rs6601495

Positions:

• chr8-10622867-G-A
• chr8-10622867-G-C
• chr8-10622867-G-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4

The NM_178857.6(RP1L1):​c.335C>T​(p.Thr112Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000011 in 1,461,020 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T112S) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: RP1L1 NM_178857.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.60

Genes affected

RP1L1 (HGNC:15946): (RP1 like 1) This gene encodes a member of the doublecortin family. The protein encoded by this gene contains two N-terminal doublecortin domains, which bind microtubules and regulate microtubule polymerization, and two C-terminal large repetitive regions, both of which contain a high percentage of glutamine and glutamic acid residues. This protein is a retinal-specific protein. Its exact length varies among individuals due to the presence of a 16aa repeat in the first C-terminal repetitive region. The 16aa repeat is encoded by the highly polymorphic 48-bp repeat, and 1-6 copies of the 16aa repeat have been identified in normal individuals. The current reference sequence shown here has a single copy of the 16aa repeat. This protein and the RP1 protein, another retinal-specific protein, play essential and synergistic roles in affecting photosensitivity and outer segment morphogenesis of rod photoreceptors. Mutations in this gene cause occult macular dystrophy (OMD). [provided by RefSeq, Sep 2010]

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.3335827).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RP1L1	NM_178857.6	c.335C>T	p.Thr112Ile	missense_variant	2/4	ENST00000382483.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RP1L1	ENST00000382483.4	c.335C>T	p.Thr112Ile	missense_variant	2/4	1	NM_178857.6	P1
RP1L1	ENST00000329335.3	n.585C>T		non_coding_transcript_exon_variant	2/3	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.0000163 AC: 4 AN: 244860 Hom.: 0 AF XY: 0.0000225 AC XY: 3 AN XY: 133522

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000562

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.0000468

Gnomad NFE exome AF: 0.00000907

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000110 AC: 16 AN: 1461020 Hom.: 0 Cov.: 32 AF XY: 0.0000124 AC XY: 9 AN XY: 726724

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 0.00000720

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome Cov.: 31

ExAC AF: 0.0000249 AC: 3

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 10, 2023

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 112 of the RP1L1 protein (p.Thr112Ile). This variant is present in population databases (rs6601495, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with RP1L1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1406430). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt RP1L1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.20	T
Eigen	Uncertain	0.26
Eigen_PC	Benign	0.17
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.65	T
M_CAP	Pathogenic	0.33	D
MetaRNN	Benign	0.33	T
MetaSVM	Uncertain	0.53	D
MutationAssessor	Benign	1.2	L
MutationTaster	Benign	0.49	P
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-0.81	N
REVEL	Uncertain	0.34
Sift	Uncertain	0.011	D
Sift4G	Uncertain	0.0040	D
Vest4		0.42
MutPred		0.27		Loss of phosphorylation at T112 (P = 0.0034);
MVP		0.37
ClinPred		0.53	D
GERP RS		3.9
Varity_R		0.065
gMVP		0.19

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: rs6601495; hg19: chr8-10480377;