Genetic Variant NPAP1:p.Leu82Leu (chr15-24676111-C-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_018958.3(NPAP1):c.244C>T(p.Leu82Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000383 in 1,564,956 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

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

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

NPAP1
NM_018958.3 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.73

Publications

1 publications found

Variant links:

Genes affected

NPAP1 (HGNC:1190): (nuclear pore associated protein 1) This intronless retrogene is located in the Prader-Willi syndrome region on chromosome 15. This gene exhibits tissue-specific imprinting. Expression in adult testis and brain is biallelic, while expression in fetal brain is monoallelic and only from the paternal chromosome. The encoded protein is associated with the nuclear pore complex. [provided by RefSeq, Mar 2021]

NPAP1 links:

ENSG00000286110 (HGNC:):

ENSG00000286110 links:

PWRN1 (HGNC:33235): (Prader-Willi region non-protein coding RNA 1) This gene is located in the Prader-Willi syndrome (PWS) region of chromosome 15, which is known to undergo imprinting. The transcript is believed to be non-coding. It is bi-allelically expressed in testis and kidney, but mono-allelically expressed from the paternal allele in brain. This gene is poly-adenylated and is known to undergo alternative splicing. Transcript variants may represent part of a complex imprinting center-SNURF-SNRPN transcription unit. The contribution of this gene to the PWS phenotype is unknown, but it has been suggested that it may play a role in establishing paternal imprinting in the PWS region, perhaps by maintaining the paternal allele in an open chromatin configuration. [provided by RefSeq, Sep 2009]

PWRN1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.89).

BP7

Synonymous conserved (PhyloP=-1.73 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018958.3. 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
	NPAP1	NM_018958.3	MANE Select	c.244C>T	p.Leu82Leu	synonymous	Exon 1 of 1	NP_061831.2	Q9NZP6

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
NPAP1	ENST00000329468.5	TSL:6 MANE Select	c.244C>T	p.Leu82Leu	synonymous	Exon 1 of 1	ENSP00000333735.3	Q9NZP6
ENSG00000286110	ENST00000650707.1		n.407+105983C>T		intron	N/A
ENSG00000286110	ENST00000651136.1		n.1530+52006C>T		intron	N/A

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:

0.000131

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000992

AC:

AN:

201708

AF XY:

0.00000915

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000359

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000554

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000283

AC:

AN:

1412626

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

699198

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31616

American (AMR)

AF:

0.0000531

AC:

AN:

37652

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

22428

East Asian (EAS)

AF:

0.00

AC:

AN:

38692

South Asian (SAS)

AF:

0.00

AC:

AN:

78250

European-Finnish (FIN)

AF:

0.0000201

AC:

AN:

49794

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5500

European-Non Finnish (NFE)

AF:

9.17e-7

AC:

AN:

1090462

Other (OTH)

AF:

0.00

AC:

AN:

58232

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152330

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74484

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41586

American (AMR)

AF:

0.000131

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5152

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.89

CADD

Benign

1.5

(source)

DANN

Benign

0.59

PhyloP100

-1.7

PromoterAI

0.017

Neutral

(source)

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

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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over