chr7-193361-G-GCCGAA

Variant names:

• chr7-193361-G-GCCGAA
• NM_020223.4:c.162_163insCCGAA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_020223.4(FAM20C):​c.162_163insCCGAA​(p.Val55ProfsTer77) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FAM20C NM_020223.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.88

Genes affected

FAM20C (HGNC:22140): (FAM20C golgi associated secretory pathway kinase) This gene encodes a member of the family of secreted protein kinases. The encoded protein binds calcium and phosphorylates proteins involved in bone mineralization. Mutations in this gene are associated with the autosomal recessive disorder Raine syndrome. [provided by RefSeq, Apr 2014]

ENSG00000240093 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 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 7-193361-G-GCCGAA is Pathogenic according to our data. Variant chr7-193361-G-GCCGAA is described in ClinVar as [Pathogenic]. Clinvar id is 2050437.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAM20C	NM_020223.4	c.162_163insCCGAA	p.Val55ProfsTer77	frameshift_variant	Exon 1 of 10	ENST00000313766.6	NP_064608.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FAM20C	ENST00000313766.6	c.162_163insCCGAA	p.Val55ProfsTer77	frameshift_variant	Exon 1 of 10	1	NM_020223.4	ENSP00000322323.5
ENSG00000240093	ENST00000467050.1	n.233+586_233+587insTTCGG		intron_variant	Intron 1 of 2	4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Dec 20, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Val55Profs*77) in the FAM20C gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in FAM20C are known to be pathogenic (PMID: 17924334, 22615579, 22732358, 23325605, 25026495). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FAM20C-related conditions. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

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: chr7-193361;