3-132722196-C-T

Position:

• chr3-132722196-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_153240.5(NPHP3):​c.160G>A​(p.Gly54Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000737 in 1,356,536 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.4e-7 (0 hom.)
• Consequence: NPHP3 NM_153240.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.497

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-AS1 (HGNC:24129): (NPHP3 antisense RNA 1)

NPHP3-ACAD11 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29866365).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NPHP3	NM_153240.5	c.160G>A	p.Gly54Arg	missense_variant	1/27	ENST00000337331.10	NP_694972.3
NPHP3-AS1	NR_002811.2	n.447C>T		non_coding_transcript_exon_variant	1/11
NPHP3-ACAD11	NR_037804.1	n.264G>A		non_coding_transcript_exon_variant	1/45
NPHP3-AS1	NR_152743.1	n.447C>T		non_coding_transcript_exon_variant	1/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NPHP3	ENST00000337331.10	c.160G>A	p.Gly54Arg	missense_variant	1/27	1	NM_153240.5	ENSP00000338766	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.37e-7 AC: 1 AN: 1356536 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 670872

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.35e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Nephronophthisis Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 31, 2022

This variant has not been reported in the literature in individuals affected with NPHP3-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 54 of the NPHP3 protein (p.Gly54Arg). ClinVar contains an entry for this variant (Variation ID: 531628). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Uncertain	0.054	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	14
DANN	Uncertain	0.99
DEOGEN2	Benign	0.12	T;.
Eigen	Benign	-0.69
Eigen_PC	Benign	-0.85
FATHMM_MKL	Benign	0.062	N
LIST_S2	Benign	0.71	T;T
M_CAP	Pathogenic	0.73	D
MetaRNN	Benign	0.30	T;T
MetaSVM	Benign	-0.47	T
MutationAssessor	Benign	0.0	N;N
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Pathogenic	0.87	D
PROVEAN	Benign	0.32	N;N
REVEL	Benign	0.20
Sift	Benign	0.10	T;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.98	D;.
Vest4		0.31
MutPred		0.44		Gain of methylation at G54 (P = 0.0053);Gain of methylation at G54 (P = 0.0053);
MVP		0.79
MPC		0.32
ClinPred		0.36	T
GERP RS		1.0
Varity_R		0.041
gMVP		0.10

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

LitVar

Other links and lift over

dbSNP: rs1054438148; hg19: chr3-132441040;