 0.0000831

ExAC AF: 0.0000659 AC: 8

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Familial infantile myasthenia Uncertain:1 Benign:1

Apr 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 25, 2019

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.33	.;.;.;T;.;.
Eigen	Benign	-0.099
Eigen_PC	Benign	0.045
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.89	.;.;D;D;D;D
M_CAP	Benign	0.024	T
MetaRNN	Benign	0.10	T;T;T;T;T;T
MetaSVM	Benign	-0.66	T
MutationAssessor	Benign	1.6	.;.;.;L;.;.
PrimateAI	Uncertain	0.48	T
PROVEAN	Benign	-1.0	N;N;N;N;N;.
REVEL	Uncertain	0.30
Sift	Benign	0.36	T;T;T;T;T;.
Sift4G	Benign	0.33	T;T;T;T;T;.
Polyphen		0.16	.;.;.;B;.;.
Vest4		0.10
MVP		0.88
MPC		0.27
ClinPred		0.17	T
GERP RS		4.1
Varity_R		0.21
gMVP		0.59
Mutation Taster		=67/33	polymorphism

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

Other links and lift over

dbSNP: rs757733319; hg19: chr10-50856616;