rs778636468

Variant names:

• chr10-49614447-G-A
• rs778636468
• NM_020549.5:c.258G>A

Your query was ambiguous. Multiple possible variants found:

• chr10-49614447-G-A
• chr10-49614447-G-C
• chr10-49614447-G-T

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_Strong BP6_Very_Strong BP7

The NM_020549.5(CHAT):​c.258G>A​(p.Ser86Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000502 in 1,395,486 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 Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. S86S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000050 (0 hom.)
• Consequence: CHAT NM_020549.5 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.889
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• congenital myasthenic syndrome 6

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• presynaptic congenital myasthenic syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP6: Variant 10-49614447-G-A is Benign according to our data. Variant chr10-49614447-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 261333.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.889 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHAT	NM_020549.5	c.258G>A	p.Ser86Ser	synonymous_variant	Exon 1 of 15	ENST00000337653.7	NP_065574.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHAT	ENST00000337653.7	c.258G>A	p.Ser86Ser	synonymous_variant	Exon 1 of 15	1	NM_020549.5	ENSP00000337103.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000502 AC: 7 AN: 1395486 Hom.: 0 Cov.: 35 AF XY: 0.00000726 AC XY: 5 AN XY: 688318

African (AFR) AF: 0.00 AC: 0 AN: 31590

American (AMR) AF: 0.00 AC: 0 AN: 35758

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25156

East Asian (EAS) AF: 0.00 AC: 0 AN: 35812

South Asian (SAS) AF: 0.0000632 AC: 5 AN: 79176

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47096

Middle Eastern (MID) AF: 0.000491 AC: 2 AN: 4070

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1079016

Other (OTH) AF: 0.00 AC: 0 AN: 57812

GnomAD4 genome Cov.: 33

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

-

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Familial infantile myasthenia Benign:1

Sep 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	1.5
DANN	Benign	0.86
PhyloP100		-0.89
PromoterAI		0.18	Neutral

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

Other links and lift over

dbSNP: rs778636468; hg19: chr10-50822493;