8-54616109-G-A

Position:

• chr8-54616109-G-A

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 2P and 10B. PM2 BP4_Strong BP6_Moderate BS1

The NM_006269.2(RP1):​c.-106G>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00127 in 152,304 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0013 (1 hom., cov: 33)
  • Failed GnomAD Quality Control
• Consequence: RP1 NM_006269.2 5_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.333

Genes affected

RP1 (HGNC:10263): (RP1 axonemal microtubule associated) This gene encodes a member of the doublecortin family. The protein encoded by this gene contains two doublecortin domains, which bind microtubules and regulate microtubule polymerization. The encoded protein is a photoreceptor microtubule-associated protein and is required for correct stacking of outer segment disc. This protein and the RP1L1 protein, another retinal-specific protein, play essential and synergistic roles in affecting photosensitivity and outer segment morphogenesis of rod photoreceptors. Because of its response to in vivo retinal oxygen levels, this protein was initially named ORP1 (oxygen-regulated protein-1). This protein was subsequently designated RP1 (retinitis pigmentosa 1) when it was found that mutations in this gene cause autosomal dominant retinitis pigmentosa. Mutations in this gene also cause autosomal recessive retinitis pigmentosa. Transcript variants resulted from an alternative promoter and alternative splicings have been found, which overlap the current reference sequence and has several exons upstream and downstream of the current reference sequence. However, the biological validity and full-length nature of some variants cannot be determined at this time.[provided by RefSeq, Sep 2010]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 8-54616109-G-A is Benign according to our data. Variant chr8-54616109-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 363274.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.00127 (194/152304) while in subpopulation SAS AF= 0.00912 (44/4824). AF 95% confidence interval is 0.00698. There are 1 homozygotes in gnomad4. There are 90 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RP1	NM_006269.2	c.-106G>A		5_prime_UTR_variant	1/4	ENST00000220676.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RP1	ENST00000220676.2	c.-106G>A		5_prime_UTR_variant	1/4	1	NM_006269.2
RP1	ENST00000637698.1	c.-106G>A		5_prime_UTR_variant	1/29	5		P1
RP1	ENST00000636932.1	c.-12-4846G>A		intron_variant		5

Frequencies

GnomAD3 genomes AF: 0.00127 AC: 194 AN: 152186 Hom.: 1 Cov.: 33

Gnomad AFR AF: 0.000145

Gnomad AMI AF: 0.00110

Gnomad AMR AF: 0.00124

Gnomad ASJ AF: 0.00950

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00911

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.00122

Gnomad OTH AF: 0.00144

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.00127 AC: 194 AN: 152304 Hom.: 1 Cov.: 33 AF XY: 0.00121 AC XY: 90 AN XY: 74488

Gnomad4 AFR AF: 0.000144

Gnomad4 AMR AF: 0.00124

Gnomad4 ASJ AF: 0.00950

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.00912

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00122

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00147 Hom.: 0

Bravo AF: 0.00124

Asia WGS AF: 0.00144 AC: 5 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Retinitis pigmentosa Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
CADD	Benign	14
DANN	Benign	0.80

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: rs142681427; hg19: chr8-55528669;