13-101107503-G-A

Position:

chr13-101107503-G-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_052867.4(NALCN):c.2563C>T(p.Arg855Ter) variant causes a stop gained change. The variant allele was found at a frequency of 0.0000254 in 1,613,976 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 (★★). Variant results in nonsense mediated mRNA decay.

Frequency

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

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

NALCN
NM_052867.4 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:5

Conservation

PhyloP100: 4.66

Variant links:

Genes affected

NALCN (HGNC:19082): (sodium leak channel, non-selective) This gene encodes a voltage-independent, nonselective cation channel which belongs to a family of voltage-gated sodium and calcium channels that regulates the resting membrane potential and excitability of neurons. This family is expressed throughout the nervous system and conducts a persistent sodium leak current that contributes to tonic neuronal excitability. The encoded protein forms a channelosome complex that includes G-protein-coupled receptors, UNC-79, UNC-80, NCA localization factor-1, and src family tyrosine kinases. Naturally occurring mutations in this gene are associated with infantile neuroaxonal dystrophy, infantile hypotonia with psychomotor retardation and characteristic facies (IHPRF) syndrome, and congenital contractures of the limbs and face with hypotonia and developmental delay (CLIFAHDD) syndrome. A knockout of the orthologous gene in mice results in paralysis with a severely disrupted respiratory rhythm, and lethality within 24 hours after birth. [provided by RefSeq, Apr 2017]

NALCN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 13-101107503-G-A is Pathogenic according to our data. Variant chr13-101107503-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 489164.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NALCN	NM_052867.4 linkuse as main transcript	c.2563C>T	p.Arg855Ter	stop_gained	22/44	ENST00000251127.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NALCN	ENST00000251127.11 linkuse as main transcript	c.2563C>T	p.Arg855Ter	stop_gained	22/44	1	NM_052867.4	P1	Q8IZF0-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152212

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251272

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135796

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

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:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000267

AC:

AN:

1461764

Hom.:

Cov.:

AF XY:

0.0000316

AC XY:

AN XY:

727178

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.0000374

Gnomad4 NFE exome

AF:

0.0000297

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152212

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000648

Hom.:

Bravo

AF:

0.00000756

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000412

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hypotonia, infantile, with psychomotor retardation and characteristic facies 1

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Undiagnosed Diseases Network, NIH	Sep 19, 2019	- -
Pathogenic, criteria provided, single submitter	case-control	Genetics Laboratory, Department of Biology, Semnan University	Sep 19, 2018	The WES analysis identified a stop gain mutation in the NALCN gene on chromosome13 (NM_052867); chr13:101107503G/A c.2563C>T p.R855X (rs376152742). The mutation was predicted to be pathogenic by MutationTaster and CADD_phred. Our review of the public resources, local population database, and the literature revealed that there is no previous publication describing this mutation in homozygous form. However, a single ClinVar submission confirmed the pathogenic effects of this genetic anomaly but merely provided an overview of the resulting manifestations with no detailed information. Furthermore, it failed to distinguish between IHPRF1 and CLIFAHDD and resulted in confusion by referring to several publications on CLIFAHDD as supporting evidence (SCV000742166.1). Sanger sequencing confirmed the presence of the mutation and its homozygosity in the proband and segregated with the autosomal recessive inheritance pattern of IHPRF1 in all tested individuals. -
Pathogenic, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	-	The stop gained variant has been reported previously in homozygous and compound heterozygous state in patients affected with Infantile hypotonia with psychomotor retardation and characteristic facies (Karimi et al). The c.2563C>T variant is reported with the allele frequency of 0.002123% in gnomAD and is novel (not in any individuals) in 1000 Genomes. This variant has been reported to the ClinVar database as Pathogenic. The nucleotide change c.2563C>T in NALCN is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. Loss of function variants have been previously reported to be disease causing. For these reasons, this variant has been classified as Pathogenic. -

Inborn genetic diseases

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 14, 2020

The alteration results in a premature stop codon: _x000D_ _x000D_ The c.2563C>T (p.R855*) alteration, located in exon 22 (coding exon 21) of the NALCN gene, results from a C to T substitution at nucleotide position 2563. This changes the amino acid from a arginine (R) to a stop codon at amino acid position 855. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. The alteration has been observed in an affected individual: _x000D_ _x000D_ This alteration was reported in a patient with developmental delay, hypotonia, feeding difficulties, plagiocephaly, and disordered respiratory rhythm with central apnea (Campbell, 2018). Based on the available evidence, this alteration is classified as pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Oct 10, 2022

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 29610177, 32943903, 35808948) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.53

BayesDel_noAF

Pathogenic

0.63

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Pathogenic

0.89

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Uncertain

0.96

MutationTaster

Benign

1.0

Vest4

0.93

GERP RS

4.7

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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