Genetic Variant NAP1L2:p.Met185Ile (chrX-73213938-C-T) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_021963.4(NAP1L2):c.555G>A(p.Met185Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000902 in 1,209,094 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 40 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000081 ( 0 hom., 2 hem., cov: 22)

Exomes 𝑓: 0.000091 ( 0 hom. 38 hem. )

Consequence

NAP1L2
NM_021963.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.641

Variant links:

Genes affected

NAP1L2 (HGNC:7638): (nucleosome assembly protein 1 like 2) The protein encoded by this intronless gene is a member of the nucleosome assembly protein (NAP) family. The encoded protein represents a class of tissue-specific factors that interact with chromatin to regulate neuronal cell proliferation. [provided by RefSeq, Jan 2011]

NAP1L2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.009182662).

BS2

High Hemizygotes in GnomAd4 at 2 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NAP1L2	NM_021963.4 link	c.555G>A	p.Met185Ile	missense_variant	Exon 1 of 1	ENST00000373517.4	NP_068798.1	Q9ULW6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NAP1L2	ENST00000373517.4 link	c.555G>A	p.Met185Ile	missense_variant	Exon 1 of 1	6	NM_021963.4	ENSP00000362616.3		Q9ULW6-1

Frequencies

GnomAD3 genomes

AF:

0.0000811

AC:

AN:

110964

Hom.:

Cov.:

AF XY:

0.0000604

AC XY:

AN XY:

33128

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:

0.000782

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000113

Gnomad OTH

AF:

0.000668

GnomAD3 exomes

AF:

0.000153

AC:

AN:

183257

Hom.:

AF XY:

0.000221

AC XY:

AN XY:

67753

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000365

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000839

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000110

Gnomad OTH exome

AF:

0.000442

GnomAD4 exome

AF:

0.0000911

AC:

100

AN:

1098079

Hom.:

Cov.:

AF XY:

0.000105

AC XY:

AN XY:

363437

show subpopulations

Gnomad4 AFR exome

AF:

0.000189

Gnomad4 AMR exome

AF:

0.0000284

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000905

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000416

Gnomad4 OTH exome

AF:

0.000108

GnomAD4 genome

AF:

0.0000811

AC:

AN:

111015

Hom.:

Cov.:

AF XY:

0.0000603

AC XY:

AN XY:

33189

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:

0.000785

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000113

Gnomad4 OTH

AF:

0.000660

Alfa

AF:

0.000174

Hom.:

Bravo

AF:

0.0000907

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000149

AC:

ExAC

AF:

0.000247

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 28, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.555G>A (p.M185I) alteration is located in exon 1 (coding exon 1) of the NAP1L2 gene. This alteration results from a G to A substitution at nucleotide position 555, causing the methionine (M) at amino acid position 185 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.75

BayesDel_noAF

Benign

-0.93

CADD

Benign

8.4

DANN

Benign

0.91

DEOGEN2

Benign

0.010

FATHMM_MKL

Benign

0.072

LIST_S2

Benign

0.44

M_CAP

Benign

0.0070

MetaRNN

Benign

0.0092

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.94

PrimateAI

Benign

0.46

PROVEAN

Benign

-0.14

REVEL

Benign

0.043

Sift

Benign

0.47

Sift4G

Benign

0.26

Polyphen

0.0

Vest4

0.081

MutPred

0.42

Gain of catalytic residue at M185 (P = 0.0127);

MVP

0.043

MPC

0.23

ClinPred

0.013

GERP RS

1.2

Varity_R

0.065

gMVP

0.17

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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