NM_006891.4:c.109C>A

Variant names:

• chr2-208124255-G-T
• rs121909597
• NM_006891.4:c.109C>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM2 PM5 PP3_Strong PP5_Moderate

The NM_006891.4(CRYGD):​c.109C>A​(p.Arg37Ser) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R37P) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CRYGD NM_006891.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 1.69
• Publications: 18 publications found

Genes affected

CRYGD (HGNC:2411): (crystallin gamma D) Crystallins are separated into two classes: taxon-specific, or enzyme, and ubiquitous. The latter class constitutes the major proteins of vertebrate eye lens and maintains the transparency and refractive index of the lens. Since lens central fiber cells lose their nuclei during development, these crystallins are made and then retained throughout life, making them extremely stable proteins. Mammalian lens crystallins are divided into alpha, beta, and gamma families; beta and gamma crystallins are also considered as a superfamily. Alpha and beta families are further divided into acidic and basic groups. Seven protein regions exist in crystallins: four homologous motifs, a connecting peptide, and N- and C-terminal extensions. Gamma-crystallins are a homogeneous group of highly symmetrical, monomeric proteins typically lacking connecting peptides and terminal extensions. They are differentially regulated after early development. Four gamma-crystallin genes (gamma-A through gamma-D) and three pseudogenes (gamma-E, gamma-F, gamma-G) are tandemly organized in a genomic segment as a gene cluster. Whether due to aging or mutations in specific genes, gamma-crystallins have been involved in cataract formation. [provided by RefSeq, Jul 2008]

CRYGD Gene-Disease associations (from GenCC):

• cataract 4 multiple types

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

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

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

  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: Pathogenic. The variant received 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-208124254-C-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2580739.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983
• PP5: Variant 2-208124255-G-T is Pathogenic according to our data. Variant chr2-208124255-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 16939.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006891.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRYGD	NM_006891.4	MANE Select	c.109C>A	p.Arg37Ser	missense	Exon 2 of 3	NP_008822.2
	LOC100507443	NR_038437.1		n.97+5030G>T		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRYGD	ENST00000264376.5	TSL:1 MANE Select	c.109C>A	p.Arg37Ser	missense	Exon 2 of 3	ENSP00000264376.4	P07320
	ENSG00000295187	ENST00000728538.1		n.100+5030G>T		intron	N/A
	ENSG00000295187	ENST00000728539.1		n.117+5030G>T		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000896 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Aculeiform cataract (1)
1	-	-	Cataract 4 multiple types (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.73
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.29
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Benign	0.27	N
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	0.69	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		1.7
PrimateAI	Uncertain	0.54	T
PROVEAN	Pathogenic	-5.4	D
REVEL	Pathogenic	0.78
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0040	D
Polyphen		0.99	D
Vest4		0.94
MutPred		0.89		Loss of stability (P = 0.0838)
MVP		0.88
MPC		0.56
ClinPred		0.99	D
GERP RS		3.4
PromoterAI		0.040	Neutral
Varity_R		0.97
gMVP		0.81
Mutation Taster		=22/78	disease causing (ClinVar)

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: rs121909597; hg19: chr2-208988979;