Genetic Variant NAPRT:c.1447-6C>T (chr8-143575099-G-A) – 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_145201.6(NAPRT):c.1447-6C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 152,036 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

NAPRT
NM_145201.6 splice_region, intron

Scores

Splicing: ADA: 0.002755

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.650

Publications

17 publications found

Variant links:

Genes affected

NAPRT (HGNC:30450): (nicotinate phosphoribosyltransferase) Nicotinic acid (NA; niacin) is converted by nicotinic acid phosphoribosyltransferase (NAPRT; EC 2.4.2.11) to NA mononucleotide (NaMN), which is then converted to NA adenine dinucleotide (NaAD), and finally to nicotinamide adenine dinucleotide (NAD), which serves as a coenzyme in cellular redox reactions and is an essential component of a variety of processes in cellular metabolism including response to stress (Hara et al., 2007).[supplied by OMIM, Mar 2008]

NAPRT links:

ENSG00000255050 (HGNC:):

ENSG00000255050 links:

Genome browser will be placed here

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 (BayesDel_noAF=-0.68).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_145201.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
NAPRT	NM_145201.6	MANE Select	c.1447-6C>T	splice_region intron	N/A	NP_660202.3
NAPRT	NM_001286829.2		c.1408-6C>T	splice_region intron	N/A	NP_001273758.1	Q6XQN6-3
NAPRT	NM_001363145.1		c.1366-6C>T	splice_region intron	N/A	NP_001350074.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
NAPRT	ENST00000449291.7	TSL:1 MANE Select	c.1447-6C>T	splice_region intron	N/A	ENSP00000401508.2	Q6XQN6-1
NAPRT	ENST00000426292.7	TSL:1	c.1408-6C>T	splice_region intron	N/A	ENSP00000390949.3	Q6XQN6-3
NAPRT	ENST00000340490.7	TSL:1	n.1447-6C>T	splice_region intron	N/A	ENSP00000341136.3	G5E977

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152036

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

GnomAD2 exomes

AF:

0.00

AC:

AN:

144158

AF XY:

0.00

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1375124

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

674990

African (AFR)

AF:

0.00

AC:

AN:

31134

American (AMR)

AF:

0.00

AC:

AN:

34240

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23068

East Asian (EAS)

AF:

0.00

AC:

AN:

35572

South Asian (SAS)

AF:

0.00

AC:

AN:

76408

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47494

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5546

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1064754

Other (OTH)

AF:

0.00

AC:

AN:

56908

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152036

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74242

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41364

American (AMR)

AF:

0.00

AC:

AN:

15282

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

67982

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

3890

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.68

CADD

Benign

9.2

(source)

DANN

Benign

0.88

PhyloP100

0.65

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.0028

dbscSNV1_RF

Benign

0.044

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

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