Genetic Variant NPTX1:p.Thr203Ser (chr17-80475555-G-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_002522.4(NPTX1):c.608C>G(p.Thr203Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,460,578 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T203N) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

NPTX1
NM_002522.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.62

Publications

0 publications found

Variant links:

Genes affected

NPTX1 (HGNC:7952): (neuronal pentraxin 1) NPTX1 is a member of the neuronal pentraxin gene family. Neuronal pentraxin 1 is similar to the rat NP1 gene which encodes a binding protein for the snake venom toxin taipoxin. Human NPTX1 mRNA is exclusively localized to the nervous system. [provided by RefSeq, Jul 2008]

NPTX1 Gene-Disease associations (from GenCC):

spinocerebellar ataxia 50
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
autosomal dominant cerebellar ataxia
Inheritance: AD Classification: LIMITED Submitted by: ClinGen

NPTX1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.044713676).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002522.4. 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
	NPTX1	NM_002522.4	MANE Select	c.608C>G	p.Thr203Ser	missense	Exon 2 of 5	NP_002513.2	Q15818

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
NPTX1	ENST00000306773.5	TSL:1 MANE Select	c.608C>G	p.Thr203Ser	missense	Exon 2 of 5	ENSP00000307549.4	Q15818
NPTX1	ENST00000571100.2	TSL:4	c.-107C>G		5_prime_UTR	Exon 1 of 4	ENSP00000511957.1	A0A8Q3WL24
NPTX1	ENST00000575212.1	TSL:4	n.397C>G		non_coding_transcript_exon	Exon 2 of 3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1460578

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726578

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44698

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86208

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52380

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5740

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111884

Other (OTH)

AF:

0.00

AC:

AN:

60370

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.060

BayesDel_addAF

Benign

-0.38

BayesDel_noAF

Benign

-0.79

CADD

Benign

(source)

DANN

Benign

0.82

DEOGEN2

Benign

0.037

Eigen

Benign

-1.0

Eigen_PC

Benign

-0.83

FATHMM_MKL

Benign

0.57

LIST_S2

Benign

0.67

M_CAP

Benign

0.0042

MetaRNN

Benign

0.045

MetaSVM

Benign

-0.92

MutationAssessor

Benign

-1.7

PhyloP100

1.6

PrimateAI

Benign

0.43

PROVEAN

Benign

1.3

REVEL

Benign

0.032

Sift

Benign

1.0

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.12

MutPred

0.28

Gain of phosphorylation at T203 (P = 0.0684)

MVP

0.15

MPC

0.65

ClinPred

0.057

GERP RS

0.40

Varity_R

0.058

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over