17-8003087-C-G

Variant names:

• chr17-8003087-C-G
• rs1975658549
• NM_000180.4:c.40C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000180.4(GUCY2D):​c.40C>G​(p.Pro14Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000728 in 1,373,116 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict 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. P14T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: GUCY2D NM_000180.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.171
• Publications: 0 publications found

Genes affected

GUCY2D (HGNC:4689): (guanylate cyclase 2D, retinal) This gene encodes a retina-specific guanylate cyclase, which is a member of the membrane guanylyl cyclase family. Like other membrane guanylyl cyclases, this enzyme has a hydrophobic amino-terminal signal sequence followed by a large extracellular domain, a single membrane spanning domain, a kinase homology domain, and a guanylyl cyclase catalytic domain. In contrast to other membrane guanylyl cyclases, this enzyme is not activated by natriuretic peptides. Mutations in this gene result in Leber congenital amaurosis and cone-rod dystrophy-6 diseases. [provided by RefSeq, Dec 2008]

GUCY2D Gene-Disease associations (from GenCC):

• cone-rod dystrophy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
• GUCY2D-related dominant retinopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• GUCY2D-related recessive retinopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Leber congenital amaurosis 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• cone-rod dystrophy 6

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• night blindness, congenital stationary, type1i

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Leber congenital amaurosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• central areolar choroidal dystrophy

  Inheritance: AR, AD Classification: SUPPORTIVE, LIMITED Submitted by: G2P, Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 55 curated pathogenic missense variants (we use a threshold of 10). The gene has 15 curated benign missense variants. Gene score misZ: 0.78087 (below the threshold of 3.09). Trascript score misZ: 0.0082692 (below the threshold of 3.09). GenCC associations: The gene is linked to Leber congenital amaurosis 1, GUCY2D-related dominant retinopathy, central areolar choroidal dystrophy, cone-rod dystrophy, cone-rod dystrophy 6, night blindness, congenital stationary, type1i, GUCY2D-related recessive retinopathy, Leber congenital amaurosis.
• BP4: Computational evidence support a benign effect (MetaRNN=0.101742536).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GUCY2D	NM_000180.4	c.40C>G	p.Pro14Ala	missense_variant	Exon 2 of 20	ENST00000254854.5	NP_000171.1
GUCY2D	XM_011523816.2	c.40C>G	p.Pro14Ala	missense_variant	Exon 1 of 19		XP_011522118.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GUCY2D	ENST00000254854.5	c.40C>G	p.Pro14Ala	missense_variant	Exon 2 of 20	1	NM_000180.4	ENSP00000254854.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.28e-7 AC: 1 AN: 1373116 Hom.: 0 Cov.: 32 AF XY: 0.00000148 AC XY: 1 AN XY: 677444

African (AFR) AF: 0.00 AC: 0 AN: 29760

American (AMR) AF: 0.00 AC: 0 AN: 34814

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24776

East Asian (EAS) AF: 0.00 AC: 0 AN: 34656

South Asian (SAS) AF: 0.00 AC: 0 AN: 77416

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 34148

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5292

European-Non Finnish (NFE) AF: 9.30e-7 AC: 1 AN: 1074818

Other (OTH) AF: 0.00 AC: 0 AN: 57436

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Choroidal dystrophy, central areolar, 1 Uncertain:1

Mar 31, 2019

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was classified as: Uncertain significance. The following ACMG criteria were applied in classifying this variant: PM2. -

Cone-rod dystrophy 6;C2931258:Leber congenital amaurosis 1 Uncertain:1

Jul 07, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals affected with GUCY2D-related conditions. ClinVar contains an entry for this variant (Variation ID: 931521). 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 GUCY2D 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. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 14 of the GUCY2D protein (p.Pro14Ala). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.046
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	8.5
DANN	Benign	0.48
DEOGEN2	Benign	0.089	T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.011	N
LIST_S2	Benign	0.45	T
M_CAP	Pathogenic	0.59	D
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.22	N
PhyloP100		0.17
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.39	N
REVEL	Benign	0.17
Sift	Benign	0.37	T
Sift4G	Benign	1.0	T
Polyphen		0.0	B
Vest4		0.19
MutPred		0.23		Loss of glycosylation at P14 (P = 0.055);
MVP		0.40
MPC		1.3
ClinPred		0.077	T
GERP RS		-2.7
PromoterAI		0.048	Neutral
Varity_R		0.033
gMVP		0.36

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: rs1975658549; hg19: chr17-7906405;