2-232528303-T-A

Variant names:

• chr2-232528303-T-A
• NM_000751.3:c.285T>A
• CHRND p.Phe95Leu

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_001311196.2(CHRND):​c.14T>A​(p.Leu5*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHRND NM_001311196.2 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0700
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• congenital myasthenic syndrome 3A

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• congenital myasthenic syndrome 3B

  Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
• congenital myasthenic syndrome 3C

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• lethal multiple pterygium syndrome

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• postsynaptic congenital myasthenic syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 26 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001311196.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHRND	NM_000751.3	MANE Select	c.285T>A	p.Phe95Leu	missense	Exon 4 of 12	NP_000742.1	Q07001-1
	CHRND	NM_001311196.2		c.14T>A	p.Leu5*	stop_gained	Exon 4 of 12	NP_001298125.1
	CHRND	NM_001311195.2		c.14T>A	p.Leu5*	stop_gained	Exon 4 of 10	NP_001298124.1	B4E3W4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHRND	ENST00000258385.8	TSL:1 MANE Select	c.285T>A	p.Phe95Leu	missense	Exon 4 of 12	ENSP00000258385.3	Q07001-1
	CHRND	ENST00000543200.5	TSL:2	c.240T>A	p.Phe80Leu	missense	Exon 3 of 11	ENSP00000438380.1	Q07001-2
	CHRND	ENST00000955151.1		c.285T>A	p.Phe95Leu	missense	Exon 4 of 11	ENSP00000625210.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.67	D
Eigen	Benign	0.055
Eigen_PC	Benign	-0.00037
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.87	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Benign	-0.36	T
MutationAssessor	Pathogenic	3.2	M
PhyloP100		-0.070
PrimateAI	Uncertain	0.58	T
PROVEAN	Pathogenic	-4.6	D
REVEL	Pathogenic	0.77
Sift	Uncertain	0.0060	D
Sift4G	Uncertain	0.014	D
Varity_R		0.79
gMVP		0.74
Mutation Taster		=91/109	disease causing (fs/PTC)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr2-233393013;