rs199538903

Positions:

• chr2-232526688-C-T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_Strong BP6

The NM_000751.3(CHRND):​c.198+14C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000479 in 1,610,210 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00037 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00049 (1 hom.)
• Consequence: CHRND NM_000751.3 intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:2
• Conservation: PhyloP100: -1.74

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]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 2-232526688-C-T is Benign according to our data. Variant chr2-232526688-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 256780.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHRND	NM_000751.3	c.198+14C>T		intron_variant		ENST00000258385.8	NP_000742.1
CHRND	NM_001256657.2	c.198+14C>T		intron_variant			NP_001243586.1
CHRND	NM_001311195.2	c.-74+14C>T		intron_variant			NP_001298124.1
CHRND	NM_001311196.2	c.-74+14C>T		intron_variant			NP_001298125.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHRND	ENST00000258385.8	c.198+14C>T		intron_variant		1	NM_000751.3	ENSP00000258385	P1

Frequencies

GnomAD3 genomes AF: 0.000375 AC: 57 AN: 152130 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

Gnomad ASJ AF: 0.00173

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000208

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000618

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000489 AC: 122 AN: 249518 Hom.: 1 AF XY: 0.000546 AC XY: 74 AN XY: 135410

Gnomad AFR exome AF: 0.000190

Gnomad AMR exome AF: 0.000347

Gnomad ASJ exome AF: 0.00229

Gnomad EAS exome AF: 0.000273

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.0000925

Gnomad NFE exome AF: 0.000640

Gnomad OTH exome AF: 0.000493

GnomAD4 exome AF: 0.000490 AC: 715 AN: 1457962 Hom.: 1 Cov.: 33 AF XY: 0.000503 AC XY: 365 AN XY: 725352

Gnomad4 AFR exome AF: 0.000120

Gnomad4 AMR exome AF: 0.000358

Gnomad4 ASJ exome AF: 0.00169

Gnomad4 EAS exome AF: 0.000126

Gnomad4 SAS exome AF: 0.000139

Gnomad4 FIN exome AF: 0.0000956

Gnomad4 NFE exome AF: 0.000534

Gnomad4 OTH exome AF: 0.000565

GnomAD4 genome AF: 0.000374 AC: 57 AN: 152248 Hom.: 0 Cov.: 33 AF XY: 0.000389 AC XY: 29 AN XY: 74460

Gnomad4 AFR AF: 0.0000722

Gnomad4 AMR AF: 0.000196

Gnomad4 ASJ AF: 0.00173

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000208

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000618

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.00111 Hom.: 1

Bravo AF: 0.000563

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Lethal multiple pterygium syndrome Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Congenital myasthenic syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

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	-0.88
CADD	Benign	0.84
DANN	Benign	0.58

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

Other links and lift over

dbSNP: rs199538903; hg19: chr2-233391398;