Genetic Variant NM_015102.5:c.2808G>C (chr1-5877102-C-G) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_015102.5(NPHP4):c.2808G>C(p.Thr936Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,415,952 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. T936T) has been classified as Benign.

Frequency

Genomes: not found (cov: 35)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

NPHP4
NM_015102.5 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.0140

Publications

0 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:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.83).

BP7

Synonymous conserved (PhyloP=-0.014 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NPHP4	NM_015102.5 link	c.2808G>C	p.Thr936Thr	synonymous_variant	Exon 20 of 30	ENST00000378156.9	NP_055917.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
NPHP4	ENST00000378156.9 link	c.2808G>C	p.Thr936Thr	synonymous_variant	Exon 20 of 30	1	NM_015102.5	ENSP00000367398.4	O75161-1
NPHP4	ENST00000378169.7 link	n.*1709G>C		non_coding_transcript_exon_variant	Exon 17 of 27	1		ENSP00000367411.3	D6RA06
NPHP4	ENST00000489180.6 link	n.*356G>C		non_coding_transcript_exon_variant	Exon 21 of 33	2		ENSP00000423747.1	O75161-2
NPHP4	ENST00000378169.7 link	n.*1709G>C		3_prime_UTR_variant	Exon 17 of 27	1		ENSP00000367411.3	D6RA06
NPHP4	ENST00000489180.6 link	n.*356G>C		3_prime_UTR_variant	Exon 21 of 33	2		ENSP00000423747.1	O75161-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.06e-7

AC:

AN:

1415952

Hom.:

Cov.:

AF XY:

0.00000143

AC XY:

AN XY:

697282

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:

32768

American (AMR)

AF:

0.00

AC:

AN:

42950

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24808

East Asian (EAS)

AF:

0.00

AC:

AN:

38462

South Asian (SAS)

AF:

0.00

AC:

AN:

81556

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52028

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5108

European-Non Finnish (NFE)

AF:

9.26e-7

AC:

AN:

1080074

Other (OTH)

AF:

0.00

AC:

AN:

58198

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

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

BayesDel_noAF

Benign

-0.83

CADD

Benign

0.15

(source)

DANN

Benign

0.50

PhyloP100

-0.014

Mutation Taster

=100/0

polymorphism

(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