chr6-42173699-G-A

Position:

• chr6-42173699-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001384910.1(GUCA1A):​c.86G>A​(p.Cys29Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,290 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GUCA1A NM_001384910.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.09

Genes affected

GUCA1A (HGNC:4678): (guanylate cyclase activator 1A) This gene encodes an enzyme that plays a role in the recovery of retinal photoreceptors from photobleaching. This enzyme promotes the activity of retinal guanylyl cyclase-1 (GC1) at low calcium concentrations and inhibits GC1 at high calcium concentrations. Mutations in this gene can cause cone dystrophy 3 and code-rod dystrophy 14. provided by RefSeq, Jul 2020]

GUCA1ANB-GUCA1A (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.935

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GUCA1A	NM_001384910.1	c.86G>A	p.Cys29Tyr	missense_variant	1/4	ENST00000372958.2	NP_001371839.1
GUCA1ANB-GUCA1A	NM_001319061.2	c.86G>A	p.Cys29Tyr	missense_variant	3/6		NP_001305990.1
GUCA1ANB-GUCA1A	NM_000409.5	c.86G>A	p.Cys29Tyr	missense_variant	3/6		NP_000400.2
GUCA1ANB-GUCA1A	NM_001319062.2	c.86G>A	p.Cys29Tyr	missense_variant	2/5		NP_001305991.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GUCA1A	ENST00000372958.2	c.86G>A	p.Cys29Tyr	missense_variant	1/4	1	NM_001384910.1	ENSP00000362049	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461290 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727016

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

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

Sep 01, 2022

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). This variant has not been reported in the literature in individuals affected with GUCA1A-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces cysteine, which is neutral and slightly polar, with tyrosine, which is neutral and polar, at codon 29 of the GUCA1A protein (p.Cys29Tyr). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.61	.;.;D;D;D
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.84	.;T;.;.;T
M_CAP	Benign	0.063	D
MetaRNN	Pathogenic	0.94	D;D;D;D;D
MetaSVM	Uncertain	-0.053	T
MutationAssessor	Uncertain	2.7	.;.;M;M;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-9.0	D;.;D;D;D
REVEL	Pathogenic	0.69
Sift	Benign	0.23	T;.;T;T;T
Sift4G	Pathogenic	0.0	D;T;T;T;T
Polyphen		1.0	.;.;D;D;D
Vest4		0.73, 0.80, 0.78, 0.78
MutPred		0.83		Gain of methylation at K24 (P = 0.0589);.;Gain of methylation at K24 (P = 0.0589);Gain of methylation at K24 (P = 0.0589);Gain of methylation at K24 (P = 0.0589);
MVP		0.83
MPC		1.2
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.83
gMVP		0.77

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: rs1400394657; hg19: chr6-42141437;