rs368085185

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP3PP5_Very_Strong

The NM_015909.4(NBAS):c.409C>T(p.Arg137Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000211 in 1,614,042 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R137P) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000022 ( 0 hom. )

Consequence

NBAS
NM_015909.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 2.30

Variant links:

Genes affected

NBAS (HGNC:15625): (NBAS subunit of NRZ tethering complex) This gene encodes a protein with two leucine zipper domains, a ribosomal protein S14 signature domain and a Sec39 like domain. The protein is thought to be involved in Golgi-to-ER transport. Mutations in this gene are associated with short stature, optic nerve atrophy, and Pelger-Huet anomaly. [provided by RefSeq, Oct 2012]

NBAS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.752

PP5

Variant 2-15539327-G-A is Pathogenic according to our data. Variant chr2-15539327-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 218416.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-15539327-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NBAS	NM_015909.4 linkuse as main transcript	c.409C>T	p.Arg137Trp	missense_variant	7/52	ENST00000281513.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NBAS	ENST00000281513.10 linkuse as main transcript	c.409C>T	p.Arg137Trp	missense_variant	7/52	1	NM_015909.4	P1	A2RRP1-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152180

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:

0.0000159

AC:

AN:

251480

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135918

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000219

AC:

AN:

1461862

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

727238

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

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:

0.0000198

Gnomad4 OTH exome

AF:

0.0000993

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74330

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

Bravo

AF:

0.0000189

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Infantile liver failure syndrome 2

Pathogenic:2

Pathogenic, criteria provided, single submitter	research	CHU Sainte-Justine Research Center, University of Montreal	Oct 18, 2015	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	-	- -

Acute infantile liver failure due to synthesis defect of mtDNA-encoded proteins

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Oct 11, 2023

Variant summary: NBAS c.409C>T (p.Arg137Trp) results in a non-conservative amino acid change located in the Neuroblastoma-amplified sequence, N-terminal domain (IPR029145) of the encoded protein sequence. Two of four in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 1.6e-05 in 251480 control chromosomes (gnomAD). c.409C>T has been reported in the literature in multiple compound heterozygous and homozygous individuals affected with Liver Failure Acute Infantile (Segarra_2015, Staufner_2015, Cardenas_2017, Capo-Chichi_2015). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 26578240, 28410752, 31964843, 28576691, 26286438, 26541327). Two submitters have cited clinical-significance assessments for this variant to ClinVar after 2014 and classified the variant as pathogenic and likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Invitae

Dec 11, 2023

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 137 of the NBAS protein (p.Arg137Trp). This variant is present in population databases (rs368085185, gnomAD 0.004%). This missense change has been observed in individuals with clinical features of NBAS-related conditions (PMID: 26286438, 26578240, 28410752, 34906502). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 218416). 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 not expected to disrupt NBAS protein function with a negative predictive value of 95%. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

0.040

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.47

Eigen

Benign

-0.12

Eigen_PC

Benign

0.016

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.96

M_CAP

Benign

0.028

MetaRNN

Pathogenic

0.75

MetaSVM

Benign

-0.94

MutationAssessor

Benign

1.6

MutationTaster

Benign

1.0

D;N

PrimateAI

Uncertain

0.49

PROVEAN

Pathogenic

-4.8

REVEL

Uncertain

0.29

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.0020

Polyphen

0.17

Vest4

0.89

MVP

0.49

MPC

0.042

ClinPred

0.90

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.51

gMVP

0.72

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