1-171635936-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PS1_Moderate PM1 PM2 PP3

The NM_000261.2(MYOC):c.1504T>C(p.Ser502Pro) 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 Uncertain significance (★★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYOC NM_000261.2 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:1
• Conservation: PhyloP100: 1.79

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 7 ACMG points.

• PS1: Transcript NM_000261.2 (MYOC) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM1: In a domain Olfactomedin-like (size 259) in uniprot entity MYOC_HUMAN there are 80 pathogenic changes around while only 16 benign (83%) in NM_000261.2
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.786

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYOC	NM_000261.2	c.1504T>C	p.Ser502Pro	missense_variant	3/3	ENST00000037502.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYOC	ENST00000037502.11	c.1504T>C	p.Ser502Pro	missense_variant	3/3	1	NM_000261.2	P1
MYOCOS	ENST00000637303.1	c.235-2694A>G		intron_variant		5		A2
MYOC	ENST00000638471.1	c.*842T>C		3_prime_UTR_variant, NMD_transcript_variant	4/4	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: reviewed by expert panel

Submissions by phenotype

Glaucoma of childhood Uncertain:1

Uncertain significance, reviewed by expert panel

curation

ClinGen Glaucoma Variant Curation Expert Panel

May 09, 2022

The c.1504T>C variant in MYOC is a missense variant predicted to cause substitution of Serine by Proline at amino acid 502 (p.Ser502Pro). 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 = 0.657, which was neither above nor below the thresholds for PP3 (>= 0.7) or BP4 (<= 0.15), predicting a damaging or benign impact on MYOC function. A previous study (PMID: 16466712) demonstrated that the Ser502Pro protein had 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. 6 segregations in 1 family, with juvenile open angle glaucoma (JOAG), have been reported (PMID: 9863594), which fulfilled PP1_Moderate (5-6 meioses). Only 1 proband with JOAG had been reported (PMID: 9863594), not meeting the >= 2 probands threshold required to meet PS4_Supporting. In summary, this variant met the criteria to receive a score of 5 and to be classified as a variant of uncertain significance (uncertain significance classification range -1 to 5) 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, PM2_Supporting. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
Cadd	Benign	23
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.69	D
Eigen	Benign	-0.037
Eigen_PC	Benign	-0.16
FATHMM_MKL	Benign	0.45	N
LIST_S2	Benign	0.54	T
M_CAP	Benign	0.054	D
MetaRNN	Pathogenic	0.79	D
MetaSVM	Uncertain	-0.24	T
MutationAssessor	Uncertain	2.8	M
MutationTaster	Benign	0.99	N
PrimateAI	Benign	0.41	T
PROVEAN	Uncertain	-2.4	N
REVEL	Pathogenic	0.66
Sift	Benign	0.078	T
Sift4G	Benign	0.15	T
Polyphen		0.95	P
Vest4		0.31
MutPred		0.82		Loss of MoRF binding (P = 0.0896);
MVP		0.97
MPC		0.75
ClinPred		0.93	D
GERP RS		0.83
Varity_R		0.77
gMVP		0.94

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-171605076;