NM_020448.5:c.381G>T

Variant names:

• chr1-24445231-G-T
• rs144375095
• NM_020448.5:c.381G>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_020448.5(NIPAL3):​c.381G>T​(p.Pro127Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,456,626 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. Synonymous variant affecting the same amino acid position (i.e. P127P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NIPAL3 NM_020448.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.173
• Publications: 0 publications found

Genes affected

NIPAL3 (HGNC:25233): (NIPA like domain containing 3) Predicted to enable magnesium ion transmembrane transporter activity. Predicted to be involved in magnesium ion transport. Predicted to be integral component of membrane. Predicted to be active in membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

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=-0.69).
• BP7: Synonymous conserved (PhyloP=-0.173 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NIPAL3	NM_020448.5	c.381G>T	p.Pro127Pro	synonymous_variant	Exon 5 of 12	ENST00000374399.9	NP_065181.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NIPAL3	ENST00000374399.9	c.381G>T	p.Pro127Pro	synonymous_variant	Exon 5 of 12	1	NM_020448.5	ENSP00000363520.4
NIPAL3	ENST00000003912.9	c.135G>T	p.Pro45Pro	synonymous_variant	Exon 6 of 13	1		ENSP00000003912.3
NIPAL3	ENST00000358028.8	c.381G>T	p.Pro127Pro	synonymous_variant	Exon 5 of 8	1		ENSP00000350722.4
NIPAL3	ENST00000339255.2	c.381G>T	p.Pro127Pro	synonymous_variant	Exon 5 of 12	5		ENSP00000343549.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1456626 Hom.: 0 Cov.: 27 AF XY: 0.00000138 AC XY: 1 AN XY: 725000

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33388

American (AMR) AF: 0.00 AC: 0 AN: 44676

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39672

South Asian (SAS) AF: 0.00 AC: 0 AN: 86104

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53398

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5748

European-Non Finnish (NFE) AF: 9.03e-7 AC: 1 AN: 1107302

Other (OTH) AF: 0.0000166 AC: 1 AN: 60230

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
CADD	Benign	5.4
DANN	Benign	0.62
PhyloP100		-0.17
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs144375095; hg19: chr1-24771721;