12-91051468-G-C

Variant names:

• chr12-91051468-G-C
• rs121917863
• NM_007035.4:c.937C>G

Variant summary

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

The NM_007035.4(KERA):​c.937C>G​(p.Arg313Gly) 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. R313Q) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KERA NM_007035.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.40
• Publications: 6 publications found

Genes affected

KERA (HGNC:6309): (keratocan) The protein encoded by this gene is a keratan sulfate proteoglycan that is involved in corneal transparency. Defects in this gene are a cause of autosomal recessive cornea plana 2 (CNA2).[provided by RefSeq, May 2010]

KERA Gene-Disease associations (from GenCC):

• cornea plana

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• cornea plana 2

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• congenital cornea plana

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

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=0.10708696).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007035.4. 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
	KERA	NM_007035.4	MANE Select	c.937C>G	p.Arg313Gly	missense	Exon 3 of 3	NP_008966.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KERA	ENST00000266719.4	TSL:1 MANE Select	c.937C>G	p.Arg313Gly	missense	Exon 3 of 3	ENSP00000266719.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250408 AF XY: 0.00000739

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000883

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.54
CADD	Benign	14
DANN	Benign	0.87
DEOGEN2	Benign	0.32	T
Eigen	Benign	-0.95
Eigen_PC	Benign	-0.89
FATHMM_MKL	Benign	0.097	N
LIST_S2	Benign	0.53	T
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
PhyloP100		2.4
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.50	N
REVEL	Benign	0.12
Sift	Benign	0.33	T
Sift4G	Benign	0.33	T
Polyphen		0.0010	B
Vest4		0.16
MutPred		0.43		Gain of catalytic residue at Y318 (P = 0.0011)
MVP		0.49
MPC		0.016
ClinPred		0.057	T
GERP RS		4.6
Varity_R		0.077
gMVP		0.20
Mutation Taster		=94/6	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: rs121917863; hg19: chr12-91445245;