NM_018946.4:c.1A>G

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_ModeratePM2PP5_Moderate

The NM_018946.4(NANS):c.1A>G(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.0000144 in 1,592,314 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 (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000015 ( 0 hom. )

Consequence

NANS
NM_018946.4 start_lost

Scores

Clinical Significance

Likely pathogenic criteria provided, single submitter P:2

Conservation

PhyloP100: 6.70

Variant links:

Genes affected

NANS (HGNC:19237): (N-acetylneuraminate synthase) This gene encodes an enzyme that functions in the biosynthetic pathways of sialic acids. In vitro, the encoded protein uses N-acetylmannosamine 6-phosphate and mannose 6-phosphate as substrates to generate phosphorylated forms of N-acetylneuraminic acid (Neu5Ac) and 2-keto-3-deoxy-D-glycero-D-galacto-nononic acid (KDN), respectively; however, it exhibits much higher activity toward the Neu5Ac phosphate product. In insect cells, expression of this gene results in Neu5Ac and KDN production. This gene is related to the E. coli sialic acid synthase gene neuB, and it can partially restore sialic acid synthase activity in an E. coli neuB-negative mutant. [provided by RefSeq, Jul 2008]

NANS links:

TRIM14 (HGNC:16283): (tripartite motif containing 14) The protein encoded by this gene is a member of the tripartite motif (TRIM) family. The TRIM motif includes three zinc-binding domains, a RING, a B-box type 1 and a B-box type 2, and a coiled-coil region. The protein localizes to cytoplasmic bodies and its function has not been determined. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2010]

TRIM14 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 2 pathogenic variants. Next in-frame start position is after 39 codons. Genomic position: 98056923. Lost 0.106 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 9-98056809-A-G is Pathogenic according to our data. Variant chr9-98056809-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 810396.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NANS	NM_018946.4 link	c.1A>G	p.Met1?	start_lost	Exon 1 of 6	ENST00000210444.6	NP_061819.2
TRIM14	XM_047424162.1 link	c.*29-20996T>C		intron_variant	Intron 6 of 6		XP_047280118.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
NANS	ENST00000210444.6 link	c.1A>G	p.Met1?	start_lost	Exon 1 of 6	1	NM_018946.4	ENSP00000210444.5	Q9NR45
NANS	ENST00000480925.1 link	n.40A>G		non_coding_transcript_exon_variant	Exon 1 of 2	2
NANS	ENST00000495319.1 link	n.42A>G		non_coding_transcript_exon_variant	Exon 1 of 5	3

Frequencies

GnomAD3 genomes

AF:

0.00000659

AC:

AN:

151634

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000164

AC:

AN:

243952

Hom.:

AF XY:

0.0000300

AC XY:

AN XY:

133258

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000110

Gnomad SAS exome

AF:

0.0000658

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000153

AC:

AN:

1440680

Hom.:

Cov.:

AF XY:

0.0000167

AC XY:

AN XY:

717044

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000520

Gnomad4 SAS exome

AF:

0.0000698

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000910

Gnomad4 OTH exome

AF:

0.0000511

GnomAD4 genome

AF:

0.00000659

AC:

AN:

151634

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74070

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.0000330

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3476

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

May 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Spondyloepimetaphyseal dysplasia, Genevieve type

Pathogenic:1

Apr 25, 2022

Institute of Medical Genetics and Genomics, Sir Ganga Ram Hospital

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The homozygous start-loss variant c.1A>G (p.1M?) has an allele frequency-0.0018% in gnomAD (aggregated) database and 0.0033% in 1000g databases. In-silico bioinformatic software predicts this variant by mutation taster as Disease causing. Phenotype observed were micromelia, bilateral hydrocephalus, cerebellar hypoplasia, hypoplastic nasal bone and hydrops. Spondyloepimetaphyseal dysplasia, Camera-Genevieve type is an autosomal recessive disorder. This is also known as NANS-CDG as sialic acid plays a vital role in multiple cellular functions. We classify this variant as likely pathogenic based on the phenotypes. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.090

BayesDel_noAF

Uncertain

0.12

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0037

Eigen

Uncertain

0.42

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.90

M_CAP

Pathogenic

0.61

MetaRNN

Pathogenic

0.99

MetaSVM

Benign

-0.95

PROVEAN

Benign

-1.3

REVEL

Uncertain

0.42

Sift

Uncertain

0.013

Sift4G

Uncertain

0.021

Polyphen

0.83

Vest4

0.91

MutPred

0.97

Loss of loop (P = 0.0804);

MVP

0.60

ClinPred

0.96

GERP RS

5.5

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.7

Varity_R

0.82

gMVP

0.78

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