10-101770490-AGCCCTTGCGGGGCCG-AGCCCTTGCGGGGCCGGCCCTTGCGGGGCCG

Variant names:

• chr10-101770490-A-AGCCCTTGCGGGGCCG
• rs1554834321
• NM_033163.5:c.559_573dupCGGCCCCGCAAGGGC

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM4

The NM_033163.5(FGF8):​c.559_573dupCGGCCCCGCAAGGGC​(p.Gly191_Ser192insArgProArgLysGly) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FGF8 NM_033163.5 conservative_inframe_insertion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.27
• Publications: 0 publications found

Genes affected

FGF8 (HGNC:3686): (fibroblast growth factor 8) The protein encoded by this gene is a member of the fibroblast growth factor (FGF) family. FGF family members possess broad mitogenic and cell survival activities, and are involved in a variety of biological processes, including embryonic development, cell growth, morphogenesis, tissue repair, tumor growth and invasion. This protein is known to be a factor that supports androgen and anchorage independent growth of mammary tumor cells. Overexpression of this gene has been shown to increase tumor growth and angiogensis. The adult expression of this gene is restricted to testes and ovaries. Temporal and spatial pattern of this gene expression suggests its function as an embryonic epithelial factor. Studies of the mouse and chick homologs revealed roles in midbrain and limb development, organogenesis, embryo gastrulation and left-right axis determination. The alternative splicing of this gene results in four transcript variants. [provided by RefSeq, Jul 2008]

FGF8 Gene-Disease associations (from GenCC):

• hypogonadotropic hypogonadism 6 with or without anosmia

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• congenital heart disease

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• hypogonadotropic hypogonadism

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Kallmann syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• holoprosencephaly

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000308881 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM4: Nonframeshift variant in NON repetitive region in NM_033163.5.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033163.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGF8	NM_033163.5	MANE Select	c.559_573dupCGGCCCCGCAAGGGC	p.Gly191_Ser192insArgProArgLysGly	conservative_inframe_insertion	Exon 6 of 6	NP_149353.1	P55075-4
	FGF8	NM_033164.4		c.526_540dupCGGCCCCGCAAGGGC	p.Gly180_Ser181insArgProArgLysGly	conservative_inframe_insertion	Exon 6 of 6	NP_149354.1	P55075-1
	FGF8	NM_006119.6		c.472_486dupCGGCCCCGCAAGGGC	p.Gly162_Ser163insArgProArgLysGly	conservative_inframe_insertion	Exon 5 of 5	NP_006110.1	P55075-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGF8	ENST00000320185.7	TSL:1 MANE Select	c.559_573dupCGGCCCCGCAAGGGC	p.Gly191_Ser192insArgProArgLysGly	conservative_inframe_insertion	Exon 6 of 6	ENSP00000321797.2	P55075-4
	FGF8	ENST00000344255.8	TSL:1	c.526_540dupCGGCCCCGCAAGGGC	p.Gly180_Ser181insArgProArgLysGly	conservative_inframe_insertion	Exon 6 of 6	ENSP00000340039.3	P55075-1
	FGF8	ENST00000347978.2	TSL:1	c.472_486dupCGGCCCCGCAAGGGC	p.Gly162_Ser163insArgProArgLysGly	conservative_inframe_insertion	Exon 5 of 5	ENSP00000321945.2	P55075-3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1554834321; hg19: chr10-103530247;