rs115126024

Positions:

• chr10-49646524-G-A

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_020549.5(CHAT):​c.1131G>A​(p.Ser377Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00371 in 1,614,172 control chromosomes in the GnomAD database, including 184 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.019 (94 hom., cov: 33)
  • Exomes 𝑓: 0.0021 (90 hom.)
• Consequence: CHAT NM_020549.5 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: -2.55

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 Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.68).
• BP6: Variant 10-49646524-G-A is Benign according to our data. Variant chr10-49646524-G-A is described in ClinVar as [Benign]. Clinvar id is 128716.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-2.55 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0623 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHAT	NM_020549.5	c.1131G>A	p.Ser377Ser	synonymous_variant	8/15	ENST00000337653.7	NP_065574.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHAT	ENST00000337653.7	c.1131G>A	p.Ser377Ser	synonymous_variant	8/15	1	NM_020549.5	ENSP00000337103.2

Frequencies

GnomAD3 genomes AF: 0.0189 AC: 2874 AN: 152208 Hom.: 94 Cov.: 33

Gnomad AFR AF: 0.0645

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00955

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000294

Gnomad OTH AF: 0.0153

GnomAD3 exomes AF: 0.00519 AC: 1305 AN: 251316 Hom.: 43 AF XY: 0.00380 AC XY: 517 AN XY: 135876

Gnomad AFR exome AF: 0.0669

Gnomad AMR exome AF: 0.00402

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000457

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000334

Gnomad OTH exome AF: 0.00440

GnomAD4 exome AF: 0.00213 AC: 3114 AN: 1461848 Hom.: 90 Cov.: 32 AF XY: 0.00186 AC XY: 1351 AN XY: 727228

Gnomad4 AFR exome AF: 0.0672

Gnomad4 AMR exome AF: 0.00449

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000278

Gnomad4 OTH exome AF: 0.00502

GnomAD4 genome AF: 0.0189 AC: 2878 AN: 152324 Hom.: 94 Cov.: 33 AF XY: 0.0182 AC XY: 1354 AN XY: 74490

Gnomad4 AFR AF: 0.0644

Gnomad4 AMR AF: 0.00954

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000414

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000294

Gnomad4 OTH AF: 0.0151

Alfa AF: 0.00966 Hom.: 17

Bravo AF: 0.0220

Asia WGS AF: 0.00144 AC: 5 AN: 3478

EpiCase AF: 0.000382

EpiControl AF: 0.000356

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Aug 15, 2013	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 31, 2016	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. -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Nov 06, 2017	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Familial infantile myasthenia Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.68
CADD	Benign	0.41
DANN	Benign	0.88

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: rs115126024; hg19: chr10-50854570;