chr2-232529965-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BS1_SupportingBS2

The NM_000751.3(CHRND):c.646C>T(p.Arg216Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000139 in 1,614,110 control chromosomes in the GnomAD database, including 3 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R216Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000098 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00014 ( 3 hom. )

Consequence

CHRND
NM_000751.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2B:1

Conservation

PhyloP100: 0.810

Variant links:

Genes affected

CHRND (HGNC:1965): (cholinergic receptor nicotinic delta subunit) The acetylcholine receptor of muscle has 5 subunits of 4 different types: 2 alpha and 1 each of beta, gamma and delta subunits. After acetylcholine binding, the receptor undergoes an extensive conformation change that affects all subunits and leads to opening of an ion-conducting channel across the plasma membrane. Defects in this gene are a cause of multiple pterygium syndrome lethal type (MUPSL), congenital myasthenic syndrome slow-channel type (SCCMS), and congenital myasthenic syndrome fast-channel type (FCCMS). Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2015]

CHRND links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000985 (15/152302) while in subpopulation SAS AF = 0.00228 (11/4826). AF 95% confidence interval is 0.00128. There are 0 homozygotes in GnomAd4. There are 13 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position FAILED quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 3 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRND	NM_000751.3 link	c.646C>T	p.Arg216Trp	missense_variant	Exon 7 of 12	ENST00000258385.8	NP_000742.1	Q07001-1
CHRND	NM_001256657.2 link	c.601C>T	p.Arg201Trp	missense_variant	Exon 6 of 11		NP_001243586.1	Q07001-2
CHRND	NM_001311196.2 link	c.343C>T	p.Arg115Trp	missense_variant	Exon 7 of 12		NP_001298125.1	Q07001
CHRND	NM_001311195.2 link	c.238+1309C>T		intron_variant	Intron 5 of 9		NP_001298124.1	Q07001B4E3W4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHRND	ENST00000258385.8 link	c.646C>T	p.Arg216Trp	missense_variant	Exon 7 of 12	1	NM_000751.3	ENSP00000258385.3		Q07001-1

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00228

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000217

AC:

AN:

249248

AF XY:

0.000282

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.0000358

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000143

AC:

209

AN:

1461808

Hom.:

Cov.:

AF XY:

0.000183

AC XY:

133

AN XY:

727206

show subpopulations

Gnomad4 AFR exome

AF:

0.00

AC:

AN:

33480

Gnomad4 AMR exome

AF:

0.00

AC:

AN:

44720

Gnomad4 ASJ exome

AF:

0.00

AC:

AN:

26134

Gnomad4 EAS exome

AF:

0.0000504

AC:

AN:

39700

Gnomad4 SAS exome

AF:

0.00179

AC:

154

AN:

86256

Gnomad4 FIN exome

AF:

0.0000187

AC:

AN:

53368

Gnomad4 NFE exome

AF:

0.0000333

AC:

AN:

1111994

Gnomad4 Remaining exome

AF:

0.000248

AC:

AN:

60388

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Exome Het

Exome Hom

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:

0.0000985

AC:

AN:

152302

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.00

AC:

AN:

Gnomad4 AMR

AF:

0.00

AC:

AN:

Gnomad4 ASJ

AF:

0.00

AC:

AN:

Gnomad4 EAS

AF:

0.000193

AC:

0.000193274

AN:

0.000193274

Gnomad4 SAS

AF:

0.00228

AC:

0.00227932

AN:

0.00227932

Gnomad4 FIN

AF:

0.00

AC:

AN:

Gnomad4 NFE

AF:

0.0000441

AC:

0.0000441086

AN:

0.0000441086

Gnomad4 OTH

AF:

0.00

AC:

AN:

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

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:

0.0000405

Hom.:

Bravo

AF:

0.0000378

ExAC

AF:

0.000264

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Lethal multiple pterygium syndrome

Uncertain:1

Jan 11, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 216 of the CHRND protein (p.Arg216Trp). This variant is present in population databases (rs777271963, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with CHRND-related conditions. ClinVar contains an entry for this variant (Variation ID: 570038). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CHRND protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Apr 17, 2023

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

CHRND-related disorder

Benign:1

May 25, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.46

BayesDel_addAF

Benign

-0.053

BayesDel_noAF

Uncertain

0.13

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.55

.;D

Eigen

Uncertain

0.59

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.94

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Uncertain

0.15

MetaRNN

Uncertain

0.46

T;T

MetaSVM

Uncertain

0.17

MutationAssessor

Uncertain

2.8

.;M

PrimateAI

Benign

0.45

PROVEAN

Pathogenic

-4.8

D;D

REVEL

Pathogenic

0.66

Sift

Uncertain

0.0040

D;D

Sift4G

Uncertain

0.022

D;D

Polyphen

1.0

.;D

Vest4

0.74

MutPred

0.69

.;Loss of disorder (P = 0.0366);

MVP

1.0

MPC

0.89

ClinPred

0.34

GERP RS

4.1

Varity_R

0.52

gMVP

0.79

Mutation Taster

=73/27

polymorphism

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over