rs140469160

Variant names:

• chr2-110161604-G-A
• rs140469160
• NM_001128178.3:c.953C>T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The NM_001128178.3(NPHP1):​c.953C>T​(p.Thr318Ile) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000146 in 1,592,154 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00079 (2 hom., cov: 32)
  • Exomes 𝑓: 0.000078 (2 hom.)
• Consequence: NPHP1 NM_001128178.3 missense, splice_region
• Scores: Splicing: ADA: 0.003788
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:2
• Conservation: PhyloP100: 4.97

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]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.020986646).
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000788 (120/152216) while in subpopulation AFR AF= 0.00277 (115/41530). AF 95% confidence interval is 0.00236. There are 2 homozygotes in gnomad4. There are 47 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NPHP1	NM_001128178.3	c.953C>T	p.Thr318Ile	missense_variant, splice_region_variant	Exon 10 of 20	ENST00000445609.7	NP_001121650.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NPHP1	ENST00000445609.7	c.953C>T	p.Thr318Ile	missense_variant, splice_region_variant	Exon 10 of 20	1	NM_001128178.3	ENSP00000389879.3

Frequencies

GnomAD3 genomes AF: 0.000782 AC: 119 AN: 152098 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.00275

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000231 AC: 58 AN: 250946 Hom.: 2 AF XY: 0.000177 AC XY: 24 AN XY: 135606

Gnomad AFR exome AF: 0.00277

Gnomad AMR exome AF: 0.000348

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000785 AC: 113 AN: 1439938 Hom.: 2 Cov.: 27 AF XY: 0.0000725 AC XY: 52 AN XY: 717118

Gnomad4 AFR exome AF: 0.00275

Gnomad4 AMR exome AF: 0.000291

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000234

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.000117

GnomAD4 genome AF: 0.000788 AC: 120 AN: 152216 Hom.: 2 Cov.: 32 AF XY: 0.000632 AC XY: 47 AN XY: 74392

Gnomad4 AFR AF: 0.00277

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000137 Hom.: 1

Bravo AF: 0.00105

ESP6500AA AF: 0.00204 AC: 9

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.000264 AC: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Joubert syndrome with renal defect Uncertain:2

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Sep 19, 2020

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. The c.1756C>T (p.R586*) variant has been previously reported as disease-causing in multiple patients [PMID 10620543, 17855640, 27806791, 25525159] -

not provided Uncertain:2

Nov 26, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Aug 30, 2018

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Senior-Loken syndrome 1 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Nephronophthisis 1 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

NPHP1-related disorder Benign:1

Feb 10, 2022

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Nephronophthisis Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.37	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.21	.;.;T;.;T
Eigen	Uncertain	0.28
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.60	T;T;T;T;T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.021	T;T;T;T;T
MetaSVM	Uncertain	-0.014	T
MutationAssessor	Benign	1.7	.;.;L;.;.
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-2.3	N;N;N;D;D
REVEL	Benign	0.27
Sift	Benign	0.090	T;T;T;T;T
Sift4G	Benign	0.14	T;T;T;T;T
Polyphen		0.99	D;P;P;P;P
Vest4		0.39
MVP		0.91
MPC		0.38
ClinPred		0.054	T
GERP RS		4.4
Varity_R		0.12
gMVP		0.40

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0038
dbscSNV1_RF	Benign	0.024
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: rs140469160; hg19: chr2-110919181;