10-49648606-G-C

Position:

• chr10-49648606-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020549.5(CHAT):​c.1381G>C​(p.Val461Leu) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V461A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHAT NM_020549.5 missense, splice_region
• Scores: Splicing: ADA: 0.2529
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.30

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

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17910424).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHAT	NM_020549.5	c.1381G>C	p.Val461Leu	missense_variant, splice_region_variant	9/15	ENST00000337653.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHAT	ENST00000337653.7	c.1381G>C	p.Val461Leu	missense_variant, splice_region_variant	9/15	1	NM_020549.5	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.037	T
BayesDel_noAF	Benign	-0.18
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.19	.;.;.;T;.;.
Eigen	Benign	-0.64
Eigen_PC	Benign	-0.44
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Benign	0.29	.;.;T;T;T;T
M_CAP	Benign	0.077	D
MetaRNN	Benign	0.18	T;T;T;T;T;T
MetaSVM	Benign	-0.58	T
MutationAssessor	Benign	-0.32	.;.;.;N;.;.
MutationTaster	Benign	1.0	P;P;P;P;P;P
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-0.050	N;N;N;N;N;.
REVEL	Benign	0.28
Sift	Benign	0.15	T;T;T;T;T;.
Sift4G	Benign	0.19	T;T;T;T;T;.
Polyphen		0.0080	.;.;.;B;.;.
Vest4		0.13
MutPred		0.61		.;.;.;Loss of MoRF binding (P = 0.086);.;.;
MVP		0.75
MPC		0.25
ClinPred		0.75	D
GERP RS		3.9
Varity_R		0.12
gMVP		0.47

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.25
dbscSNV1_RF	Benign	0.51
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: rs4838544; hg19: chr10-50856652;