20-6075288-C-T

Variant names:

• chr20-6075288-C-T
• rs146142837
• ENST00000478194.1:n.2879G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Strong BS1_Supporting

The ENST00000478194.1(FERMT1):​n.2879G>A variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00144 in 152,040 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0014 (1 hom., cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: FERMT1 ENST00000478194.1 non_coding_transcript_exon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.675
• Publications: 0 publications found

Genes affected

FERMT1 (HGNC:15889): (FERM domain containing kindlin 1) This gene encodes a member of the fermitin family, and contains a FERM domain and a pleckstrin homology domain. The encoded protein is involved in integrin signaling and linkage of the actin cytoskeleton to the extracellular matrix. Mutations in this gene have been linked to Kindler syndrome. [provided by RefSeq, Dec 2009]

FERMT1 Gene-Disease associations (from GenCC):

• Kindler syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, PanelApp Australia

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00144 (219/152040) while in subpopulation AFR AF = 0.00497 (206/41472). AF 95% confidence interval is 0.00441. There are 1 homozygotes in GnomAd4. There are 95 alleles in the male GnomAd4 subpopulation. Median coverage is 31. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FERMT1	NM_017671.5	c.*1885G>A		3_prime_UTR_variant	Exon 15 of 15	ENST00000217289.9	NP_060141.3
FERMT1	XM_024451935.2	c.*1885G>A		3_prime_UTR_variant	Exon 15 of 15		XP_024307703.1
FERMT1	XM_047440259.1	c.*1885G>A		3_prime_UTR_variant	Exon 15 of 15		XP_047296215.1
FERMT1	XM_047440260.1	c.*1885G>A		3_prime_UTR_variant	Exon 14 of 14		XP_047296216.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FERMT1	ENST00000478194.1	n.2879G>A		non_coding_transcript_exon_variant	Exon 7 of 7	1
FERMT1	ENST00000217289.9	c.*1885G>A		3_prime_UTR_variant	Exon 15 of 15	1	NM_017671.5	ENSP00000217289.4
FERMT1	ENST00000699095.1	c.*1885G>A		downstream_gene_variant				ENSP00000514127.1

Frequencies

GnomAD3 genomes AF: 0.00144 AC: 219 AN: 151922 Hom.: 1 Cov.: 31

Gnomad AFR AF: 0.00498

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000525

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000208

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00191

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 138 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 76

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AF: 0.00 AC: 0 AN: 138

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AC: 0 AN: 0

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AC: 0 AN: 0

Other (OTH) AC: 0 AN: 0

GnomAD4 genome AF: 0.00144 AC: 219 AN: 152040 Hom.: 1 Cov.: 31 AF XY: 0.00128 AC XY: 95 AN XY: 74322

African (AFR) AF: 0.00497 AC: 206 AN: 41472

American (AMR) AF: 0.000524 AC: 8 AN: 15266

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3462

East Asian (EAS) AF: 0.00 AC: 0 AN: 5174

South Asian (SAS) AF: 0.000208 AC: 1 AN: 4810

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10552

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67982

Other (OTH) AF: 0.00189 AC: 4 AN: 2116

Alfa AF: 0.00149 Hom.: 0

Bravo AF: 0.00172

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Kindler syndrome Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	1.4
DANN	Benign	0.57
PhyloP100		-0.68

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: rs146142837; hg19: chr20-6055935;