14-21345198-G-T

Variant names:

• chr14-21345198-G-T
• rs771116776
• NM_020366.4:c.3617+1G>T

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_020366.4(RPGRIP1):​c.3617+1G>T variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.0000117 in 1,454,810 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: RPGRIP1 NM_020366.4 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.55
• Publications: 0 publications found

Genes affected

RPGRIP1 (HGNC:13436): (RPGR interacting protein 1) This gene encodes a photoreceptor protein that interacts with retinitis pigmentosa GTPase regulator protein and is a key component of cone and rod photoreceptor cells. Mutations in this gene lead to autosomal recessive congenital blindness. [provided by RefSeq, Oct 2008]

RPGRIP1 Gene-Disease associations (from GenCC):

• cone-rod dystrophy 13

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• Leber congenital amaurosis 6

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• cone-rod dystrophy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Leber congenital amaurosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PP5: Variant 14-21345198-G-T is Pathogenic according to our data. Variant chr14-21345198-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 1436742.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020366.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RPGRIP1	NM_020366.4	MANE Select	c.3617+1G>T		splice_donor intron	N/A	NP_065099.3
	RPGRIP1	NM_001377948.1		c.2543+1G>T		splice_donor intron	N/A	NP_001364877.1
	RPGRIP1	NM_001377949.1		c.1703+1G>T		splice_donor intron	N/A	NP_001364878.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RPGRIP1	ENST00000400017.7	TSL:1 MANE Select	c.3617+1G>T		splice_donor intron	N/A	ENSP00000382895.2
	RPGRIP1	ENST00000555587.5	TSL:1	c.2042+1G>T		splice_donor intron	N/A	ENSP00000451262.1
	RPGRIP1	ENST00000382933.8	TSL:1	c.1595+1G>T		splice_donor intron	N/A	ENSP00000372391.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000810 AC: 2 AN: 246912 AF XY: 0.0000149

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS 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: 0.0000117 AC: 17 AN: 1454810 Hom.: 0 Cov.: 27 AF XY: 0.00000967 AC XY: 7 AN XY: 723872

African (AFR) AF: 0.00 AC: 0 AN: 33280

American (AMR) AF: 0.00 AC: 0 AN: 44252

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26042

East Asian (EAS) AF: 0.00 AC: 0 AN: 39650

South Asian (SAS) AF: 0.00 AC: 0 AN: 85366

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53364

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 0.0000154 AC: 17 AN: 1106958

Other (OTH) AF: 0.00 AC: 0 AN: 60144

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000611 Hom.: 0

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leber congenital amaurosis 6;C2750720:Cone-rod dystrophy 13 Pathogenic:1

Aug 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects a donor splice site in intron 22 of the RPGRIP1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in RPGRIP1 are known to be pathogenic (PMID: 11528500, 23105016). This variant is present in population databases (rs771116776, gnomAD 0.002%). Disruption of this splice site has been observed in individual(s) with Leber congenital amaurosis (PMID: 26047050). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 1436742). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.61	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	28
DANN	Uncertain	0.99
Eigen	Pathogenic	0.95
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.94	D
PhyloP100		4.5
GERP RS		5.0
Mutation Taster		=0/100	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.91
SpliceAI score (max)		0.99		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.99		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs771116776; hg19: chr14-21813357;