17-4899481-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBP6

The NM_000080.4(CHRNE):c.1019C>T(p.Pro340Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000166 in 1,597,414 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P340Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

CHRNE
NM_000080.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 0.0790

Publications

1 publications found

Variant links:

Genes affected

CHRNE (HGNC:1966): (cholinergic receptor nicotinic epsilon subunit) Acetylcholine receptors at mature mammalian neuromuscular junctions are pentameric protein complexes composed of four subunits in the ratio of two alpha subunits to one beta, one epsilon, and one delta subunit. The acetylcholine receptor changes subunit composition shortly after birth when the epsilon subunit replaces the gamma subunit seen in embryonic receptors. Mutations in the epsilon subunit are associated with congenital myasthenic syndrome. [provided by RefSeq, Sep 2009]

CHRNE links:

C17orf107 (HGNC:37238): (chromosome 17 open reading frame 107)

C17orf107 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.21278784).

BP6

Variant 17-4899481-G-A is Benign according to our data. Variant chr17-4899481-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 465849.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000080.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHRNE	NM_000080.4	MANE Select	c.1019C>T	p.Pro340Leu	missense	Exon 9 of 12	NP_000071.1
	C17orf107	NM_001145536.2	MANE Select	c.-282G>A		upstream_gene	N/A	NP_001139008.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CHRNE	ENST00000649488.2	MANE Select	c.1019C>T	p.Pro340Leu	missense	Exon 9 of 12	ENSP00000497829.1
C17orf107	ENST00000521575.1	TSL:1	c.-282G>A		5_prime_UTR	Exon 1 of 2	ENSP00000429241.1
CHRNE	ENST00000649830.1		c.86C>T	p.Pro29Leu	missense	Exon 9 of 11	ENSP00000496907.1

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

152134

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

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:

0.000162

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000181

AC:

AN:

221008

AF XY:

0.000159

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000315

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000524

Gnomad NFE exome

AF:

0.000356

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000172

AC:

249

AN:

1445280

Hom.:

Cov.:

AF XY:

0.000170

AC XY:

122

AN XY:

717188

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33322

American (AMR)

AF:

0.000118

AC:

AN:

42406

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25626

East Asian (EAS)

AF:

0.00

AC:

AN:

39108

South Asian (SAS)

AF:

0.0000361

AC:

AN:

83166

European-Finnish (FIN)

AF:

0.0000197

AC:

AN:

50820

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5464

European-Non Finnish (NFE)

AF:

0.000209

AC:

231

AN:

1105636

Other (OTH)

AF:

0.000151

AC:

AN:

59732

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000105

AC:

AN:

152134

Hom.:

Cov.:

AF XY:

0.0000942

AC XY:

AN XY:

74304

show subpopulations

African (AFR)

AF:

0.0000965

AC:

AN:

41440

American (AMR)

AF:

0.0000654

AC:

AN:

15282

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000162

AC:

AN:

68028

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.444

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000901

Hom.:

Bravo

AF:

0.0000907

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000224

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Aug 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 25, 2019

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Inborn genetic diseases

Uncertain:1

Aug 23, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1019C>T (p.P340L) alteration is located in exon 9 (coding exon 9) of the CHRNE gene. This alteration results from a C to T substitution at nucleotide position 1019, causing the proline (P) at amino acid position 340 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Congenital myasthenic syndrome 4A

Benign:1

Oct 12, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.095

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.37

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.33

Eigen

Benign

-0.51

Eigen_PC

Benign

-0.65

FATHMM_MKL

Benign

0.19

LIST_S2

Benign

0.062

M_CAP

Pathogenic

0.64

MetaRNN

Benign

0.21

MetaSVM

Uncertain

-0.22

MutationAssessor

Benign

1.8

PhyloP100

0.079

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-1.4

REVEL

Uncertain

0.37

Sift

Benign

0.33

Sift4G

Benign

0.33

Polyphen

0.99

Vest4

0.19

MVP

0.90

MPC

0.17

ClinPred

0.066

GERP RS

0.43

PromoterAI

0.10

Neutral

(source)

Varity_R

0.070

gMVP

0.40

Mutation Taster

=94/6

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over