8-101644221-G-GC

Variant names:

• chr8-101644221-G-GC
• rs398122997
• NM_024915.4:c.1609dupC

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_024915.4(GRHL2):​c.1609dupC​(p.Arg537ProfsTer11) variant causes a frameshift, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. R537R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GRHL2 NM_024915.4 frameshift, splice_region
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.89
• Publications: 10 publications found

Genes affected

GRHL2 (HGNC:2799): (grainyhead like transcription factor 2) The protein encoded by this gene is a transcription factor that can act as a homodimer or as a heterodimer with either GRHL1 or GRHL3. Defects in this gene are a cause of non-syndromic sensorineural deafness autosomal dominant type 28 (DFNA28).[provided by RefSeq, Mar 2009]

GRHL2 Gene-Disease associations (from GenCC):

• autosomal dominant nonsyndromic hearing loss 28

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
• nonsyndromic genetic hearing loss

  Inheritance: AD Classification: STRONG Submitted by: ClinGen
• posterior polymorphous corneal dystrophy

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, G2P
• nail and teeth abnormalities-marginal palmoplantar keratoderma-oral hyperpigmentation syndrome

  Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital fibrosis of extraocular muscles

  Inheritance: Unknown Classification: LIMITED Submitted by: Genomics England PanelApp

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-101644221-G-GC is Pathogenic according to our data. Variant chr8-101644221-G-GC is described in ClinVar as Pathogenic. ClinVar VariationId is 2195.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GRHL2	NM_024915.4	c.1609dupC	p.Arg537ProfsTer11	frameshift_variant, splice_region_variant	Exon 13 of 16	ENST00000646743.1	NP_079191.2
GRHL2	NM_001330593.2	c.1561dupC	p.Arg521ProfsTer11	frameshift_variant, splice_region_variant	Exon 13 of 16		NP_001317522.1
GRHL2	NM_001440448.1	c.1561dupC	p.Arg521ProfsTer11	frameshift_variant, splice_region_variant	Exon 13 of 16		NP_001427377.1
GRHL2	NM_001440447.1	c.1609dupC	p.Arg537ProfsTer11	frameshift_variant, splice_region_variant	Exon 13 of 16		NP_001427376.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GRHL2	ENST00000646743.1	c.1609dupC	p.Arg537ProfsTer11	frameshift_variant, splice_region_variant	Exon 13 of 16		NM_024915.4	ENSP00000495564.1
GRHL2	ENST00000395927.1	c.1561dupC	p.Arg521ProfsTer11	frameshift_variant, splice_region_variant	Exon 13 of 16	2		ENSP00000379260.1
GRHL2	ENST00000474338.1	n.251dupC		splice_region_variant, non_coding_transcript_exon_variant	Exon 2 of 4	3
GRHL2	ENST00000517674.5	n.264dupC		splice_region_variant, non_coding_transcript_exon_variant	Exon 3 of 4	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Autosomal dominant nonsyndromic hearing loss 28 Pathogenic:1

Nov 01, 2002

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.9
Mutation Taster		=2/198	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: rs398122997; hg19: chr8-102656449;