Genetic Variant NPHP4:p.Gln45Lys (chr1-5986157-G-T) – 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_015102.5(NPHP4):c.133C>A(p.Gln45Lys) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00000274 in 1,461,496 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q45R) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

NPHP4
NM_015102.5 missense, splice_region

Scores

Splicing: ADA: 0.9548

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.10

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:

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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;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015102.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NPHP4	NM_015102.5	MANE Select	c.133C>A	p.Gln45Lys	missense splice_region	Exon 2 of 30	NP_055917.1
NPHP4	NM_001291593.2		c.-1097C>A		splice_region	Exon 2 of 27	NP_001278522.1
NPHP4	NR_111987.2		n.353C>A		splice_region non_coding_transcript_exon	Exon 2 of 33

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NPHP4	ENST00000378156.9	TSL:1 MANE Select	c.133C>A	p.Gln45Lys	missense splice_region	Exon 2 of 30	ENSP00000367398.4
NPHP4	ENST00000378169.7	TSL:1	n.133C>A		splice_region non_coding_transcript_exon	Exon 2 of 27	ENSP00000367411.3
NPHP4	ENST00000489180.6	TSL:2	n.133C>A		splice_region non_coding_transcript_exon	Exon 2 of 33	ENSP00000423747.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461496

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727004

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33472

American (AMR)

AF:

0.00

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86206

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53346

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000360

AC:

AN:

1111798

Other (OTH)

AF:

0.00

AC:

AN:

60368

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.463

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Uncertain

0.10

BayesDel_noAF

Benign

-0.090

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.15

Eigen

Uncertain

0.32

Eigen_PC

Uncertain

0.35

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.79

M_CAP

Benign

0.068

MetaRNN

Uncertain

0.43

MetaSVM

Uncertain

0.051

MutationAssessor

Uncertain

2.3

PhyloP100

5.1

PrimateAI

Benign

0.37

PROVEAN

Benign

-1.2

REVEL

Uncertain

0.36

Sift

Benign

0.066

Sift4G

Benign

0.16

Polyphen

0.87

Vest4

0.51

MutPred

0.42

Gain of ubiquitination at Q45 (P = 0.0219)

MVP

0.92

MPC

0.22

ClinPred

0.90

GERP RS

5.7

Varity_R

0.19

gMVP

0.51

Mutation Taster

=81/19

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.95

dbscSNV1_RF

Benign

0.71

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over