4-78057753-G-T

Position:

• chr4-78057753-G-T

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_025074.7(FRAS1):​c.-257G>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00523 in 544,834 control chromosomes in the GnomAD database, including 63 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.014 (49 hom., cov: 32)
  • Exomes 𝑓: 0.0019 (14 hom.)
• Consequence: FRAS1 NM_025074.7 5_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.222

Genes affected

FRAS1 (HGNC:19185): (Fraser extracellular matrix complex subunit 1) This gene encodes an extracellular matrix protein that appears to function in the regulation of epidermal-basement membrane adhesion and organogenesis during development. Mutations in this gene cause Fraser syndrome, a multisystem malformation that can include craniofacial, urogenital and respiratory system abnormalities. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP6: Variant 4-78057753-G-T is Benign according to our data. Variant chr4-78057753-G-T is described in ClinVar as [Benign]. Clinvar id is 349644.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0137 (2088/152314) while in subpopulation AFR AF= 0.0476 (1981/41576). AF 95% confidence interval is 0.0459. There are 49 homozygotes in gnomad4. There are 1021 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 49 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FRAS1	NM_025074.7	c.-257G>T		5_prime_UTR_variant	1/74	ENST00000512123.4
FRAS1	NM_001166133.2	c.-257G>T		5_prime_UTR_variant	1/42

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FRAS1	ENST00000512123.4	c.-257G>T		5_prime_UTR_variant	1/74	5	NM_025074.7	P1

Frequencies

GnomAD3 genomes AF: 0.0137 AC: 2088 AN: 152196 Hom.: 49 Cov.: 32

Gnomad AFR AF: 0.0478

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00543

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00718

GnomAD4 exome AF: 0.00194 AC: 763 AN: 392520 Hom.: 14 Cov.: 0 AF XY: 0.00164 AC XY: 333 AN XY: 202908

Gnomad4 AFR exome AF: 0.0506

Gnomad4 AMR exome AF: 0.00279

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000586

Gnomad4 SAS exome AF: 0.0000967

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000117

Gnomad4 OTH exome AF: 0.00372

GnomAD4 genome AF: 0.0137 AC: 2088 AN: 152314 Hom.: 49 Cov.: 32 AF XY: 0.0137 AC XY: 1021 AN XY: 74486

Gnomad4 AFR AF: 0.0476

Gnomad4 AMR AF: 0.00536

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000194

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00710

Alfa AF: 0.00232 Hom.: 1

Bravo AF: 0.0157

Asia WGS AF: 0.00231 AC: 8 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fraser syndrome 1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	8.8
DANN	Benign	0.95

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: rs78363185; hg19: chr4-78978907;