X-136206437-C-T

Position:

chrX-136206437-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4BS1_SupportingBS2

The NM_001159702.3(FHL1):c.5C>T(p.Ala2Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000024 in 1,210,710 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 8 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. A2A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000044 ( 0 hom., 0 hem., cov: 24)

Exomes 𝑓: 0.000022 ( 0 hom. 8 hem. )

Consequence

FHL1
NM_001159702.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 7.90

Variant links:

Genes affected

FHL1 (HGNC:3702): (four and a half LIM domains 1) This gene encodes a member of the four-and-a-half-LIM-only protein family. Family members contain two highly conserved, tandemly arranged, zinc finger domains with four highly conserved cysteines binding a zinc atom in each zinc finger. Expression of these family members occurs in a cell- and tissue-specific mode and these proteins are involved in many cellular processes. Mutations in this gene have been found in patients with Emery-Dreifuss muscular dystrophy. Multiple alternately spliced transcript variants which encode different protein isoforms have been described.[provided by RefSeq, Nov 2009]

FHL1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.33708543).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0000445 (5/112482) while in subpopulation NFE AF= 0.0000939 (5/53225). AF 95% confidence interval is 0.0000369. There are 0 homozygotes in gnomad4. There are 0 alleles in male gnomad4 subpopulation. Median coverage is 24. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Hemizygotes in GnomAdExome4 at 8 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FHL1	NM_001159702.3 linkuse as main transcript	c.5C>T	p.Ala2Val	missense_variant	3/8	ENST00000394155.8
FHL1	NM_001159699.2 linkuse as main transcript	c.53C>T	p.Ala18Val	missense_variant	2/6	ENST00000370683.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FHL1	ENST00000394155.8 linkuse as main transcript	c.5C>T	p.Ala2Val	missense_variant	3/8	5	NM_001159702.3		Q13642-2
FHL1	ENST00000370683.6 linkuse as main transcript	c.53C>T	p.Ala18Val	missense_variant	2/6	1	NM_001159699.2	P1	Q13642-5

Frequencies

GnomAD3 genomes

AF:

0.0000445

AC:

AN:

112482

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34640

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000939

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000327

AC:

AN:

183451

Hom.:

AF XY:

0.00

AC XY:

AN XY:

67887

show subpopulations

Gnomad AFR exome

AF:

0.0000760

Gnomad AMR exome

AF:

0.0000365

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000625

Gnomad NFE exome

AF:

0.0000366

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000219

AC:

AN:

1098228

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

363582

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000284

Gnomad4 ASJ exome

AF:

0.0000516

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000493

Gnomad4 NFE exome

AF:

0.0000237

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000445

AC:

AN:

112482

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34640

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000939

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000831

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.000261

AC:

ESP6500EA

AF:

0.000297

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 02, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 04, 2021	Has not been previously published as pathogenic or benign to our knowledge -

X-linked myopathy with postural muscle atrophy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 01, 2024

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 2 of the FHL1 protein (p.Ala2Val). This variant is present in population databases (rs146125558, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with FHL1-related conditions. ClinVar contains an entry for this variant (Variation ID: 289087). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 02, 2021

The p.A2V variant (also known as c.5C>T), located in coding exon 1 of the FHL1 gene, results from a C to T substitution at nucleotide position 5. The alanine at codon 2 is replaced by valine, an amino acid with similar properties. Based on data from gnomAD, the T allele has an overall frequency of <0.01% (6/183451) total alleles studied, with 0 hemizygote(s) observed. The highest observed frequency was <0.01% (1/13161) of African alleles. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.43

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.27

.;T;.;T;.;T;T;T;.;.;T;T;T;.;T;T;.;.;T;.;T;T;.;.;.;T;T;.

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.95

.;D;.;D;D;D;D;D;D;.;D;.;.;.;D;D;.;D;D;D;D;.;.;D;D;D;D;.

M_CAP

Pathogenic

0.44

MetaRNN

Benign

0.34

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.55

MutationAssessor

Benign

1.9

L;L;L;.;L;.;.;.;.;L;.;.;.;L;.;.;L;L;.;.;.;L;.;.;.;.;.;L

MutationTaster

Benign

0.90

D;D;D;D;D;D;D;D;D

PrimateAI

Benign

0.47

PROVEAN

Benign

-1.9

.;N;N;.;.;N;N;.;.;.;.;N;.;N;.;N;N;N;N;.;N;N;.;N;N;N;N;.

REVEL

Benign

0.15

Sift

Benign

0.072

.;T;D;.;.;D;D;.;.;.;.;D;.;D;.;D;D;D;D;.;D;T;.;D;D;D;D;.

Sift4G

Uncertain

0.0080

D;D;D;D;D;D;D;D;D;D;D;D;.;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D

Polyphen

0.82, 0.37

.;P;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;P;.;.;.;B;.;.

Vest4

0.14

MVP

0.73

MPC

0.50

ClinPred

0.30

GERP RS

5.7

Varity_R

0.18

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over