rs16829198

Positions:

• chr2-232540597-T-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_005199.5(CHRNG):​c.241-5T>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000576 in 1,610,780 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0028 (3 hom., cov: 33)
  • Exomes 𝑓: 0.00034 (2 hom.)
• Consequence: CHRNG NM_005199.5 splice_region, intron
• Scores: Splicing: ADA: 0.0001282
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -1.38

Genes affected

CHRNG (HGNC:1967): (cholinergic receptor nicotinic gamma subunit) The mammalian muscle-type acetylcholine receptor is a transmembrane pentameric glycoprotein with two alpha subunits, one beta, one delta, and one epsilon (in adult skeletal muscle) or gamma (in fetal and denervated muscle) subunit. This gene, which encodes the gamma subunit, is expressed prior to the thirty-third week of gestation in humans. The gamma subunit of the acetylcholine receptor plays a role in neuromuscular organogenesis and ligand binding and disruption of gamma subunit expression prevents the correct localization of the receptor in cell membranes. Mutations in this gene cause Escobar syndrome and a lethal form of multiple pterygium syndrome. Muscle-type acetylcholine receptor is the major antigen in the autoimmune disease myasthenia gravis.[provided by RefSeq, Sep 2009]

CHRNG (HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 2-232540597-T-C is Benign according to our data. Variant chr2-232540597-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 259666.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 = 0.0028 (427/152278) while in subpopulation AFR AF= 0.00938 (390/41562). AF 95% confidence interval is 0.00862. There are 3 homozygotes in gnomad4. There are 205 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHRNG	NM_005199.5	c.241-5T>C		splice_region_variant, intron_variant		ENST00000651502.1	NP_005190.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHRNG	ENST00000651502.1	c.241-5T>C		splice_region_variant, intron_variant			NM_005199.5	ENSP00000498757.1
CHRNG	ENST00000389492.3	c.241-5T>C		splice_region_variant, intron_variant		1		ENSP00000374143.3
CHRNG	ENST00000485094.1	n.262-5T>C		splice_region_variant, intron_variant		1

Frequencies

GnomAD3 genomes AF: 0.00279 AC: 425 AN: 152160 Hom.: 3 Cov.: 33

Gnomad AFR AF: 0.00936

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00151

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00526

GnomAD3 exomes AF: 0.000689 AC: 170 AN: 246702 Hom.: 0 AF XY: 0.000553 AC XY: 74 AN XY: 133800

Gnomad AFR exome AF: 0.00879

Gnomad AMR exome AF: 0.000611

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000622

Gnomad OTH exome AF: 0.000331

GnomAD4 exome AF: 0.000344 AC: 501 AN: 1458502 Hom.: 2 Cov.: 32 AF XY: 0.000310 AC XY: 225 AN XY: 725636

Gnomad4 AFR exome AF: 0.0110

Gnomad4 AMR exome AF: 0.000740

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000432

Gnomad4 OTH exome AF: 0.000729

GnomAD4 genome AF: 0.00280 AC: 427 AN: 152278 Hom.: 3 Cov.: 33 AF XY: 0.00275 AC XY: 205 AN XY: 74460

Gnomad4 AFR AF: 0.00938

Gnomad4 AMR AF: 0.00150

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00520

Alfa AF: 0.00106 Hom.: 1

Bravo AF: 0.00341

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.00

EpiControl AF: 0.000179

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	4.9
DANN	Benign	0.67

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00013
dbscSNV1_RF	Benign	0.0080
SpliceAI score (max)		0.040		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: rs16829198; hg19: chr2-233405307;