Genetic Variant NPHP4:p.Arg740Leu (chr1-5890953-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_015102.5(NPHP4):c.2219G>T(p.Arg740Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,450,580 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R740H) has been classified as Benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

NPHP4
NM_015102.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.523

Publications

19 publications found

Variant links:

Genes affected

NPHP4 (HGNC:19104): (nephrocystin 4) This gene encodes a protein involved in renal tubular development and function. This protein interacts with nephrocystin, and belongs to a multifunctional complex that is localized to actin- and microtubule-based structures. Mutations in this gene are associated with nephronophthisis type 4, a renal disease, and with Senior-Loken syndrome type 4, a combination of nephronophthisis and retinitis pigmentosa. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2014]

NPHP4 Gene-Disease associations (from GenCC):

nephronophthisis 4
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae), G2P
Senior-Loken syndrome 4
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
nephronophthisis 1
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Senior-Loken syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

NPHP4 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015102.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NPHP4	NM_015102.5	MANE Select	c.2219G>T	p.Arg740Leu	missense	Exon 17 of 30	NP_055917.1
NPHP4	NM_001291594.2		c.683G>T	p.Arg228Leu	missense	Exon 13 of 26	NP_001278523.1
NPHP4	NM_001291593.2		c.680G>T	p.Arg227Leu	missense	Exon 14 of 27	NP_001278522.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NPHP4	ENST00000378156.9	TSL:1 MANE Select	c.2219G>T	p.Arg740Leu	missense	Exon 17 of 30	ENSP00000367398.4
NPHP4	ENST00000378169.7	TSL:1	n.*1120G>T		non_coding_transcript_exon	Exon 14 of 27	ENSP00000367411.3
NPHP4	ENST00000466897.1	TSL:1	n.296G>T		non_coding_transcript_exon	Exon 3 of 6	ENSP00000425745.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000417

AC:

AN:

239630

AF XY:

0.00000766

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000138

AC:

AN:

1450580

Hom.:

Cov.:

AF XY:

0.00000278

AC XY:

AN XY:

719680

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33308

American (AMR)

AF:

0.00

AC:

AN:

44188

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25940

East Asian (EAS)

AF:

0.00

AC:

AN:

39316

South Asian (SAS)

AF:

0.0000235

AC:

AN:

85152

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52710

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5742

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1104348

Other (OTH)

AF:

0.00

AC:

AN:

59876

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.675

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000827

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.037

BayesDel_noAF

Benign

-0.19

CADD

Benign

0.30

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.39

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.11

LIST_S2

Benign

0.81

M_CAP

Benign

0.084

MetaRNN

Uncertain

0.62

MetaSVM

Benign

-0.30

MutationAssessor

Uncertain

2.3

PhyloP100

-0.52

PrimateAI

Benign

0.21

PROVEAN

Uncertain

-4.1

REVEL

Uncertain

0.37

Sift

Uncertain

0.026

Sift4G

Uncertain

0.013

Polyphen

0.85

Vest4

0.62

MutPred

0.32

Gain of methylation at R736 (P = 0.1109)

MVP

0.82

MPC

0.37

ClinPred

0.89

GERP RS

-7.2

Varity_R

0.11

gMVP

0.45

Mutation Taster

=93/7

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over