1-171636000-G-T

Position:

• chr1-171636000-G-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PS3_Moderate PM2_Supporting PS4_Moderate PP1_Strong PP3

This summary comes from the ClinGen Evidence Repository: The c.1440C>A variant in MYOC is a missense variant predicted to cause substitution of Asparagine by Lysine at amino acid 480 (p.Asn480Lys). This variant was not found in any population of gnomAD (v2.1.1), meeting the ≤ 0.0001 threshold set for PM2_Supporting in a population of at least 10,000 alleles. The REVEL score = 0.784, which met the ≥ 0.7 threshold for PP3, predicting a damaging effect on MYOC function. Previous studies (PMIDs: 16466712 and 35196929) demonstrated that the Asn480Lys protein had increased insolubility and reduced secretion levels compared to wild type myocilin protein and met the OddsPath threshold for PS3_Moderate (> 4.3), indicating that this variant did impact protein function. Over 90 segregations in 8 families, with juvenile or primary open angle glaucoma (JOAG or POAG), have been reported (PMIDs: 12107514, 24883016, 9556305), which fulfilled PP1_Strong (≥ 7 meioses in > 1 family). 13 probands with JOAG or POAG have been reported carrying this variant (PMIDs: pers. communication E Souzeau, 22194650, 12872267, 12107514, 24883016, 9556305), which met PS4_Moderate (≥ 6 probands). In summary, this variant met the criteria to receive a score of 10 and to be classified as pathogenic (pathogenic classification ≥ 10) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PP1_Strong, PS3_Moderate, PS4_Moderate, PP3, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA119175/MONDO:0020367/019

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: MYOC NM_000261.2 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 2.53

Genes affected

MYOC (HGNC:7610): (myocilin) MYOC encodes the protein myocilin, which is believed to have a role in cytoskeletal function. MYOC is expressed in many occular tissues, including the trabecular meshwork, and was revealed to be the trabecular meshwork glucocorticoid-inducible response protein (TIGR). The trabecular meshwork is a specialized eye tissue essential in regulating intraocular pressure, and mutations in MYOC have been identified as the cause of hereditary juvenile-onset open-angle glaucoma. [provided by RefSeq, Jul 2008]

MYOCOS (HGNC:53429): (myocilin opposite strand)

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYOC	NM_000261.2	c.1440C>A	p.Asn480Lys	missense_variant	3/3	ENST00000037502.11	NP_000252.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYOC	ENST00000037502.11	c.1440C>A	p.Asn480Lys	missense_variant	3/3	1	NM_000261.2	ENSP00000037502.5
MYOCOS	ENST00000637303.1	c.235-2630G>T		intron_variant		5		ENSP00000490048.1
MYOC	ENST00000638471.1	n.*778C>A		non_coding_transcript_exon_variant	4/4	5		ENSP00000491206.1
MYOC	ENST00000638471.1	n.*778C>A		3_prime_UTR_variant	4/4	5		ENSP00000491206.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461882 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727238

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

Glaucoma 1, open angle, A Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 13, 1998

- -

Glaucoma of childhood Pathogenic:1

Pathogenic, reviewed by expert panel

curation

ClinGen Glaucoma Variant Curation Expert Panel

May 09, 2022

The c.1440C>A variant in MYOC is a missense variant predicted to cause substitution of Asparagine by Lysine at amino acid 480 (p.Asn480Lys). This variant was not found in any population of gnomAD (v2.1.1), meeting the <= 0.0001 threshold set for PM2_Supporting in a population of at least 10,000 alleles. The REVEL score = 0.784, which met the >= 0.7 threshold for PP3, predicting a damaging effect on MYOC function. Previous studies (PMIDs: 16466712 and 35196929) demonstrated that the Asn480Lys protein had increased insolubility and reduced secretion levels compared to wild type myocilin protein and met the OddsPath threshold for PS3_Moderate (> 4.3), indicating that this variant did impact protein function. Over 90 segregations in 8 families, with juvenile or primary open angle glaucoma (JOAG or POAG), have been reported (PMIDs: 12107514, 24883016, 9556305), which fulfilled PP1_Strong (>= 7 meioses in > 1 family). 13 probands with JOAG or POAG have been reported carrying this variant (PMIDs: pers. communication E Souzeau, 22194650, 12872267, 12107514, 24883016, 9556305), which met PS4_Moderate (>= 6 probands). In summary, this variant met the criteria to receive a score of 10 and to be classified as pathogenic (pathogenic classification >= 10) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PP1_Strong, PS3_Moderate, PS4_Moderate, PP3, PM2_Supporting. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D
Eigen	Uncertain	0.34
Eigen_PC	Benign	0.19
FATHMM_MKL	Benign	0.55	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.18	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.74	D
MutationAssessor	Pathogenic	4.0	H
PrimateAI	Uncertain	0.53	T
PROVEAN	Pathogenic	-5.5	D
REVEL	Pathogenic	0.78
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0050	D
Polyphen		1.0	D
Vest4		0.87
MutPred		0.98		Gain of methylation at N480 (P = 0.0071);
MVP		0.98
MPC		0.77
ClinPred		1.0	D
GERP RS		0.23
Varity_R		0.98
gMVP		0.96

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

Other links and lift over

dbSNP: rs74315332; hg19: chr1-171605140;