chr17-17795908-CAAAG-C

Position:

• chr17-17795908-CAAAG-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The ENST00000353383.6(RAI1):​c.2966_2969del​(p.Lys989SerfsTer74) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: RAI1 ENST00000353383.6 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 4.29

Genes affected

RAI1 (HGNC:9834): (retinoic acid induced 1) This gene is located within the Smith-Magenis syndrome region on chromosome 17. It is highly similar to its mouse counterpart and is expressed at high levels mainly in neuronal tissues. The protein encoded by this gene includes a polymorphic polyglutamine tract in the N-terminal domain. Expression of the mouse counterpart in neurons is induced by retinoic acid. This gene is associated with both the severity of the phenotype and the response to medication in schizophrenic patients. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-17795908-CAAAG-C is Pathogenic according to our data. Variant chr17-17795908-CAAAG-C is described in ClinVar as [Pathogenic]. Clinvar id is 431118.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RAI1	NM_030665.4	c.2966_2969del	p.Lys989SerfsTer74	frameshift_variant	3/6	ENST00000353383.6	NP_109590.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RAI1	ENST00000353383.6	c.2966_2969del	p.Lys989SerfsTer74	frameshift_variant	3/6	1	NM_030665.4	ENSP00000323074	P1

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Aug 12, 2022	Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 28708303) -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 18, 2023	This sequence change creates a premature translational stop signal (p.Lys989Serfs*74) in the RAI1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in RAI1 are known to be pathogenic (PMID: 21857958, 24715852). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with a neurodevelopmental condition (PMID: 28708303). ClinVar contains an entry for this variant (Variation ID: 431118). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Clinical Genetics Laboratory, Skane University Hospital Lund	Jul 21, 2022	- -

Smith-Magenis syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Groupe Hospitalier Pitie Salpetriere, UF Genomique du Developpement, Assistance Publique Hopitaux de Paris	Jan 06, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Institute for Genomic Statistics and Bioinformatics, University Hospital Bonn	Mar 10, 2022	- -

Inborn genetic diseases Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 29, 2021

The c.2966_2969delAAGA (p.K989Sfs*74) alteration, located in exon 3 (coding exon 1) of the RAI1 gene, consists of a deletion of 4 nucleotides from position 2966 to 2969, causing a translational frameshift with a predicted alternate stop codon after 74 amino acids. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This mutation was identified once in a cohort of individuals with presumed genetic neurodevelopmental disorders via whole exome sequencing (Chérot, 2018). Based on the available evidence, this alteration is classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

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: rs1135401792; hg19: chr17-17699222;