8-10622867-G-T

Variant names:

• chr8-10622867-G-T
• rs6601495
• NM_178857.6:c.335C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_178857.6(RP1L1):​c.335C>A​(p.Thr112Asn) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. 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)
• Consequence: RP1L1 NM_178857.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.60
• Publications: 0 publications found

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]

RP1L1 Gene-Disease associations (from GenCC):

• occult macular dystrophy

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Orphanet, Laboratory for Molecular Medicine
• retinitis pigmentosa

  Inheritance: AD, AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
• retinitis pigmentosa 88

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• cone dystrophy

  Inheritance: AR Classification: LIMITED Submitted by: G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_178857.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RP1L1	NM_178857.6	MANE Select	c.335C>A	p.Thr112Asn	missense	Exon 2 of 4	NP_849188.4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RP1L1	ENST00000382483.4	TSL:1 MANE Select	c.335C>A	p.Thr112Asn	missense	Exon 2 of 4	ENSP00000371923.3	Q8IWN7-1
	RP1L1	ENST00000329335.3	TSL:2	n.585C>A		non_coding_transcript_exon	Exon 2 of 3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.012	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.24	T
Eigen	Uncertain	0.26
Eigen_PC	Benign	0.17
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.72	T
M_CAP	Uncertain	0.28	D
MetaRNN	Uncertain	0.45	T
MetaSVM	Uncertain	0.53	D
MutationAssessor	Benign	1.9	L
PhyloP100		4.6
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.9	N
REVEL	Uncertain	0.34
Sift	Uncertain	0.0060	D
Sift4G	Uncertain	0.0060	D
Vest4		0.44
MutPred		0.29		Loss of phosphorylation at T112 (P = 0.0034)
MVP		0.44
ClinPred		0.76	D
GERP RS		3.9
Varity_R		0.11
gMVP		0.13
Mutation Taster		=82/18	polymorphism

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

Other links and lift over

dbSNP: rs6601495; hg19: chr8-10480377;