4-78537166-C-T

Position:

• chr4-78537166-C-T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The NM_025074.7(FRAS1):​c.11264C>T​(p.Pro3755Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00144 in 1,613,940 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0013 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0015 (2 hom.)
• Consequence: FRAS1 NM_025074.7 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:1
• Conservation: PhyloP100: 7.77

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 -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.054219812).
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00125 (191/152334) while in subpopulation NFE AF= 0.00201 (137/68036). AF 95% confidence interval is 0.00174. There are 1 homozygotes in gnomad4. There are 84 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FRAS1	NM_025074.7	c.11264C>T	p.Pro3755Leu	missense_variant	72/74	ENST00000512123.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FRAS1	ENST00000512123.4	c.11264C>T	p.Pro3755Leu	missense_variant	72/74	5	NM_025074.7	P1

Frequencies

GnomAD3 genomes AF: 0.00125 AC: 191 AN: 152216 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.000627

Gnomad AMI AF: 0.0143

Gnomad AMR AF: 0.000523

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000377

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00201

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000924 AC: 230 AN: 249018 Hom.: 0 AF XY: 0.000918 AC XY: 124 AN XY: 135118

Gnomad AFR exome AF: 0.000581

Gnomad AMR exome AF: 0.000464

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.000232

Gnomad NFE exome AF: 0.00172

Gnomad OTH exome AF: 0.000829

GnomAD4 exome AF: 0.00146 AC: 2132 AN: 1461606 Hom.: 2 Cov.: 31 AF XY: 0.00149 AC XY: 1082 AN XY: 727078

Gnomad4 AFR exome AF: 0.000358

Gnomad4 AMR exome AF: 0.000514

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.000543

Gnomad4 NFE exome AF: 0.00181

Gnomad4 OTH exome AF: 0.000828

GnomAD4 genome AF: 0.00125 AC: 191 AN: 152334 Hom.: 1 Cov.: 32 AF XY: 0.00113 AC XY: 84 AN XY: 74492

Gnomad4 AFR AF: 0.000625

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000377

Gnomad4 NFE AF: 0.00201

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00163 Hom.: 2

Bravo AF: 0.00116

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.00130 AC: 5

ESP6500AA AF: 0.000530 AC: 2

ESP6500EA AF: 0.00170 AC: 14

ExAC AF: 0.000943 AC: 114

EpiCase AF: 0.00240

EpiControl AF: 0.00136

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Fraser syndrome 1 Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Uncertain significance, no assertion criteria provided	clinical testing	Service de Biochimie Médicale et Biologie Moléculaire, CHU Clermont-Ferrand	Sep 14, 2018	- -
Uncertain significance, 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, 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. -

not provided Uncertain:2 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 31, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	May 26, 2016	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 14, 2023	Has not been previously published as pathogenic or benign in association with FRAS1-related Fraser syndrome to our knowledge; In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 36282544) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	26
DANN	Uncertain	1.0
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.094	D
MetaRNN	Benign	0.054	T
MetaSVM	Uncertain	0.037	D
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.83	D
Sift4G	Uncertain	0.0030	D
Vest4		0.82
MVP		0.57
ClinPred		0.098	T
GERP RS		5.9
gMVP		0.56

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs199510509; hg19: chr4-79458320;