rs776218605

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PP3_StrongPP5_Moderate

The NM_000751.3(CHRND):c.769T>C(p.Cys257Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000297 in 1,614,064 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

CHRND
NM_000751.3 missense

Scores

Clinical Significance

Pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 6.12

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 made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a transmembrane_region Helical (size 24) in uniprot entity ACHD_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000751.3

PP3

MetaRNN computational evidence supports a deleterious effect, 0.982

PP5

Variant 2-232530088-T-C is Pathogenic according to our data. Variant chr2-232530088-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 534526.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr2-232530088-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
CHRND	NM_000751.3 linkuse as main transcript	c.769T>C	p.Cys257Arg	missense_variant	7/12	ENST00000258385.8
CHRND	NM_001256657.2 linkuse as main transcript	c.724T>C	p.Cys242Arg	missense_variant	6/11
CHRND	NM_001311196.2 linkuse as main transcript	c.466T>C	p.Cys156Arg	missense_variant	7/12
CHRND	NM_001311195.2 linkuse as main transcript	c.239-1264T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHRND	ENST00000258385.8 linkuse as main transcript	c.769T>C	p.Cys257Arg	missense_variant	7/12	1	NM_000751.3	P1	Q07001-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251396

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135890

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

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:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000315

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.0000289

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000369

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152182

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000264

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Lethal multiple pterygium syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Jan 18, 2024

This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 257 of the CHRND protein (p.Cys257Arg). This variant is present in population databases (rs776218605, gnomAD 0.006%). This missense change has been observed in individual(s) with fetal akinesia deformation sequence (FADS) (PMID: 26578207). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 534526). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CHRND protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects CHRND function (PMID: 26578207). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.34

BayesDel_noAF

Pathogenic

0.43

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Uncertain

0.67

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.92

D;D

M_CAP

Uncertain

0.21

MetaRNN

Pathogenic

0.98

D;D

MetaSVM

Pathogenic

0.81

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.79

PROVEAN

Pathogenic

-11

D;D

REVEL

Pathogenic

0.91

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0010

D;D

Polyphen

1.0

.;D

Vest4

0.93

MutPred

0.89

.;Loss of catalytic residue at P256 (P = 0.0601);

MVP

1.0

MPC

0.90

ClinPred

1.0

GERP RS

5.2

Varity_R

0.97

gMVP

0.95

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

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