1-171636302-C-G

Position:

• chr1-171636302-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PS3_Moderate PM2_Supporting PP1_Moderate PP3

This summary comes from the ClinGen Evidence Repository: The c.1138G>C variant in MYOC is a missense variant predicted to cause substitution of Aspartic acid by Histidine at amino acid 380 (p.Asp380His). 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 = 0.965, which met the ≥ 0.7 threshold for PP3, predicting a damaging effect on MYOC function. A previous study (PMID:35196929) demonstrated that the Asp380His 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. 9 segregations in 1 family, with juvenile or primary open angle glaucoma (JOAG or POAG), have been reported (PMID:17499207), which fulfilled PP1_Moderate (≥ 5 meioses in ≥ 1 family, but not the ≥ 7 meioses in > 1 family for the strong criterion). Only 1 proband with JOAG had been reported (PMID:17499207), not meeting the ≥ 2 probands threshold required to meet PS4_Supporting. In summary, this variant met the criteria to receive a score of 6 and to be classified as likely pathogenic (likely pathogenic classification range 6 to 9) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PS3_Moderate, PP1_Moderate, PP3, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA119186/MONDO:0020367/019

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYOC NM_000261.2 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 7.86

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 Likely_pathogenic. Variant got 6 ACMG points.

• PS3: 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.1138G>C	p.Asp380His	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.1138G>C	p.Asp380His	missense_variant	3/3	1	NM_000261.2	ENSP00000037502.5
MYOCOS	ENST00000637303.1	c.235-2328C>G		intron_variant		5		ENSP00000490048.1
MYOC	ENST00000638471.1	n.*476G>C		non_coding_transcript_exon_variant	4/4	5		ENSP00000491206.1
MYOC	ENST00000638471.1	n.*476G>C		3_prime_UTR_variant	4/4	5		ENSP00000491206.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely 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

Jul 01, 2007

- -

Glaucoma of childhood Pathogenic:1

Likely pathogenic, reviewed by expert panel

curation

ClinGen Glaucoma Variant Curation Expert Panel

Mar 05, 2022

The c.1138G>C variant in MYOC is a missense variant predicted to cause substitution of Aspartic acid by Histidine at amino acid 380 (p.Asp380His). 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 = 0.965, which met the >= 0.7 threshold for PP3, predicting a damaging effect on MYOC function. A previous study (PMID: 35196929) demonstrated that the Asp380His 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. 9 segregations in 1 family, with juvenile or primary open angle glaucoma (JOAG or POAG), have been reported (PMID: 17499207), which fulfilled PP1_Moderate (>= 5 meioses in >= 1 family, but not the >= 7 meioses in > 1 family for the strong criterion). Only 1 proband with JOAG had been reported (PMID: 17499207), not meeting the >= 2 probands threshold required to meet PS4_Supporting. In summary, this variant met the criteria to receive a score of 6 and to be classified as likely pathogenic (likely pathogenic classification range 6 to 9) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PS3_Moderate, PP1_Moderate, PP3, PM2_Supporting. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	29
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.99	D
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.93	D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.2	H
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-7.0	D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.99		Loss of stability (P = 0.0965);
MVP		0.99
MPC		0.78
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.94
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: rs121909194; hg19: chr1-171605442;