17-76531516-C-T

Position:

chr17-76531516-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_134268.5(CYGB):c.319G>A(p.Ala107Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000291 in 1,613,854 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

CYGB
NM_134268.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.21

Variant links:

Genes affected

CYGB (HGNC:16505): (cytoglobin) This gene encodes a globin protein found in vertebrate cells. The encoded protein is described as a hexacoordinate hemoglobin which binds ligand differently from the pentacoordinate hemoglobins involved in oxygen transport, and may be involved in protection during oxidative stress. This gene is located on chromosome 17 in the same region as a retinal gene which is mutated in progressive rod-cone degeneration, but in the opposite orientation. [provided by RefSeq, Jan 2012]

CYGB links:

PRCD (HGNC:32528): (photoreceptor disc component) This gene is predominantly expressed in the retina, and mutations in this gene are the cause of autosomal recessive retinal degeneration in both humans and dogs. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Mar 2010]

PRCD links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.19644716).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
CYGB	NM_134268.5 linkuse as main transcript	c.319G>A	p.Ala107Thr	missense_variant	2/4	ENST00000293230.10	NP_599030.1
CYGB	XM_005257005.4 linkuse as main transcript	c.319G>A	p.Ala107Thr	missense_variant	2/4		XP_005257062.1
CYGB	XM_017024116.2 linkuse as main transcript	c.124G>A	p.Ala42Thr	missense_variant	2/4		XP_016879605.1
PRCD	NR_033357.2 linkuse as main transcript	n.248+3683C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYGB	ENST00000293230.10 linkuse as main transcript	c.319G>A	p.Ala107Thr	missense_variant	2/4	1	NM_134268.5	ENSP00000293230	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152248

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251360

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135868

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000315

AC:

AN:

1461606

Hom.:

Cov.:

AF XY:

0.0000303

AC XY:

AN XY:

727044

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000387

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152248

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74376

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 04, 2023

The c.319G>A (p.A107T) alteration is located in exon 2 (coding exon 2) of the CYGB gene. This alteration results from a G to A substitution at nucleotide position 319, causing the alanine (A) at amino acid position 107 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.097

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.32

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.15

T;.;.;.

Eigen

Benign

-0.56

Eigen_PC

Benign

-0.49

FATHMM_MKL

Benign

0.47

LIST_S2

Uncertain

0.87

D;D;.;D

M_CAP

Benign

0.040

MetaRNN

Benign

0.20

T;T;T;T

MetaSVM

Uncertain

-0.23

MutationAssessor

Benign

1.4

L;.;.;.

MutationTaster

Benign

1.0

N;N;N;N

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-0.56

N;.;.;.

REVEL

Benign

0.19

Sift

Benign

0.21

T;.;.;.

Sift4G

Benign

0.47

T;T;T;T

Polyphen

0.035

B;.;.;.

Vest4

0.26

MutPred

0.50

Loss of stability (P = 0.0763);Loss of stability (P = 0.0763);.;.;

MVP

0.85

MPC

0.65

ClinPred

0.14

GERP RS

2.4

Varity_R

0.15

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over