Genetic Variant NPHP3:c.393+127C>A (chr3-132721836-G-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_153240.5(NPHP3):c.393+127C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000103 in 971,588 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.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000010 ( 0 hom. )

Consequence

NPHP3
NM_153240.5 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.102

Publications

0 publications found

Variant links:

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 links:

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

NPHP3-AS1 links:

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-ACAD11 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_153240.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
NPHP3	NM_153240.5	MANE Select	c.393+127C>A	intron	N/A	NP_694972.3
NPHP3-AS1	NR_002811.2		n.87G>T	non_coding_transcript_exon	Exon 1 of 11
NPHP3-AS1	NR_152743.1		n.87G>T	non_coding_transcript_exon	Exon 1 of 5

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
NPHP3	ENST00000337331.10	TSL:1 MANE Select	c.393+127C>A	intron	N/A	ENSP00000338766.5	Q7Z494-1
NPHP3	ENST00000383282.3	TSL:1	c.394-62C>A	intron	N/A	ENSP00000372769.2	Q7Z494-7
NPHP3-AS1	ENST00000489343.5	TSL:1	n.87G>T	non_coding_transcript_exon	Exon 1 of 5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000103

AC:

AN:

971588

Hom.:

Cov.:

AF XY:

0.00000202

AC XY:

AN XY:

495080

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:

23594

American (AMR)

AF:

0.00

AC:

AN:

34786

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

22486

East Asian (EAS)

AF:

0.00

AC:

AN:

33846

South Asian (SAS)

AF:

0.00

AC:

AN:

70258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

35192

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4906

European-Non Finnish (NFE)

AF:

0.00000142

AC:

AN:

702392

Other (OTH)

AF:

0.00

AC:

AN:

44128

⚠️ 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

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

BayesDel_noAF

Benign

-0.83

CADD

Benign

6.4

(source)

DANN

Benign

0.82

PhyloP100

0.10

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over