chr2-232543748-C-A

Variant names:

• chr2-232543748-C-A
• rs73995686
• NM_005199.5:c.1035+49C>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_005199.5(CHRNG):​c.1035+49C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000262 in 1,144,758 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000020 (0 hom.)
• Consequence: CHRNG NM_005199.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.00
• Publications: 4 publications found

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]

TIGD1 (HGNC:14523): (tigger transposable element derived 1) The protein encoded by this gene belongs to the tigger subfamily of the pogo superfamily of DNA-mediated transposons in humans. These proteins are related to DNA transposons found in fungi and nematodes, and more distantly to the Tc1 and mariner transposases. They are also very similar to the major mammalian centromere protein B. The exact function of this gene is not known. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNG	NM_005199.5	c.1035+49C>A		intron_variant	Intron 9 of 11	ENST00000651502.1	NP_005190.4
TIGD1	NM_145702.4	c.*4359G>T		downstream_gene_variant		ENST00000408957.7	NP_663748.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHRNG	ENST00000651502.1	c.1035+49C>A		intron_variant	Intron 9 of 11		NM_005199.5	ENSP00000498757.1
CHRNG	ENST00000389492.3	c.879+49C>A		intron_variant	Intron 8 of 10	1		ENSP00000374143.3
TIGD1	ENST00000408957.7	c.*4359G>T		downstream_gene_variant		6	NM_145702.4	ENSP00000386186.3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152170 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

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: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000430 AC: 1 AN: 232476 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000307

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000201 AC: 2 AN: 992588 Hom.: 0 Cov.: 13 AF XY: 0.00000195 AC XY: 1 AN XY: 512864

African (AFR) AF: 0.00 AC: 0 AN: 24442

American (AMR) AF: 0.0000234 AC: 1 AN: 42702

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23150

East Asian (EAS) AF: 0.00 AC: 0 AN: 37312

South Asian (SAS) AF: 0.00 AC: 0 AN: 76304

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48606

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4874

European-Non Finnish (NFE) AF: 0.00000145 AC: 1 AN: 690280

Other (OTH) AF: 0.00 AC: 0 AN: 44918

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152170 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74316

African (AFR) AF: 0.00 AC: 0 AN: 41444

American (AMR) AF: 0.0000654 AC: 1 AN: 15288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5172

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10614

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68032

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 3

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.43
DANN	Benign	0.60
PhyloP100		-1.0

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: rs73995686; hg19: chr2-233408458;