NM_020989.4:c.155A>G

Variant names:

• chr2-208129538-T-C
• rs1553585708
• NM_020989.4:c.155A>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020989.4(CRYGC):​c.155A>G​(p.Gln52Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 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. Q52P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CRYGC NM_020989.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0990
• Publications: 0 publications found

Genes affected

CRYGC (HGNC:2410): (crystallin gamma C) This gene encodes a member of the beta/gamma-crystallin family of proteins. Crystallins constitute the major proteins of vertebrate eye lens and maintain the transparency and refractive index of the lens. This gene and several family members are present in a gene cluster on chromosome 2. Mutations in this gene have been shown to cause multiple types of cataract, including Coppock-like cataract and zonular pulverulent cataract, among others. [provided by RefSeq, Jan 2015]

CRYGC Gene-Disease associations (from GenCC):

• cataract 2, multiple types

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• cataract - microcornea syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset lamellar cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset nuclear cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• pulverulent cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000295187 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14878401).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020989.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRYGC	NM_020989.4	MANE Select	c.155A>G	p.Gln52Arg	missense	Exon 2 of 3	NP_066269.1
	LOC100507443	NR_038437.1		n.98-7518T>C		intron	N/A

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRYGC	ENST00000282141.4	TSL:1 MANE Select	c.155A>G	p.Gln52Arg	missense	Exon 2 of 3	ENSP00000282141.3
	ENSG00000295187	ENST00000728538.1		n.101-7518T>C		intron	N/A
	ENSG00000295187	ENST00000728539.1		n.118-7518T>C		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	13
DANN	Benign	0.68
DEOGEN2	Benign	0.18	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.23	N
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	-0.26	N
PhyloP100		-0.099
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-0.37	N
REVEL	Benign	0.11
Sift	Benign	0.71	T
Sift4G	Benign	0.73	T
Polyphen		0.0040	B
Vest4		0.24
MutPred		0.40		Gain of MoRF binding (P = 0.0442)
MVP		0.51
MPC		0.11
ClinPred		0.052	T
GERP RS		-4.8
PromoterAI		-0.0070	Neutral
Varity_R		0.15
gMVP		0.34
Mutation Taster		=85/15	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: rs1553585708; hg19: chr2-208994262;