4-142122243-C-T

Variant names:

• chr4-142122243-C-T
• rs554325579
• NM_001101669.3:c.2020G>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001101669.3(INPP4B):​c.2020G>A​(p.Asp674Asn) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000554 in 1,606,442 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000056 (1 hom.)
• Consequence: INPP4B NM_001101669.3 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.26

Genes affected

INPP4B (HGNC:6075): (inositol polyphosphate-4-phosphatase type II B) INPP4B encodes the inositol polyphosphate 4-phosphatase type II, one of the enzymes involved in phosphatidylinositol signaling pathways. This enzyme removes the phosphate group at position 4 of the inositol ring from inositol 3,4-bisphosphate. There is limited data to suggest that the human type II enzyme is subject to alternative splicing, as has been established for the type I enzyme. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.083331734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
INPP4B	NM_001101669.3	c.2020G>A	p.Asp674Asn	missense_variant, splice_region_variant	Exon 21 of 26	ENST00000262992.9	NP_001095139.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
INPP4B	ENST00000262992.9	c.2020G>A	p.Asp674Asn	missense_variant, splice_region_variant	Exon 21 of 26	5	NM_001101669.3	ENSP00000262992.4

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152074 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.0000942

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000975 AC: 24 AN: 246116 Hom.: 0 AF XY: 0.000105 AC XY: 14 AN XY: 133062

Gnomad AFR exome AF: 0.000125

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000639

Gnomad FIN exome AF: 0.0000926

Gnomad NFE exome AF: 0.00000894

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000557 AC: 81 AN: 1454250 Hom.: 1 Cov.: 29 AF XY: 0.0000636 AC XY: 46 AN XY: 723714

Gnomad4 AFR exome AF: 0.0000605

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000254

Gnomad4 SAS exome AF: 0.000657

Gnomad4 FIN exome AF: 0.000150

Gnomad4 NFE exome AF: 0.0000108

Gnomad4 OTH exome AF: 0.0000333

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152192 Hom.: 0 Cov.: 32 AF XY: 0.0000807 AC XY: 6 AN XY: 74390

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000414

Gnomad4 FIN AF: 0.0000942

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000151

ExAC AF: 0.000115 AC: 14

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jun 24, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2020G>A (p.D674N) alteration is located in exon 22 (coding exon 18) of the INPP4B gene. This alteration results from a G to A substitution at nucleotide position 2020, causing the aspartic acid (D) at amino acid position 674 to be replaced by an asparagine (N). 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	0.26
BayesDel_addAF	Benign	-0.55	T
BayesDel_noAF	Benign	-0.67
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.24	T;T;T;T;T;.;T
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.94	.;D;.;D;D;D;D
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.083	T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.2	L;L;L;.;.;.;.
PrimateAI	Uncertain	0.53	T
PROVEAN	Uncertain	-2.4	N;N;N;N;D;D;N
REVEL	Benign	0.11
Sift	Benign	0.36	T;T;T;T;T;T;T
Sift4G	Benign	0.18	T;T;T;D;.;.;D
Polyphen		0.51	P;P;P;.;.;.;.
Vest4		0.28
MutPred		0.52		Gain of glycosylation at T671 (P = 0.1647);Gain of glycosylation at T671 (P = 0.1647);Gain of glycosylation at T671 (P = 0.1647);Gain of glycosylation at T671 (P = 0.1647);.;Gain of glycosylation at T671 (P = 0.1647);.;
MVP		0.29
MPC		0.40
ClinPred		0.20	T
GERP RS		5.9
Varity_R		0.14
gMVP		0.39

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

Other links and lift over

dbSNP: rs554325579; hg19: chr4-143043396;