Genetic Variant NAP1L2:p.Ala226Ser (chrX-73213817-C-A) – 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.676G>T(p.Ala226Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000174 in 1,208,310 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 8 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 1 hem., cov: 22)

Exomes 𝑓: 0.000017 ( 0 hom. 7 hem. )

Consequence

NAP1L2
NM_021963.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.72

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=0.019113809).

BS2

High Hemizygotes in GnomAdExome4 at 7 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NAP1L2	NM_021963.4 link	c.676G>T	p.Ala226Ser	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.676G>T	p.Ala226Ser	missense_variant	Exon 1 of 1	6	NM_021963.4	ENSP00000362616.3		Q9ULW6-1

Frequencies

GnomAD3 genomes

AF:

0.0000181

AC:

AN:

110369

Hom.:

Cov.:

AF XY:

0.0000307

AC XY:

AN XY:

32595

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:

0.000571

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

GnomAD3 exomes

AF:

0.000104

AC:

AN:

182699

Hom.:

AF XY:

0.0000892

AC XY:

AN XY:

67251

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00137

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000173

AC:

AN:

1097941

Hom.:

Cov.:

AF XY:

0.0000193

AC XY:

AN XY:

363317

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000530

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000651

GnomAD4 genome

AF:

0.0000181

AC:

AN:

110369

Hom.:

Cov.:

AF XY:

0.0000307

AC XY:

AN XY:

32595

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000571

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.000115

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 16, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.676G>T (p.A226S) alteration is located in exon 1 (coding exon 1) of the NAP1L2 gene. This alteration results from a G to T substitution at nucleotide position 676, causing the alanine (A) at amino acid position 226 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.086

BayesDel_addAF

Benign

-0.67

BayesDel_noAF

Benign

-0.77

CADD

Benign

DANN

Benign

0.85

DEOGEN2

Benign

0.012

FATHMM_MKL

Uncertain

0.82

LIST_S2

Benign

0.48

M_CAP

Benign

0.0049

MetaRNN

Benign

0.019

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.8

PrimateAI

Benign

0.38

PROVEAN

Benign

-0.14

REVEL

Benign

0.11

Sift

Benign

0.24

Sift4G

Benign

0.15

Polyphen

0.22

Vest4

0.16

MutPred

0.44

Gain of phosphorylation at A226 (P = 0.0023);

MVP

0.41

MPC

0.32

ClinPred

0.058

GERP RS

2.1

Varity_R

0.10

gMVP

0.10

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