FHL1 : c.221C>G

Variant Details

Variant (CDS)	Variant (protein)	Variant Type	Variant Effect	Genomic Location (GRCh37)	ExAC Frequency
c.221C>G	p.P74R (Pro > Arg)	substitution	missense	chrX:135289239 (forward strand)	0.000000

Effect in Cardiac Disease

This variant is considered a rare variant and is not detected in the ExAC population database (>60,000 samples).

HCM	Rare FHL1 Non-Truncating* variants are significantly enriched in HCM (details) and have an etiological fraction (EF) of 0.86.* OMGL: Detected in 1 / 1535 HCM patients - classified as Class 3-Unknown pathogenicity.
DCM	There is no significant excess of rare FHL1 Non-Truncating variants in DCM (details). OMGL: Detected in 0 / 355 DCM patients.

HCM

Rare FHL1 Non-Truncating variants are significantly enriched in HCM (details) and have an etiological fraction (EF) of 0.86.

OMGL: Detected in 1 / 1535 HCM patients - classified as Class 3-Unknown pathogenicity.

DCM

There is no significant excess of rare FHL1 Non-Truncating variants in DCM (details).

OMGL: Detected in 0 / 355 DCM patients.

The EF is the estimated proportion of rare variants of this class that will be pathogenic in a cardiomyopathy proband, a prior probability based solely on variant frequency data in cases and controls, and should be further refined by additional evidence such as family segregation data, known association with disease, population frequency, protein domain analysis, functional studies and in silico algorithms to assess the significance of a variant.

For more information on the clinical significance of this variant, please see the ClinVar entry.

Detection in Population Databases

This variant has not been detected in the ExAC Aggregation Consortium (ExAC) database (>60,000 samples), the 1000 Genomes (1KG) database (2,500 samples) or the Exome Sequencing Project (ESP) database (6,500 samples).

The Exome Aggregation Consortium (ExAC) is a database of 60,706 unrelated individuals sequenced as part of various disease-specific and population genetic studies. There is partial overlap between ExAC and 1000 Genomes (1KG) (1,851 of the 2,504 samples in 1KG) and the Exome Sequencing Project (ESP) (3,936 of the 6,500 samples in ESP).

Other Variant & Gene Details

Canonical Sequences
Transcript	ENST00000370690		NM_001449.4
Protein	ENSP00000359724

Missense Variant Predictions
SIFT	Grantham	Polyphen-DIV	Polyphen-VAR	Summary 87.5% of algorithms have predicted that this variant will adversely affect protein function
damaging	moderately radical		possibly damaging
LRT	MutationTaster	MutationAssessor	FATHMM
deleterious	disease-causing	medium impact	damaging

References

1. Roddy Walsh, Kate L. Thomson, James S. Ware, Birgit H. Funke, Jessica Woodley, Karen J. McGuire, Francesco Mazzarotto, Edward Blair, Anneke Seller, Jenny C. Taylor, Eric V. Minikel, Exome Aggregation Consortium, Daniel G. MacArthur, Martin Farrall, Stuart A. Cook and Hugh Watkins. Reassessment of Mendelian gene pathogenicity using 7,855 cardiomyopathy cases and 60,706 reference samples. Genet Med. 2016 doi:10.1038/gim.2016.90.

2. Pugh TJ, Kelly MA, Gowrisankar S, Hynes E, Seidman MA, Baxter SM, Bowser M, Harrison B, Aaron D, Mahanta LM, Lakdawala NK, McDermott G, White ET, Rehm HL, Lebo M, Funke BH. The landscape of genetic variation in dilated cardiomyopathy as surveyed by clinical DNA sequencing. Genet Med. 2014 Aug;16(8):601-8.

3. Alfares AA, Kelly MA, McDermott G, Funke BH, Lebo MS, Baxter SB, Shen J, McLaughlin HM, Clark EH, Babb LJ, Cox SW, DePalma SR, Ho CY, Seidman JG, Seidman CE, Rehm HL. Results of clinical genetic testing of 2,912 probands with hypertrophic cardiomyopathy: expanded panels offer limited additional sensitivity. Genet Med. 2015 Nov;17(11):880-8.