11-119339173-G-T

Variant names:

• chr11-119339173-G-T
• rs886047817
• NM_031433.4:c.*1786C>A

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_031433.4(MFRP):​c.*1786C>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000923 in 650,162 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 (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000092 (0 hom.)
• Consequence: MFRP NM_031433.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:3
• Conservation: PhyloP100: -0.0380
• Publications: 0 publications found

Genes affected

MFRP (HGNC:18121): (membrane frizzled-related protein) This gene encodes a member of the frizzled-related protein family. The encoded protein plays an important role in eye development and mutations in this gene have been associated with nanophthalmos, posterior microphthalmia, retinitis pigmentosa, foveoschisis, and optic disc drusen. The protein is encoded by a bicistronic transcript which also encodes C1q and tumor necrosis factor related protein 5 (C1QTNF5). [provided by RefSeq, Jun 2013]

C1QTNF5 (HGNC:14344): (C1q and TNF related 5) This gene encodes a member of a family of proteins that function as components of basement membranes and may play a role in cell adhesion. Mutations in this gene have been associated with late-onset retinal degeneration. The protein may be encoded by either a bicistronic transcript including sequence from the upstream membrane frizzled-related protein gene (MFRP), or by a monocistronic transcript expressed from an internal promoter. [provided by RefSeq, Jun 2013]

C1QTNF5 Gene-Disease associations (from GenCC):

• late-onset retinal degeneration

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MFRP	NM_031433.4	c.*1786C>A		3_prime_UTR_variant	Exon 15 of 15	ENST00000619721.6	NP_113621.1
C1QTNF5	NM_001278431.2	c.*158C>A		3_prime_UTR_variant	Exon 3 of 3	ENST00000528368.3	NP_001265360.1
C1QTNF5	NM_015645.5	c.*158C>A		3_prime_UTR_variant	Exon 15 of 15		NP_056460.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MFRP	ENST00000619721.6	c.*1786C>A		3_prime_UTR_variant	Exon 15 of 15	1	NM_031433.4	ENSP00000481824.1
C1QTNF5	ENST00000528368.3	c.*158C>A		3_prime_UTR_variant	Exon 3 of 3	1	NM_001278431.2	ENSP00000431140.1
C1QTNF5	ENST00000530681.2	c.*158C>A		downstream_gene_variant		1		ENSP00000456533.2
C1QTNF5	ENST00000525657.2	n.*197C>A		downstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000923 AC: 6 AN: 650162 Hom.: 0 Cov.: 9 AF XY: 0.00000899 AC XY: 3 AN XY: 333534

African (AFR) AF: 0.00 AC: 0 AN: 16130

American (AMR) AF: 0.00 AC: 0 AN: 19376

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 14928

East Asian (EAS) AF: 0.00 AC: 0 AN: 32068

South Asian (SAS) AF: 0.00 AC: 0 AN: 50158

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 32496

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2558

European-Non Finnish (NFE) AF: 0.0000133 AC: 6 AN: 449750

Other (OTH) AF: 0.00 AC: 0 AN: 32698

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, single submitter

Submissions by phenotype

Retinal degeneration Uncertain:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Isolated microphthalmia 5 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Late-onset retinal degeneration Uncertain:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	9.0
DANN	Benign	0.60
PhyloP100		-0.038

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: rs886047817; hg19: chr11-119209883;