dbSNP rs121907898: NPHP1:p.Leu27Trp (chr2-110201484-A-C) – 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_001128178.3(NPHP1):c.80T>G(p.Leu27Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,456,710 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

NPHP1
NM_001128178.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 3.88

Publications

2 publications found

Variant links:

Genes affected

NPHP1 (HGNC:7905): (nephrocystin 1) This gene encodes a protein with src homology domain 3 (SH3) patterns. This protein interacts with Crk-associated substrate, and it appears to function in the control of cell division, as well as in cell-cell and cell-matrix adhesion signaling, likely as part of a multifunctional complex localized in actin- and microtubule-based structures. Mutations in this gene cause familial juvenile nephronophthisis type 1, a kidney disorder involving both tubules and glomeruli. Defects in this gene are also associated with Senior-Loken syndrome type 1, also referred to as juvenile nephronophthisis with Leber amaurosis, which is characterized by kidney and eye disease, and with Joubert syndrome type 4, which is characterized by cerebellar ataxia, oculomotor apraxia, psychomotor delay and neonatal breathing abnormalities, sometimes including retinal dystrophy and renal disease. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

NPHP1 Gene-Disease associations (from GenCC):

Joubert syndrome with renal defect
Inheritance: AR Classification: DEFINITIVE, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, G2P
nephronophthisis 1
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, ClinGen, Labcorp Genetics (formerly Invitae)
Bardet-Biedl syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Senior-Loken syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

NPHP1 links:

Genome browser will be placed here

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;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NPHP1	NM_001128178.3 link	c.80T>G	p.Leu27Trp	missense_variant	Exon 2 of 20	ENST00000445609.7	NP_001121650.1	O15259-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NPHP1	ENST00000445609.7 link	c.80T>G	p.Leu27Trp	missense_variant	Exon 2 of 20	1	NM_001128178.3	ENSP00000389879.3		O15259-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000401

AC:

AN:

249604

AF XY:

0.00

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:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1456710

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

724980

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

33432

American (AMR)

AF:

0.00

AC:

AN:

44670

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26060

East Asian (EAS)

AF:

0.00

AC:

AN:

39630

South Asian (SAS)

AF:

0.00

AC:

AN:

86064

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52454

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5628

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1108542

Other (OTH)

AF:

0.00

AC:

AN:

60230

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000203476), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.75

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Uncertain

-0.080

CADD

Pathogenic

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.22

.;.;T;.;T;.

Eigen

Uncertain

0.62

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Uncertain

0.90

LIST_S2

Benign

0.82

T;T;T;T;T;T

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.54

D;D;D;D;D;D

MetaSVM

Uncertain

0.13

MutationAssessor

Uncertain

2.7

M;M;M;M;.;.

PhyloP100

3.9

PrimateAI

Uncertain

0.59

PROVEAN

Uncertain

-2.4

N;D;N;D;D;D

REVEL

Uncertain

0.41

Sift

Uncertain

0.0010

D;D;D;D;D;D

Sift4G

Uncertain

0.0060

D;D;D;D;D;D

Polyphen

1.0

D;D;D;D;D;D

Vest4

0.47

MutPred

0.37

Gain of MoRF binding (P = 0.0353);Gain of MoRF binding (P = 0.0353);Gain of MoRF binding (P = 0.0353);Gain of MoRF binding (P = 0.0353);Gain of MoRF binding (P = 0.0353);Gain of MoRF binding (P = 0.0353);

MVP

0.92

MPC

0.57

ClinPred

0.96

GERP RS

5.3

PromoterAI

-0.00040

Neutral

(source)

Varity_R

0.26

gMVP

0.56

Mutation Taster

=29/71

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over