21-43170619-G-A

Variant names:

• chr21-43170619-G-A
• rs398122947
• NM_000394.4:c.292G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PP2 PP3_Strong PP5_Moderate

The NM_000394.4(CRYAA):​c.292G>A​(p.Gly98Arg) variant causes a missense change involving the alteration of a conserved nucleotide. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 0)
• Consequence: CRYAA NM_000394.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.21
• Publications: 28 publications found

Genes affected

CRYAA (HGNC:2388): (crystallin alpha A) Mammalian lens crystallins are divided into alpha, beta, and gamma families. Alpha crystallins are composed of two gene products: alpha-A and alpha-B, for acidic and basic, respectively. Alpha crystallins can be induced by heat shock and are members of the small heat shock protein (HSP20) family. They act as molecular chaperones although they do not renature proteins and release them in the fashion of a true chaperone; instead they hold them in large soluble aggregates. Post-translational modifications decrease the ability to chaperone. These heterogeneous aggregates consist of 30-40 subunits; the alpha-A and alpha-B subunits have a 3:1 ratio, respectively. Two additional functions of alpha crystallins are an autokinase activity and participation in the intracellular architecture. The encoded protein has been identified as a moonlighting protein based on its ability to perform mechanistically distinct functions. Alpha-A and alpha-B gene products are differentially expressed; alpha-A is preferentially restricted to the lens and alpha-B is expressed widely in many tissues and organs. Defects in this gene cause autosomal dominant congenital cataract (ADCC). [provided by RefSeq, Jan 2014]

CRYAA Gene-Disease associations (from GenCC):

• cataract 9 multiple types

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset anterior polar 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
• total early-onset cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

LOC107987300 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a chain Alpha-crystallin A(1-162) (size 161) in uniprot entity CRYAA_HUMAN there are 12 pathogenic changes around while only 1 benign (92%) in NM_000394.4
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 11 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 0.34778 (below the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to early-onset lamellar cataract, cataract - microcornea syndrome, early-onset nuclear cataract, early-onset anterior polar cataract, total early-onset cataract, cataract 9 multiple types.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991
• PP5: Variant 21-43170619-G-A is Pathogenic according to our data. Variant chr21-43170619-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 68456.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CRYAA	NM_000394.4	c.292G>A	p.Gly98Arg	missense_variant	Exon 2 of 3	ENST00000291554.6	NP_000385.1
CRYAA	NM_001363766.1	c.181G>A	p.Gly61Arg	missense_variant	Exon 2 of 3		NP_001350695.1
LOC107987300	XR_007067885.1	n.546+418C>T		intron_variant	Intron 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CRYAA	ENST00000291554.6	c.292G>A	p.Gly98Arg	missense_variant	Exon 2 of 3	1	NM_000394.4	ENSP00000291554.2

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 0

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Cataract 9 multiple types Pathogenic:2

Jul 12, 2006

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Aug 13, 2021

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.96	D;.;.
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Pathogenic	0.74	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.1	H;.;.
PhyloP100		7.2
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.8	D;D;D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;.;.
Vest4		0.86
MutPred		0.94		Loss of ubiquitination at K99 (P = 0.0716);.;.;
MVP		0.97
MPC		1.3
ClinPred		1.0	D
GERP RS		3.9
PromoterAI		-0.0052	Neutral
Varity_R		0.60
gMVP		0.96
Mutation Taster		=5/95	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: rs398122947; hg19: chr21-44590729; COSMIC: COSV52352114;