rs758498695

Positions:

• chr3-132713256-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_153240.5(NPHP3):​c.988G>A​(p.Glu330Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000186 in 1,450,254 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000019 (0 hom.)
• Consequence: NPHP3 NM_153240.5 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.29

Genes affected

NPHP3 (HGNC:7907): (nephrocystin 3) This gene encodes a protein containing a coiled-coil (CC) domain, a tubulin-tyrosine ligase (TTL) domain, and a tetratrico peptide repeat (TPR) domain. The encoded protein interacts with nephrocystin, it is required for normal ciliary development, and it functions in renal tubular development. Mutations in this gene are associated with nephronophthisis type 3, and also with renal-hepatic-pancreatic dysplasia, and Meckel syndrome type 7. Naturally occurring read-through transcripts exist between this gene and the downstream ACAD11 (acyl-CoA dehydrogenase family, member 11) gene. [provided by RefSeq, Feb 2011]

NPHP3-ACAD11 (HGNC:48351): (NPHP3-ACAD11 readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring NPHP3 (nephronophthisis 3, adolescent) and ACAD11 (acyl-CoA dehydrogenase family, member 11) genes on chromosome 3. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is thus unlikely to produce a protein product. [provided by RefSeq, Feb 2011]

NPHP3 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.85
• PP5: Variant 3-132713256-C-T is Pathogenic according to our data. Variant chr3-132713256-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 216011.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NPHP3	NM_153240.5	c.988G>A	p.Glu330Lys	missense_variant	6/27	ENST00000337331.10	NP_694972.3
NPHP3-ACAD11	NR_037804.1	n.1092G>A		non_coding_transcript_exon_variant	6/45

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NPHP3	ENST00000337331.10	c.988G>A	p.Glu330Lys	missense_variant	6/27	1	NM_153240.5	ENSP00000338766.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000122 AC: 3 AN: 245392 Hom.: 0 AF XY: 0.00000753 AC XY: 1 AN XY: 132754

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000553

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000178

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000186 AC: 27 AN: 1450254 Hom.: 0 Cov.: 28 AF XY: 0.0000208 AC XY: 15 AN XY: 721538

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000255

Gnomad4 SAS exome AF: 0.0000237

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000217

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

Asia WGS AF: 0.000291 AC: 1 AN: 3448

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Nephronophthisis Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 04, 2023

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 330 of the NPHP3 protein (p.Glu330Lys). This variant is present in population databases (rs758498695, gnomAD 0.006%). This missense change has been observed in individual(s) with clinical features of NPHP3-related conditions (Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 216011). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on NPHP3 protein function. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	28
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.31	T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Uncertain	0.70	D
MutationAssessor	Uncertain	2.1	M
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-1.3	N
REVEL	Uncertain	0.56
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.0070	D
Polyphen		1.0	D
Vest4		0.93
MutPred		0.38		Gain of methylation at E330 (P = 0.0011);
MVP		0.95
MPC		0.66
ClinPred		0.90	D
GERP RS		6.0
Varity_R		0.37
gMVP		0.76

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

Publications

LitVar

Other links and lift over

dbSNP: rs758498695; hg19: chr3-132432100; COSMIC: COSV58128352; COSMIC: COSV58128352;